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1Author    Klaus-Jürgen Range, Franz Rau, Ulrich KlementRequires cookie*
 Title    Hochdrucksynthese und Strukturverfeinerung von S r V 0 3, Sr2V 0 4 und Sr3V20 7 High-Pressure Synthesis and Structure Refinement of S rV 03, Sr2V 0 4, and Sr3V20 7  
 Abstract    Single crystals o f S rV 0 3, Sr2V 0 4 and Sr3V20 7 have been obtained by high-pressure reactions in a m odified belt-type apparatus. The crystal structures, refined from diffractometer data, are as follows; S rV 03, perovskite type. Pm 3m, a = 3.8408(3) A, R = 0.017, /?w = 0.018, com posi­ tion from occupancy refinement o f oxygen positions SrV O ,93(2); Sr2V 0 4, K 2N iF 4 type, I 4/m m m , a = 3.837(1), c = 12.569(1) Ä, R = 0.014, R w = 0.017; Sr3V ,0 7, Sr3T i,0 7 type, I 4/m m m , a = 3.839(1), c = 20.262(2) Ä, R = 0.020, R w = 0.029. 
  Reference    Z. Naturforsch. 46b, 1315—1318 (1991); eingegangen am 10. Mai 1991 
  Published    1991 
  Keywords    Strontium Vanadium(IV) Oxides, High-Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1315.pdf 
 Identifier    ZNB-1991-46b-1315 
 Volume    46 
2Author    Klaus-Jürgen Range, Alexandra AtzesdorferRequires cookie*
 Title    Ein Orthoperrhenat mit flächenverknüpften R e 0 6-0ktaedern: Hochdrucksynthese und Kristallstruktur von K3NaRe20 9 An Orthoperrhenate with Face-Sharing R e 0 6 Octahedra: High-Pressure Synthesis and Crystal Structure of K 3N aR e20 9  
 Abstract    The title com pound was prepared by high-pres­ sure reaction of rhenium metal with technical grade (i.e., N a containing) K O , in a modified Belt-type apparatus (20 kbar, 1Ö00 °C, 60 min, Au capsule). The amber-coloured crystals are very hygroscopic and decompose rapidly when exposed to air. K 3N aR e20 9 crystallizes hexago-nally, space group P 63/mmc, with a = 6.012(1), c = 14.342(14)Ä, c/a = 2.386 and Z = 2. The structure was refined to R = 0.031, R w = 0.023 for 422 independent, absorption-corrected reflections with l> a (I). K 3N aR e20 9 is isostructural with 6 H -B a T i0 3, a perowskite variant, and contains Na and Re in octaedral coordination. Two R e 0 6 octahedra are face-sharing, thus creating a Re20 9 double octahedron with a R e -R e distance of 2.92Ä. 
  Reference    Z. Naturforsch. 48b, 237—239 (1993); eingegangen am 30. September 1992 
  Published    1993 
  Keywords    Tripotassium Sodium D iorthoperrhenate, High-Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0237_n.pdf 
 Identifier    ZNB-1993-48b-0237_n 
 Volume    48 
3Author    Z. NaturforschRequires cookie*
 Title    Gold-Alkalimetallsysteme, III. Hochdrucksynthese und Kristallstruktur von Rb3Au7 [1]  
 Abstract    G old-A lkali M etal-System s, III. H igh Pressure Synthesis and C rystal S tructure o f R b 3A u 7 [1] K laus-Jürgen Range*, G eorg H. G rosch, F ran z R au, U lrich K lem ent The intermetallic compound Rb3Au7 could be synthesized from the elements at 4 kbar, 700 °C in a modified Belt-type apparatus. The structure (Cmmm; a = 5.579(1), b = 13.267(5), c = 7.265(2) Ä; Z = 2; R = 0.035, Rw = 0,031) comprises three crystallographically independ­ ent Au atoms, arranged in layers along the c-axis. The shortest interatomic distances are A u -A u = 2.633Ä, A u -R b = 3.438Ä and R b -R b = 3.622Ä. Im System R ubidium -G old [2,3] sind bisher n u r die V erbindungen R b A u [4] und R b A u 5 [5,6] ein­ deutig nachgewiesen und strukturell c h a ra k te ri­ siert w orden. Die Existenz von R b A u 2 [2,3,7] ko n n te bisher nicht verifiziert werden. D ie h o m o ­ logen V erbindungen N aA u 2 [8] und K A u 2 [9] sind Lavesphasen und kristallisieren im kubischen M gC u2-Typ bzw. im hexagonalen M g Z n 2-Typ. Bei unseren V ersuchen zur H ochdrucksynthese einer L avesphase R b A u 2 fanden wir nun eine bisher im System R b -A u unbekannte Phase d er Z u sam ­ m ensetzung R b 3A u 7, über die im folgenden berich­ tet w ird. 
  Reference    (Z. Naturforsch. 49b, 27—30 [1994]; eingegangen am 6. Juli 1993) 
  Published    1994 
  Keywords    Trirubidium Heptagold, High Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0027.pdf 
 Identifier    ZNB-1994-49b-0027 
 Volume    49 
4Author    Srb^sioogThomas Berger, Klaus-Jürgen RangeRequires cookie*
 Title    Hochdrucksynthese und Strukturverfeinerung von Strontium-Danburit, SrB2Si20 8 High-Pressure Synthesis and Structure Refinement of Strontium Danburite  
 Abstract    of strontium danburite, SrB2Si20 8, were found after high-pressure treatment of SrSi03/Si02/Al20 3 mixtures at 40 kbar and 1400°C, obviously formed by an unwanted side reaction with the boron oxide-containing boron nitride capsules used. The crystals are orthorhombic, space group Pnma, with a = 8.1891 (5), b = 7.9311 (6), c = 8.9284(5) A and Z = 4. The structure was refined to R = 0.031, Rw = 0.028 for 590 independent, absorption-corrected reflections. SrB2Si20 8 is isostructural with danburite (CaB2Si20 8). The structure comprises a tetrahedral framework of ordered B20 7 and Si2Ov groups which contains Sr in irregular coordination. Die Kristallstruktur des seit 1839 bekannten Dan-burits, CaB2Si20 8, wurde 1931 von Dunbar und Machatschki [1] bestimmt und später von Johann-son [2], Bakakin, Kravchenko und Belov [3] sowie von Phillips, Gibbs und Ribbe [4] verfeinert. Ob­ wohl Dunbar und Machatschki die Positionen der Boratome nur ungenau festlegen konnten, haben sie das Grundprinzip der Danburitstruktur korrekt be­ schrieben; es liegt ein dreidimensionales Netzwerk aus geordnet verteilten, eckenverknüpften B20 7-und Si20 7-Gruppen vor, das die Ca-Atome in irre­ gulärer Koordination durch Sauerstoff enthält. Eine 1'B-NMR-Studie von Brun und Ghose [5] belegt, daß die geordnete B-Si-Verteilung in Danburit bis zu dessen Zersetzungstemperatur erhalten bleibt. Während also CaB2Si2Ö 8 strukturell gut charak­ terisiert ist, lagen von der homologen Verbindung SrB2Si20 8 bisher nur Pulverdaten vor. SrB->Sio08 wurde erstmals von Verstegen et al. erwähnt, die die Lumineszenz der Eu-aktivierten Verbindung un­ tersuchten [6]. Auf sie geht auch die Bestimmung der Zellparameter zurück. Aufgrund der vermute­ ten Ähnlichkeit zum Danburit schlugen Verstegen et al. [6] für SrB2Si2Og den Namen Strontium-Dan-burit vor. Eine weitere Erwähnung der Verbindung SrB2Si20 8 erfolgt bei Baylor und Brown [7], die Phasengleichgewichte im ternären System SiCX-B20 3-Sr0 untersuchten. * Sonderdruckanforderungen an Prof. Dr. K.-J. Range. 
  Reference    Z. Naturforsch. 51b, 172—174 (1996); eingegangen am 20. Juli 1995 
  Published    1996 
  Keywords    Stontium Danburite, High-Pressure Synthesis, Crystal Structure Single crystals 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0172.pdf 
 Identifier    ZNB-1996-51b-0172 
 Volume    51 
5Author    Requires cookie*
 Title     
 Abstract    ig h P re ssu re S y n th esis a n d S in g le-C ry stal S tru c tu re R e fin e m e n t o f C alciu m A u ra te (I II) , C a A u 20 4 A n ja L o u zik o v a, K la u s-Jü rg e Single crystals of calcium aurate(III), CaAu20 4, were obtained by high-pressure treatment of a C a0/A u20 3/K 0 2 mixture at 40 kbar, 1200 °C in a modified Belt-type apparatus. The crystals are tetragonal, space group 14j/a, with a = 5.9868(7), c = 10.043(1) A, c/a = 1.678 and Z = 4. CaAu20 4 is isostructural with LaPd20 4, SrAu20 4 and BaAu20 4. Its structure comprises square-planar A u 0 4 groups (< A u -0 > = 2.007 A), which are stacked into columns along [100] and [010], These columns are connected by shared corners forming a three-dimensional framework. The Ca ions are situated in tunnels created by the gold-oxygen partial structure. They are surroun­ ded by eight oxygen atoms (< C a -0 > = 2.490 A) in a slightly distorted dodecahedron. 
  Reference    Z. Naturforsch. 51b, 747—750 (1996); eingegangen am 14. November 1995 
  Published    1996 
  Keywords    Calcium Aurate(III), High-Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0747_n.pdf 
 Identifier    ZNB-1996-51b-0747_n 
 Volume    51 
6Author    Z. NaturforschRequires cookie*
 Title    Zwei Metasilicate mit Vierer-Einfach-Ketten: Hochdrucksynthese und Strukturverfeinerung von Sr2(VO)2 Si4O i2 (Haradait) und Sr2(Ti0)2Si40 12  
 Abstract    Two M etasilicates w ith Vierer Single Chains: H igh-Pressure Synthesis and Structure R efinem ent o f Sr-,(V 0)2Si40 12 (H aradaite) and Sr2(TiO)2Si4O i2 Thom as Berger, K laus-Jürgen Range* Single crystals o f Sr2(V 0)2Si40 |2 could be obtained by high-pressure high-temperature reaction of a SrSiCVSiÖ 2/V 205 mixture in a modified Belt-type apparatus. The green crystals 
  Reference    Z. Naturforsch. 51b, 1099—1103 (1996); eingegangen am 1. März 1996 
  Published    1996 
  Keywords    Metasilicates, Vierer Single Chains, High-Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1099.pdf 
 Identifier    ZNB-1996-51b-1099 
 Volume    51 
7Author    Alexandra Atzesdorfer, Klaus-Jürgen RangeRequires cookie*
 Title    Sodium Metaperrhenate, N aR e04: High Pressure Synthesis of Single Crystals and Structure Refinement  
 Abstract    Single crystals of sodium metaperrhenate, N a R e 0 4, have been obtained by oxidation of rhe­ nium metal with sodium nitrate under high pres­ sure-high temperature conditions (m odified Belt-type apparatus, 4 kbar, 400 °C, Au-capsules). The crystals are tetragonal, space group 14^0, with a = 5.3654(4), c = 11.732(2) A and Z = 4. The struc­ ture was refined to R -0.026, Rw = 0.013 for 382 unique, absorption-corrected reflections. The scheelite-type structure for N a R e 0 4, pro­ posed by Beintema in 1937, could be confirmed. It consists of isolated R e 0 4 tetrahedra (R e -O = 1.728(2) A), connected by N aO s dodecahedra (< N a -0 > = 2.582(2) Ä). 
  Reference    Z. Naturforsch. 50b, 1417—1418 (1995); received April 24 1995 
  Published    1995 
  Keywords    Sodium Metaperrhenate, Single Crystals, High Pressure Synthesis, Structure Refinem ent 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1417_n.pdf 
 Identifier    ZNB-1995-50b-1417_n 
 Volume    50 
8Author    M. Steiner, A. Artina, Klaus-Jürgen Ndratschke, RangeRequires cookie*
 Title    C laudia  
 Abstract    Single crystals of Nd4Au20 9 and Gd4Au20 9 have been prepared by oxidizing mixtures of gold metal and Nd20 3 or Gd20 3, rsp., with K 0 2 under high-pressure high-temperature conditions (40 kbar, 1200°C) in a modified Belt-type apparatus. The X-ray structure analyses have been carried out on twinned crystals. The compounds crystallize in the orthorhombic space group Pbcn (Nd4A u ,0 9: a = 11.938(7) , b = 6.126(2),c = 11.928(3) A ,Z = 4,/?1 = 0.0443; Gd4A u ,0 9: a = 11.922(2), 6 = 6.1242(7), c = 11.917(2) A, Z = 4. R\ =0.0232). The title compounds are isostructural with La4Au20 9. Their structure comprises isolated square-planar A u04 groups, stacked along [010] to form a columnar structure. The Au-Au distance along the columnar direction is 3.10 A. Structural relations to Bi2C u04 und (Nd, Pr)2A u05 are discussed. Hochdrucksynthese und K ristallstruktur von Nd4Au2 C>9 und Gd4Au2 C>9 
  Reference    Z. Naturforsch. 51b, 811—816 (1996); eingegangen am 1. Dezember 1995 
  Published    1996 
  Keywords    Lanthanoide Aurates(III), High-Pressure Synthesis, Crystal Structure, Columnar Stacking 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0811.pdf 
 Identifier    ZNB-1996-51b-0811 
 Volume    51