| 1 | Author
| Ingmar Persson, Magnus Sandström, Haruhiko Yokoyama, Monika Chaudhry, Japan | Requires cookie* | | Title
| S  | | | Abstract
| tr u c tu r e o f th e S o lv a te d S tr o n tiu m a n d B a riu m I o n s in A q u e o u s, D im e th y l S u lfo x id e a n d P y r id in e S o lu tio n , a n d C r y s ta l S tr u c tu r e o f S tr o n tiu m a n d B a r iu m H y d r o x id e O c t a h y d r a te Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday Single crystal X-ray data, collected at 298 K, are used to redetermine the crystal structure of the non-isomorphic compounds [Sr(H20)8](0H)2 and [Ba(H20)8](0H)2. The eight water oxygen atoms form distorted Archimedean antiprisms around the octahydrated metal ions with mean metal ion-oxygen distances 2.62 and 2.79 Ä for strontium and barium, respectively. A second coordination shell of 24 hydrogen-bonded oxygen atoms with mean metal ion-oxygen distances M • • • O" 4.76 and 4.80 A, respectively, is observed. The hydroxide ions in both structures have an unusual hydrogen bond arrangement with 5 bonds accepted and one donated. The structure of the solvated strontium and barium ions in aqueous, dimethyl sulfoxide and pyridine solutions has been studied by means of large angle X-ray scattering and extended X-ray absorption fine structure spectroscopy techniques. In aqueous solution independent determinations of the first-sphere metal-oxygen coordination by the two techniques resulted in the bond lengths Sr-O 2.63 (2) and Ba-O 2.81 (3) A, and for both metal ions a hydration number of 8.1 (3). The second coordination spheres are very diffuse with only about 13 water molecules at similar M • • • O" distances as in the crystal structures and 2-3 water molecules closer to the metal ions. In dimethyl sulfoxide solution both ions were found to coordinate 6.0 (5) solvent molecules with the distances Sr-O 2.54(1), Sr -S 3.77(1) A, and Ba-O 2.76(1), Ba -S 3.99(1) A. For the solvated ions in pyridine solution EXAFS measurements yielded the distances Sr-N 2.57 (2) and Ba-N 2.78 (3) A, with a probable solvation number of 6. Correlations of hydration enthalpies and partial molar volumes with experimental M-O bond distances in aqueous solution are used to discuss hydration numbers and bond character for all of the alkaline earth metal ions. | | |
Reference
| Z. Naturforsch. 50a, 21—37 (1995); received November 8 1994 | | |
Published
| 1995 | | |
Keywords
| Barium, Strontium, Hydration, Solvation, Structure | | |
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| default:Reihe_A/50/ZNA-1995-50a-0021.pdf | | | Identifier
| ZNA-1995-50a-0021 | | | Volume
| 50 | |
2 | Author
| Ch Lang | Requires cookie* | | Title
|  | | | Abstract
| Single crystals of LiBa2Cu30 6 have been pre pared by recrystallization from melts in a stream of dry Argon as well as by spontaneous CO 2-LASER heating. It crystallizes with orthorhom bic symmetry, space group -Fmmm, a = 8,219(2), b = 11,520 (2), c = 14,284(3) A, Z = 8. The crystal structure is isotypic to NaBa2Cu30 6. | | |
Reference
| Z. Naturforsch. 50b, 681—683 (1995); eingegangen am 19. September 1994 | | |
Published
| 1995 | | |
Keywords
| Lithium, Barium, Copper, Oxide | | |
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| default:Reihe_B/50/ZNB-1995-50b-0681_n.pdf | | | Identifier
| ZNB-1995-50b-0681_n | | | Volume
| 50 | |
3 | Author
| Silke Busche, K. Arsten Bluhm | Requires 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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| default:Reihe_B/51/ZNB-1996-51b-0309.pdf | | | Identifier
| ZNB-1996-51b-0309 | | | Volume
| 51 | |
4 | Author
| J. Feldmann, Hk Müller-Buschbaum | Requires cookie* | | Title
| Kristallstrukturuntersuchung am Barium-Yanadyl-Vanadat: Ba2(V 0)V 20 8 Crystal Structure Investigation of the Barium Vanadyl-Vanadate: Ba2(V 0 )V 20 8  | | | Abstract
| Single crystals of Ba2(V 0)V 20 8 have been prepared by solid state reactions of Ba2V 20 7, V 9O 1 and V ^ 05 in sealed silica tubes. This compound crystallizes with monoclinic symmetry, space group C 1 -P 2 ,, a = 8.1174(9), b = 5.9699(9), c = 9.2903(9) A , ß = 113.94(1)°, Z = 2. V 5+ shows tetrahedral coordination. V 4+ inside ^ [V (3)0 4] chains is characterized by a square pyramidal coordination with a short apical V-O distance of 1.6 A typically for vanadyl groups. Ba2(V 0)V 20 8 represents a new structure type and is not isotypic to Sr2(V 0)V 20 8. | | |
Reference
| Z. Naturforsch. 51b, 489—4 (1996); eingegangen am 22. August 1995 | | |
Published
| 1996 | | |
Keywords
| Barium, Vanadium, Oxide, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0489.pdf | | | Identifier
| ZNB-1996-51b-0489 | | | Volume
| 51 | |
5 | Author
| OctahedraC. Wadewitz, Hk Müller-Buschbaum | Requires cookie* | | Title
| Ba  | | | Abstract
| (V0)4(As0 4)2(As20 7): Ein neues Divanadyl(IV)-Arsenat mit flächenverknüpften V20 8+1-Oktaederdoppeln Ba(V0)4(As0 4)2(As20 7): A New Divanadyl(IV)-Arsenate Containing Face Shared V20 8+, Double A new alkaline earth vanadyl arsenate Ba(V0)4(As0 4)2(As2 0 7) has been synthesized by solid state reactions in closed quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D2£-Pnma, a = 17.540(2), b = 7.6223(8), c = 11.0633(12) A, Z = 4. The crystal structure is characterized by A s 0 4 single and As20 7 double tetrahedra and face shared asymmetric stretched V20 8+, double octahedra, forming a network of polyhedra. The incorporated Ba2+ ions show 12-fold coordination by oxygen. Ba(V 0)4(A s0 4)2(As20 7) is the first vanadyl compound containing V20 8 divanadyl groups originating from face sharing stretched V 0 5+l octahedra. | | |
Reference
| (Z. Naturforsch. 52b, 83—87 [1997]; eingegangen am 21. August 1996) | | |
Published
| 1997 | | |
Keywords
| Barium, Vanadyl Arsenate, Crystal Structure | | |
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| default:Reihe_B/52/ZNB-1997-52b-0083.pdf | | | Identifier
| ZNB-1997-52b-0083 | | | Volume
| 52 | |
6 | Author
| B. Wulff, Hk Wedel, Müller-Buschbaum | Requires cookie* | | Title
| Zur Kristallchemie von Telluraten mit Mn2+ im kationischen und anionischen Teil der Kristallstruktur: (Mn2?4Cuo,6)Te06, Ba2M nTe06 und Pb(Mn0,5 Te0,5 )O3 On the Crystal Chemistry of Tellurates Containing Mn2+ in the Cationic and Anionic Part of the Crystal Structure: (Mn2 4Cu0 6)Te06, Ba2MnTe06 and Pb(Mn0 5Te0 5) 0 3 L  | | | Abstract
| Single crystals of (Mn2.4Cu0 6)Te06 (I), Ba2MnTe06 (II) and Pb(Mn0 5Te0 5) 0 3 (III) have been prepared by crystallization from fluxes. X-ray investigations led to rhombohedric sym metry (I): R3, (II): R3m with the trigonal lattice constants (I): a = 8.826(1), c = 10.687(2) Ä, Z = 2. (II): a = 5.817(8), c = 14.244(3) A, Z = 3. Compound (III) crystallizes with cubic symmetry P43m, a = 4.045(3) A, Z = 1. (I) is the first example of a manganese(II) tellurate and belongs to the structure type of A3X 0 6 compounds like (Mn2In)Sb06, Mn3W 0 6 and Ca3U 0 6. (II) exemplifies an ordered and (III) a disordered variation of the perovskites. | | |
Reference
| (Z. Naturforsch. 53b, 49—52 [1998]; eingegangen am 15. Oktober 1997) | | |
Published
| 1998 | | |
Keywords
| Manganese, Copper, Lead, Barium, Tellurates | | |
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| default:Reihe_B/53/ZNB-1998-53b-0049.pdf | | | Identifier
| ZNB-1998-53b-0049 | | | Volume
| 53 | |
7 | Author
| Masahiko Matsumiya, Masatoshi Takano, Ryuzo Takagi, Reiko Fujita | Requires cookie* | | Title
| Electrochemical Behavior of Ba 2+ at Liquid Metal Cathodes in Molten Chlorides  | | | Abstract
| The electrochemcal behavior of Ba 2+ on several liquid metal electrodes (AI, Bi, Cd, Pb, Sn and Zn) in a NaCl-KCl equimolar solvent at 1000 K has been investigated by means of cyclic voltammetry and chronopotentiometry. The kinetic parameters and the diffusion coefficient for Ba 2+ were determined by cyclic voltammetry with conventional, semi-integral, semi-differential methods and chronopotentiometry. It was revealed that on a liquid Pb electrode in the NaCl-KC1 system at 1000 K the quasi-reversible cathodic reaction Ba 2+ + 2e~ + Pb —> BaPb takes place. In addition, the kinetic parameters and the diffusion coefficient agree well with the values determined by various electroanalyses. The possibility of alloy formation between Ba and Sn was also demonstrated in this paper. | | |
Reference
| Z. Naturforsch. 54a, 739—746 (1999); received September 13 1999 | | |
Published
| 1999 | | |
Keywords
| Alloy Formation Reaction, Barium, Liquid Metal Cathodes, Molten Salts | | |
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| default:Reihe_A/54/ZNA-1999-54a-0739.pdf | | | Identifier
| ZNA-1999-54a-0739 | | | Volume
| 54 | |
11 | Author
| J. Schmachtel, Hk Müller-Buschbaum | Requires cookie* | | Title
| Oxotitanate mit gemischter Valenz, III Zur Kenntnis von BaTi8016 Oxotitanates with Mixed Valence. III About BaTisOie  | | | Abstract
| The hitherto unknown compound BaTisOi6 was prepared by heating a mixture of Ba0:Ti02 = 1:4 in a vacuum furnace to 1400 °C (Ti crucible). Single crystal X-ray investigations show monoclinic symmetry (a — 1420,9, b = 297,1, c — 998,1 pm, ß = 133,50°; space group C|-C2). The crystal structure was found to be isotypic to a-Mn02. | | |
Reference
| Z. Naturforsch. 35b, 332—334 (1980); eingegangen am 14. Dezember 1979 | | |
Published
| 1980 | | |
Keywords
| Barium, Titanium, Oxide, Crystal Structure, a-Mn02-Type | | |
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| default:Reihe_B/35/ZNB-1980-35b-0332.pdf | | | Identifier
| ZNB-1980-35b-0332 | | | Volume
| 35 | |
12 | Author
| D. Chales De Beaulieu, Hk Müller-Buschbaum | Requires cookie* | | Title
| Gemischtvalente Oxovanadate, I Ein neuer Strukturtyp für die Verbindung BaV10O15 Oxovanadates with Mixed Valence, I A New Crystal Structure of BaVioOis  | | | Abstract
| BaVioOis was prepared by high temperature reaction of BaO and V2O3 in H2-atmosphere (T > 1800°). X-ray investigations of single crystals show a new structure type with octa-hedral coordination of V 3+ /V 2+ (statistical distribution) and cuboctahedral surrounding of Ba 2+ . Orthorhombic symmetry, space group D^|-Ccmb, a = 995,8; b = 1161,8; c = 941,0; Z = 4. | | |
Reference
| Z. Naturforsch. 35b, 669—671 (1980); eingegangen am 5. Februar 1980 | | |
Published
| 1980 | | |
Keywords
| Barium, Vanadium, Oxide, Mixed Valence State, Crystal Structure | | |
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| default:Reihe_B/35/ZNB-1980-35b-0669.pdf | | | Identifier
| ZNB-1980-35b-0669 | | | Volume
| 35 | |
14 | Author
| G. Tams, Hk Miiller-Buschbaum | Requires cookie* | | Title
| A Contribution to the Crystal Chemistry of Alcaline Alealine Earth Precious Metal Perovskites. Synthesis and Crystal Structure of NaBa4Cuo,5Pti,50 8  | | | Abstract
| Single crystals of the phase NaBa4Cu0 5P t1 s0 8 were prepared in closed silver tubes. The black and moisture sensitive crystals were investigated by four-circle diffractometer X-ray tech niques. They show trigonal symmetry, space group D2-P321, a = 10.0644, c = 8.3811 A, Z = 3 and belong to the perovskites. The typical M20 9 double octahedra are occupied by Pt4+ and Cu2+ in a different manner. Na+ is partly in and out of the centres of trigonal prisms of oxygen. These features will be discussed with respect | | |
Reference
| Z. Naturforsch. 49b, 585—588 (1994); eingegangen am 12. Januar 1994 | | |
Published
| 1994 | | |
Keywords
| Sodium, Barium, Copper, Platinum, Crystal Structure | | |
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| default:Reihe_B/49/ZNB-1994-49b-0585.pdf | | | Identifier
| ZNB-1994-49b-0585 | | | Volume
| 49 | |
15 | Author
| S. Möhr, Hk Müller-Buschbaum | Requires cookie* | | Title
| Ein gemischtvalentes Oxometallat mit Cr3+ anstelle von Ti3+: Ba2Ti4+Cr20 13  | | | Abstract
| Single crystals of Ba2Ti4+C r20 13 w ere p rep a red by C 0 2-L A S E R h igh te m p era tu re r ea ctio n s and in v estig a te d by X -ra y w o rk . T h e c o m p o u n d c ry sta llize s w ith m o n o c li nic sym m etry, a = 15.0 1 8 5 , b = 3 .9 4 1 9 , c -9 .0 7 6 4 Ä , ß = 9 8 .1 3 7 °, Z = 2. B a 2T i4Cr20 13 is iso ty p ic to N a 2T i60 13. T h e crystal stru ctu re is d isc u sse d w ith r e sp e ct to o rd ered or d iso rd ered d istrib u tio n s o f T i4+ and C r3+ u sin g c a lc u la tio n s o f C o u lo m b term s o f la ttice energy. It is sh o w n , th at th e sta b ility o f th is stru ctu re ty p e w ill b e d e c r e ased by rep la ce m en t o f N a + by io n s w ith h ig h er o x id a tio n sta tes. | | |
Reference
| Z. Naturforsch. 49b, 911 (1994); eingegangen am 17. Februar 1994 | | |
Published
| 1994 | | |
Keywords
| Barium, Titanium, Chromium, Oxide, Crystal Structure | | |
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| default:Reihe_B/49/ZNB-1994-49b-0911.pdf | | | Identifier
| ZNB-1994-49b-0911 | | | Volume
| 49 | |
18 | Author
| S. Frenzen, Hk Müller-Buschbaum | Requires cookie* | | Title
| Uber einen 9L-Perowskit der Zusammensetzung Ba9Ru3? 2Mn5?8027 On a 9L-Perovskite of the Composition Ba9Ru3 2Mn5 80 27  | | | Abstract
| Single crystals of Ba9Ru3 2Mn5 80 27 have been prepared by flux techniques. X-ray four circle diffractometer measurements led to trigonal (rhombohedral) symmetry, space group D3d-R 3 m , a = 5.7043(5), c = 21.255(4) A , Z = 1. This phase is isotypic to B a R u 0 3. The crystal structure and the occupation of the M3O i2 triple octahedra by ruthenium and manga nese are discussed with respect to other oxides containing M30 12 groups in an ordered and disordered way. | | |
Reference
| Z. Naturforsch. 50b, 585 (1995); eingegangen am 10. Oktober 1994 | | |
Published
| 1995 | | |
Keywords
| Barium, Ruthenium, M anganese, Oxide, Perovskite, Structure | | |
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| default:Reihe_B/50/ZNB-1995-50b-0585.pdf | | | Identifier
| ZNB-1995-50b-0585 | | | Volume
| 50 | |
19 | Author
| HkM. Üller-Buschbaum, B. M. Ertens | Requires cookie* | | Title
| Single Crystal X-Ray Analysis of Ba3Ce R  | | | Abstract
| Single crystals of (I) Ba3C eRu20 9, (II) Ba3SmRu20 9, (III) Ba3D yR u20 9, (IV) Ba3ErRu20 9 and (V) Ba3Ti24Ru0.6O 9 have been prepared by high temperature solid state reactions. The compounds were exam ined by X-ray techniques. They crystallize with hexagonal symmetry, | | |
Reference
| (Z. Naturforsch. 51b, 79 [1996]; eingegangen am 18. Mai 1995) | | |
Published
| 1996 | | |
Keywords
| Barium, Rare Earth, Ruthenium Oxide, Titanium, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0079.pdf | | | Identifier
| ZNB-1996-51b-0079 | | | Volume
| 51 | |
20 | Author
| St Gallinat, Hk Müller-Buschbaum | Requires cookie* | | Title
| Two Examples of Partial and Total Defects in the B a«Ln2Mo4O i6-Type: BaCu0 41 ■o,59Pr2Mo4 0 16 and BaBYb2Mo4Ojg  | | | Abstract
| Single crystals of (I) BaCu0.4iPr2M o4O 16 and (II) BaYb2M o40 16 have been prepared by flux technique. Both compounds crystallize with m onoclinic symmetry, space group C2h-C 2 /c with (I): a = 5.352(11), b = 12.888(2), c = 19.399(4) A; ß = 90.89(3)°; (II): a = 5.181(7), b = 12.467(3), c -19.350(3) Ä , ß -91.93(2)°, Z = 4. The crystal structure is characterized by i [ B a M 0 12]-chains along [010]. In the first case the M positions are occupied by copper by about 41%, in the second case these positions remain com pletely unoccupied. With respect to the crystal chemistry of the reference compound Ba(Cu0.22Mg() 78)Nd2Mo4O 16 all substan ces of the composition BaLn2M o40 16 should be written as Ba»Ln2Mo40 16 indicating the holes in th e^ B a M O i^ -c h a in s by ■. | | |
Reference
| (Z. Naturforsch. 51b, 85—8 [1996]; eingegangen am 7. Juni 1995) | | |
Published
| 1996 | | |
Keywords
| Barium, Copper, Rare Earth, Molybdenum Oxide, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0085.pdf | | | Identifier
| ZNB-1996-51b-0085 | | | Volume
| 51 | |
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