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1Author    Piercarlo Mustarelli, Corrado Tomasi, Marco Villa, C.S T E, -CN R AndRequires cookie*
 Title    Heat Capacities of Thermally Treated Na 2 0-3B 2 0 3 Glasses Above and Below T g  
 Abstract    Various contributions have been obtained from the heat capacities of "as quenched" and annealed Na 2 0-3 B 2 0 3 glasses. It is shown that the enthalpic release gives a major contribution to the DSC curves obtained by reheating quenched glasses. Different relaxation processes are followed by comparing DSC scans of quenched and annealed samples in the vitreous state and around the glass transition temperature, 7^. As a function of the annealing time at T = T g — 30 "C, the specific heats at room temperature initially increase, due to the decrease of the exothermic contribution from quenched-in defects, which are absent in a fully annealed glass; over a month-long time scale these heat capacities drop, due to a partial ordering, which decreases the configurational contribution. Such a decrease is related with the "overshoot" which occurs above and which attains a limiting value AH g s 14 J moP 1 in a matter of days. The heat capacities above T g relax towards a value of C P of = 2.3 J mol" 1 K~ 1 after a few days of annealing, which is intermediate between the anomalously low C P (~ 1.8 J mol" 1 K _1) of a fast quenched (~10 3 Kmin _1) and that (~2.9J mol" 1 K" 1) of a sample annealed for one hour. These phenomena point to complex relationships among enthalpic relaxation, entropic relaxation and temperature in these glasses. 
  Reference    Z. Naturforsch. 51a, 187—191 (1996); received January 11 1996 
  Published    1996 
  Keywords    Glasses, borates, structural relaxation, annealing 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0187.pdf 
 Identifier    ZNA-1996-51a-0187 
 Volume    51 
2Author    PhilipJ. Bray, GaryL. PetersenRequires cookie*
 Title    NMR and NQR Studies of Borate Glasses  
 Abstract    Nuclear magnetic resonance (NMR) has been used for some 40 years to study atomic arrange-ments, chemical bonding, and structural groupings in borate glasses and crystalline compounds, and nuclear quadrupole resonance (NQR) has more recently increased the resolution and accuracy of the measurements. Examples are presented of the use of first-order and second-order quadrupo-lar effects in "B NMR spectra to obtain structural information, and n B and 10 B NQR spectra to obtain the quadrupolar parameters Q cc (the coupling constant) and 77 (the asymmetry parameter) with accuracies of 5 or 6 significant figures, and 3 figures, respectively. Q cc and 77 are extremely sensitive to changes in atomic rearrangements and chemical bonds, so they are excellent monitors and provide identification of bonding configurations and structural groupings in borates: Examples are also presented in which combinations of NMR and NQR data are used to extract the desired information. NQR detection of resonances at frequencies as low as 276 kHz is discussed. 
  Reference    Z. Naturforsch. 53a, 273—284 (1998); received December 30 1997 
  Published    1998 
  Keywords    NMR, NQR, Borates, Quadrupolar Interactions 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0273.pdf 
 Identifier    ZNA-1998-53a-0273 
 Volume    53 
3Author    Silke Busche, K. Arsten BluhmRequires cookie*
 Title    Synthese und Kristallstruktur von Dibariumzink-bis(cyclotriborat) Ba2Zn(B30 6)2  
 Abstract    Single crystals of the new compound Ba2Zn(B30 6)2 were obtained by using a B20 3 flux technique. They crystallize in an as yet unknown structure type. X-ray investigations led to space group Cj'-Pl (Nr.2) with lattice parameters a = 715.5(2), b = 720.5(2), c = 1178.9(4), a = 78.96(2)°, /3 = 85.45(2)°, j = 60.12(1)°, Z = 2. The structure is characterized by iso­ lated (B30 6)3_-rings and contains two ninefold coordinated Ba-sites. Zn2+ is tetrahedrally coordinated by oxygen. The relation to the crystal structures of high-temperature BaB20 4 and Ba2Ca(B30 6)2 is discussed. 
  Reference    Z. Naturforsch. 51b, 309—312 (1996); eingegangen am 26. September 1995 
  Published    1996 
  Keywords    Barium, Zinc, Borate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0309.pdf 
 Identifier    ZNB-1996-51b-0309 
 Volume    51 
4Author    M. Onoheteroarylborates [, Norbert Kuhn3, Heike Kotowski3, Dieter Bläserb, Roland BoesebRequires cookie*
 Title    Monoheteroarylborate [1]  
 Abstract    The heteroaryl borates Li[C4Me4NBH3] (6) and Na[C3H 3N2(BMe3)2]* 2 C4HgO (8) are ob­ tained by treatment of Li[C4Me4N] and Na[C3H3N2] with Me2S • BH3 and BMe3, respectively. The X-ray structure of [Na(C4H 80) 6][C3H 3N 2(BM e3)2] (10) is reported. 
  Reference    Z. Naturforsch. 52b, 351—354 (1997); eingegangen am 28. Oktober 1996 
  Published    1997 
  Keywords    Borates, Pyrroles, Imidazoles, X-Ray 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0351.pdf 
 Identifier    ZNB-1997-52b-0351 
 Volume    52 
5Author    Giorgio Concas, Giorgio Spano, Marzia Carrada, Marco Bettinelli, Adolfo SpeghiniRequires cookie*
 Title    Local Structure of Europium Sites in Oxide Glasses by Nuclear Gamma Resonance  
 Abstract    The symmetry and disorder of the Eu 3+ site was investigated in some phosphate and borate glasses by means of 151 Eu Mössbauer spectroscopy. The quadrupole interaction parameter, which is due to the distortion of the Eu site compared to a cubic symmetry, has been measured together with the asymmetry parameter, which points out the absence of a threefold or fourfold axis of symmetry at the rare earth site. The correlation of the isomer shift with the optical basicity of the glass indicates a covalent component with 6s character in the Eu-0 bond. The axial component of the electric field gradient at the Eu site is also correlated with the optical basicity. 
  Reference    Z. Naturforsch. 54a, 539—544 (1999); received August 5 1999 
  Published    1999 
  Keywords    Europium, Oxide Glasses, Phosphates, Borates, 15 'Eu Mössbauer Spectroscopy 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0539.pdf 
 Identifier    ZNA-1999-54a-0539 
 Volume    54 
6Author    Ralf Janda, Gert HellerRequires cookie*
 Title    1 B—NMR-spektroskopische Untersuchungen an wäßrigen Polyboratlösungen n B NMR Spectroscopic Studies on Aqueous Polyborate Solutions  
 Abstract    The U B nuclear magnetic resonance spectra of sodium, potassium and ammonium polyborates in aqueous solutions, -as a function of concentration and pH -, provide information of the hydrolysis equilibria. Two n B NMR lines are observed in aqueous solutions of Na[B506(0H)4], K[B506(0H)4] and NH4[B506(0H)4]. Only one n B NMR line is recorded in aqueous solutions of (NH4)2[B4Os(OH)4] and Na2[B4Os(OH)4]. The results of the U B NMR spectra are discussed and compared with the results obtained from Raman studies of aqueous polyborate solutions. 
  Reference    Z. Naturforsch. 34b, 1078—1083 (1979); eingegangen am 13. März/27. April 1979 
  Published    1979 
  Keywords    n B NMR, Borates, Polyborates, Hydrolysis, Equilibria 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1078.pdf 
 Identifier    ZNB-1979-34b-1078 
 Volume    34 
7Author    JanKarsten Schaefer, BluhmRequires cookie*
 Title     
 Abstract    uT m 2[ B 20 5] 2: D as erste "M etaborat" mit einem x [ B 20 5] 4 -Anion CuTm2[B20 5]2: The First " Metaborate" with a ^ [ B ^ s ] 4 -Anion Single crystals o f the compound CuTm2[B 20 3]2 were obtained by a B20 3 flux technique. The compound contains a hitherto unknown metaborate anion with the formula ^ [ ^ O s ] 4-. It crystallizes in the monoclinic space group C|h-P2!/c with a = 452.18(7); b = 720.0(2); c = 929.2(5) pm; ß -90.16(5)°; Z = 2. The metaborate layers consists of four and eight membered rings of edge-sharing B 0 4-tetrahedra resembling the complex anion in the isotypic gadolinite structure of F e Y 2[B eS i0 3]2. The layers are connected via copper-centered elongated oxygen octahedra and slightly distorted thulium-centered tetragonal oxygen antiprisms. 
  Reference    Z. Naturforsch. 50b, 630—634 (1995); eingegangen am 2. August/11. November 1994 
  Published    1995 
  Keywords    Copper, Thulium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0630.pdf 
 Identifier    ZNB-1995-50b-0630 
 Volume    50 
8Author    J. Schaefer, K. BluhmRequires cookie*
 Title    Synthese und Kristallstruktur von CuLn2[B20 5]2 (Ln = Er3*, Lu3+): zwei Kupferlanthanoidborate m it^ [B 20 5 ]4_-A nionen Synthesis and Crystal Structure of CuLn2[B20 5]2 (Ln = E r3+, Lu3+): Two Copper Lanthanoid B orates with 2.[B20 5]4~-Anions  
 Abstract    Single crystals of the new com pounds CuLn2[B20 5]2 (Ln = Er3+(I), Lu3+(II)) were ob­ tained by a B9O 3 flux-technique. They crystallize in the space group C ih -P 2 \lc with I: a = 453.14(6); b = 721.94(5); c = 929.5(4) pm; ß = 90.01(3)°; Z = 2 und II: a = 451.4(4); b = 718.3(1); c = 928.1(3) pm; ß = 90.00(6)°; Z = 2. The compounds are isotypic to CuTm2[B20 5 ] 2 as well as to the mineral Gadolinite (FeY 2 [B eSi0 5 ]2) and exhibit layer like 2.[B20 5]4 --anions consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The borate anions are separated by layers of elongated C u 0 6-octahedra and slightly distorted tetragonal L n 0 8-antiprisms. 
  Reference    Z. Naturforsch. 50b, 1141—1145 (1995); eingegangen am 19. Januar 1995 
  Published    1995 
  Keywords    Copper, Erbium, Lutetium, Borate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1141.pdf 
 Identifier    ZNB-1995-50b-1141 
 Volume    50 
9Author    Park, K. Arsten BluhmRequires cookie*
 Title    Pb6(A s0 4)  
 Abstract    [B (A s04)4] -ein neuartiger Kristallstrukturtyp im System Pb0 /B2 0 3 /As2 0 5 mit einem Beitrag über P b(B A s05) Pb6(A s 0 4)[B (A s 0 4)4] -a New Crystal Structure Type in the System P b 0 /B 20 3/A s20 3 w ith R em arks about P b (B A s0 5) C heong- Single crystals of Pb6(A s04)[B(As04)4] (I) and Pb(BAs05) (II) were obtained by melting B->03, As20 5 and PbO at 800 °C. X-ray investigation led to the space group (I): S4 -P4 (Nr. 81) with a = 715.4(1), c = 976.2(3) pm, Z = 1 and (II): C | -P3, (Nr. 144) with a = 712.2(1), c = 693.5(2) pm, Z = 3. While (II) is isotypic to the Stillwellite structure, Pb^(As04)[B(As04)4] represents a completely novel type of crystal structure. Boron and arsenic are tetrahedrally coordinated by oxygen. These polyhedra form two kinds of isolated anions: A s04'~ and B(A s04)49_. Lead is eightfold coordinated by oxygen. 
  Reference    Z. Naturforsch. 51b, 313—318 (1996); eingegangen am 16. Oktober 1995 
  Published    1996 
  Keywords    Lead, Arsenic, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0313.pdf 
 Identifier    ZNB-1996-51b-0313 
 Volume    51 
10Author    Silke Busche, K. Arsten BluhmRequires cookie*
 Title    Ba2KZn3(B306)(B60 13)  
 Abstract    Single crystals of the new compound Ba2KZn3(B30 6)(B60 | 3) were obtained by using a B20 3 flux technique; they crystallize in an as yet unknown structure type. X-ray investigations led to the space group C '-P l (Nr.2) with lattice parameters a = 705.2(2), b = 712.5(2), c = 1880.3(6), a = 93.43(3)°, ß = 90.72(2)°, 7 = 119.57(2)°, Z = 2. The structure contains (B30 6)3~-rings and a new discrete (B60 13)8~ anion, which is composed of two B 0 4 and two B20 5 units. Zn-+ is tetrahedrally coordinated by oxygen and two out of three tenfold coordinated Ba-sites are statistically occupied by Ba2+ and K+. 
  Reference    Z. Naturforsch. 51b, 319—324 (1996); eingegangen am 26. September 1995 
  Published    1996 
  Keywords    Barium, Potassium, Zinc, Borate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0319.pdf 
 Identifier    ZNB-1996-51b-0319 
 Volume    51 
11Author    Silke Busche, Karsten BluhmRequires cookie*
 Title    Synthese und Kristallstruktur von Lanthanoidzinkboraten L n Z n ^ O jo) mit Ln = Ce, Nd, Tb Synthesis and Crystal Structure o f Rare Earth Zinc Borates LnZn(B5O ]0) with Ln = Ce, Nd, Tb  
 Abstract    Single crystals o f the new compounds LnZn(B5O |0) (Ln = (A) C e3+, (B) N d3+, (C) T b '+) were obtained by using a B 20 3 flux technique. X-ray investigations led to space group C2h-P 2,/n (Nr. 14) with lattice parameters: (A) a = 874.5(1), b = 761.4(1), c = 950.0(1), ß = 92.80(1)°, (B) a = 868.6(2), b = 760.9(2), c = 946.0(2), 0 = 92.9 9 (2)°, (C) a = 858.2(2), b = 760.5(2), c = 939.3(2), ß = 93.56(2)°, Z = 4. The structure is isotypic with C oSm (B 5 O |0) and is characte­ rized by two-dimensional infinite 2 (B 5 O 10)5_ ions. Ln is tenfold coordinated by oxygen, and Zn2+ occupies distorted Z n 0 6 polyfiedra. 
  Reference    Z. Naturforsch. 51b, 671—6 (1996); eingegangen am 26. Oktober 1995 
  Published    1996 
  Keywords    Rare Earth, Zinc, Borate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0671.pdf 
 Identifier    ZNB-1996-51b-0671 
 Volume    51 
12Author    Karsten Bluhm, Andre WieschRequires cookie*
 Title    Synthese und Kristallstruktur von NiHo2(B20 5)2, das erste Nickellanthanoidborat mit einem ^ (B 20 5)4"-Anion Synthesis and Crystal Structure of NiHo2(B20 5)2, the First Nickel Lanthanoid Borates with a (^ (B 20 5)4" A nion  
 Abstract    Single crystals o f N iH o2(B20 5) 2 were prepared by a B20 3 flux-technique in high temperature reactions at 1450 °C and investigated by X-ray diffraction. They crystallize in the space group C 2h-P 2 ,/c (Nr. 14) with a = 451.0(4); b = 724.8(3); c = 938.8(6) pm; ß = 9 1 ,39(1)°; Z = 2. The compound is isotypic to CuTb2(B20 5) 2 as well as to the gadolinite structure (F eY 2 (B e S i0 5)2) and contains a two dimensional infinite anion with the formula 2 (B 2 0 5)4~. The borate layers consist o f four-and eight-membered rings o f edge-sharing B 0 4 tetrahedra. The layers are connected via copper-centered elongated oxygen-octahedra and slightly distorted tetragonal H o 0 8 antiprisms. 
  Reference    Z. Naturforsch. 51b, 677 (1996); eingegangen am 9. November 1995 
  Published    1996 
  Keywords    N ickel, Holmium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0677.pdf 
 Identifier    ZNB-1996-51b-0677 
 Volume    51 
13Author    Cheong-HwaKarsten Park, BluhmRequires cookie*
 Title    Zur Synthese und Kristallstruktur von Bariumboroarsenat Ba(BAs05) mit einem Beitrag über Bariumorthoarsenat Ba3(As04)2 Synthesis and Crystal Structure of Barium Boroarsenate B a(B A s05) with a Contribution on Barium Orthoarsenate Ba3(A s0 4)2  
 Abstract    Single crystals of Ba(BAs05) (I) and Ba3(As04)2 (II) were obtained by melting B20 3, arsenic pentoxide and BaO at 1100°C. Both compounds crystallize trigonally, space groups (I): C3 -P3t (Nr. 144), (II): D3d -R3m (Nr. 166), with the lattice parameters (I): a = 726.7(1), c = 710.6(1) pm, Z = 3 and (II): a = 576.7(1), c = 2116.3(2) pm, Z = 3. Ba(BAsOj) is isotypic to Pb(BAs05) (Stillwellite structure) and Ba3(As04)2 to Ba3(P04)2. The structure of Ba(BAs05) is characterized by helical chains of rings of two borate tetrahedra and one arsenate tetrahedron. Barium is tenfold coordinated by oxygen. A rod-like sequence of coordination polyhedra, A s04-Ba(2)O|0-Ba(1)O|2-Ba(2)O|0-AsO4 is characteristic in the crystal structure of Ba3(A s04)2. 
  Reference    Z. Naturforsch. 51b, 722—726 (1996); eingegangen am 9. November 1995 
  Published    1996 
  Keywords    Barium Arsenic, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0722.pdf 
 Identifier    ZNB-1996-51b-0722 
 Volume    51 
14Author    K. Bluhm, C. H. ParkRequires cookie*
 Title    Die Synthese und Kristallstruktur des Borat-Phosphats: a -Zn3(B0 3)(P04) Synthesis and Crystal Structure of the Borate-Phosphate: Q-Zn3(B 0 3)( P 0 4)  
 Abstract    Single crystals of the compound a -Z n 3(B 0 3)(P 0 4) were obtained at 1050 °C by using B20 3, P20 5 and Z n C 0 3 as starting materials and subsequent cooling to 600°C with 20°C/h. X-ray investigations on single crystals yield a new crystal structure in the monoclinic space group Cm -(Nr. 8) with a = 972.5(2); b = 1272.0(3); c = 487.4(3) pm; 0 = 1 1 9 .8 0 (4)°; Z = 4. The structure contains isolated trigonally planar B 0 3 and tetrahedral P 0 4 units which are not joined together. Zinc occupies three crystallographically different point positions and is trigonal-bipyramidally, tetragonal-pyramidally or distorted tetrahedrally coordinated by oxygen. 
  Reference    (Z. Naturforsch. 52b, 102—106 [1997]; eingegangen am 16. August 1996) 
  Published    1997 
  Keywords    Zinc, Borate, Phosphate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0102.pdf 
 Identifier    ZNB-1997-52b-0102 
 Volume    52 
15Author    Borate Anion, A. Wiesch, K. BluhmRequires cookie*
 Title    AgSrfByO^]: Das erste wasserfreie quaternäre Silber(I)-Borat mit vierfach koordiniertem Silberion und einem neuartigen Boratanion AgSr[B70 12]: The First Anhydrous Quaternary Silver(I)-Borate with Fourfold Coordinated Silver Ion and a New  
 Abstract    Single crystals of AgSr[B70 , 2] were obtained by using a B20 3 flux-technique and Ag2C 0 3 and SrC 03 as starting materials in a silver ampoule at 800 °C. X-ray investigations on single crystals led to the space group C 2/c with a = 664.2(5); b = 1153.6(3); c = 2198.0(6) pm; ß = 92,52(3)°; Z = 8. Ag+ is fourfold coordinated by oxygen atoms and forms distorted A g04 tetrahedra while Sr2+ has nine nearest neighbours. The compound contains a hitherto unknown two dimensional borate anion [B70 i 2]3-which contains four trigonal planar B 0 3 groups and three B 0 4 tetrahedra per unit. 
  Reference    Z. Naturforsch. 52b, 227—230 (1997); eingegangen am 9. September 1996 
  Published    1997 
  Keywords    Silver, Strontium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0227.pdf 
 Identifier    ZNB-1997-52b-0227 
 Volume    52 
16Author    Andre Wiesch3, Hauke Timmb, Karsten Bluhm3Requires cookie*
 Title    Uber CuDy2[B80 16] und CuHo2[B80 16]: Zwei neue "Metaborate" mit einem ^ [B80 16]g_-Anion On CuDy2[B80 16] and CuHo2[B80 16]: Two New "Metaborates" with a ^ [B80 16]8-Anion  
 Abstract    Nearly colourless single crystals of the compounds CuDy2 [B80 i 6] (I) and CuHo2[B80)6] (II) have been obtained by a B20 3 flux technique. They crystallize in the structure of CuTb2 [B80)6] (I) or in an orthorhombic variant (II). X-ray investigations on single crystals led to the space group C2h -P2!/c (Nr. 14) with lattice parameters a = 1025,5(10); b = 836,99(10); c = 621,2(8) pm, ß = 90.47(10)°; Z = 2 (I) and D^h -Pbam (Nr. 55) with a = 840,7(2), b = 616,6(2), c = 1022,0(2) pm, Z = 2 (II). The structures contain 1 [B80 16]8_ chains isolated from each other, which include tri-and tetracoordinated boron, T'fie chains consist of alternating twelve and eight-membered rings of boron and oxygen atoms connected by B 0 4 units. Dy,+ and H o 3+ are octacoordinated and Cu2+ is hexacoordinated in elongated octahedra by oxygen. The relation between these two structures is discussed. 
  Reference    (Z. Naturforsch. 53b, 1—4 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Lanthanoids, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0001.pdf 
 Identifier    ZNB-1998-53b-0001 
 Volume    53 
17Author    Lanthanoid Borates, A. Wiesch, K. BluhmRequires cookie*
 Title    CuHo2[B20 5]2* Ein unerwarteter Strukturtyp in der Reihe der Kupferlanthanoidborate CuHo2[B20 5]2: An Unexpected Structure Type in the Series of Copper  
 Abstract    Single crystals of the new compound CuHo2 [B20 5 ]2 were obtained by using a B20 3 flux technique with CuO and Ho20 3 at 1050 °C. X-ray investigations on single crystals led to the space group P 2,/c (Nr. 14) with lattice parameters a = 454.3(2); b = 726.0(4); c = 936.0(5) pm; ß = 90.77(1)°; Z = 2. The compound is isotypic to CuTb2[B20 5 ] 2 as well as to the gadolinite structure (FeY2 [BeSi05]2). The structure exhibits layer-like 2 [B20 5]4~, a two-dimensional anion consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The layers are connected by elongated C u06-octahedra and slightly distorted tetragonal LnOs-antiprisms. 
  Reference    (Z. Naturforsch. 53b, 5—8 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Holmium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0005.pdf 
 Identifier    ZNB-1998-53b-0005 
 Volume    53 
18Author    Helical Borate, AnionA. Wiesch, K. BluhmRequires cookie*
 Title    Ag2Cs[B1 5 0 2 4]* Ein wasserfreies quaternäres SiIber(I)-Borat mit einem neuartigen Boratanion mit helixartigem Aufbau Ag2C s[B 150 24]: An Anhydrous Quaternary Silver(I)-Borate with a New  
 Abstract    Single crystals o f Ag2C s[B ,50 24] were prepared by using a B 20 3 flux technique with Ag2C 0 3 and Cs2C 0 3 in a closed silver tube at 650 °C. X-Ray investigations led to a new crystal structure in the space group P 2 ,2 ,2 (Nr. 18) with lattice parameters a = 1778.7 (4); b = 2219.2 (4); c = 512.2 (1) pm, Z = 4. The silver atoms are part of distorted A g 0 4 tetrahedra and planar A g 0 3 units while the caesium atoms are eightfold coordinated by oxygen. The compound contains an as yet unknown borate anion [B,50 24] with twelve B 0 3-and three B 0 4 units per formula. The B 0 3 units are connected to eight cords twisted to helices which are combined via B 0 4 tetrahedra to a three dimensional framework with large tunnels occupied by the cations. 
  Reference    Z. Naturforsch. 53b, 157—160 (1998); eingegangen am 23. Oktober 1997 
  Published    1998 
  Keywords    Silver, Caesium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0157.pdf 
 Identifier    ZNB-1998-53b-0157 
 Volume    53 
19Author    Susanna Kerschl, BerndW. RackmeyerRequires cookie*
 Title    O rganoboration of Alkynylstannanes, X V III [1] Novel Fused Heterocyclic Systems from N-and C-Lithiated Azoles and ds-l,2-O rganom etallic Substituted A lkenes  
 Abstract    Organoboration o f dim ethyl(chloro)-l-propynylstannane with triethylborane gives ( 
  Reference    Z. Naturforsch. 41b, 890 (1986); eingegangen am 18. März 1986 
  Published    1986 
  Keywords    Fused H eterocycles, Borates, Zwitterionic Structures, N M R Spectra 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0890.pdf 
 Identifier    ZNB-1986-41b-0890 
 Volume    41