| | 1 | Author
| Hk Wedel, Müller-Buschbaum | Requires cookie* | | | Title
| Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2 Nb2TeOi<) On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO,0 B  | | | | Abstract
| Single crystals of Ba^NbiTeO,,) have been prepared by solid state reactions in air. X-ray investigations led to orthorhom bic symmetry, space group D ^-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Ä. Z = 4. Nb""'* and Te6+ show octahedral coordination by O '-. The crystal structure is characterized by planes of edge-and corner-sharing NbOh-and TeOfloctahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO |0 with compounds of the composition M() 5BaNbTe20 9 the so far unknown crystals of these substances may not be derived from the Ba^Nb^TeOio type. | | | |
Reference
| Z. Naturforsch. 51b, 1407—1410 (1996); eingegangen am 12. April 1996 | | | |
Published
| 1996 | | | |
Keywords
| Barium, Niobium, Tellurium Oxide, Crystal Structure | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1407.pdf | | | | Identifier
| ZNB-1996-51b-1407 | | | | Volume
| 51 | |
| 2 | Author
| B. W. Edel, HkM. Üller-B, Uschbaum | Requires cookie* | | | Title
| Über die Kristallstrukturen der Tellurate Pb3Fe2Te20 12 und Pb2CoTe06 | | | | Abstract
| Pb3Fe2Te20 |2 (I) and Pb2C oT e06 (II) have been prepared by crystallization from melts. Single crystal X-ray investigations led to monoclinic (I) and tetragonal (II) symmetry, space groups Cs-Cc and D{J-I4/mmm. Lattice constants I: a = 9.866(3), b = 15.332(4), c = 7.172(2) A, ß = 111.34(3)°, Z = 4. II: a = 5.661(5), c = 8.004(7) A, Z = 2. (I) represents a new crystal structure, characterized by a network of octahedra occupied by Fe + and Te6+ in a disordered manner. The centres of negative charge of the lone pairs of Pb2+ in I are estimated by Coulomb term calculations. II belongs to the elpasolithe type. | | | |
Reference
| (Z. Naturforsch. 52b, 35—39 [1997]; eingegangen am 2. September 1996) | | | |
Published
| 1997 | | | |
Keywords
| Lead, Iron, Cobalt, Tellurium Oxide, Crystal Structure | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0035.pdf | | | | Identifier
| ZNB-1997-52b-0035 | | | | Volume
| 52 | |
| 3 | Author
| Hk Wulff, Müller-Buschbaum | Requires cookie* | | | Title
| Planare C u 0 4-Polygone und eine einseitig offene Te4+0 3-Koordination in SrCuTe20 6 Planar C u 0 4 Polygons and a One-Sided Open Te4+0 3 Coordination in SrCuTe-,06 L | | | | Abstract
| The new compound SrCuTe20 6 has been prepared by quenching single crystals grown from a flux of SrC 03, T e02 and C uC 03 C u(0H)2. X-ray investigations show cubic symmetry, space group 0 7-P4| 32, lattice constant a = 12.473(1), Z = 12. The crystal structure is characterized by square planar C u 0 4 polygons and a one-sided open triangular oxygen coordination of Te4+, both incorporated in a Sr/O network. The one sided oxygen coordination of tellurium is completed by the lone pair of Te4+. Calculations of the Coulomb parts of lattice energy led to the position of the lone pair centre. | | | |
Reference
| Z. Naturforsch. 52b, 1341—1344 (1997); eingegangen am 26. August 1997 | | | |
Published
| 1997 | | | |
Keywords
| Strontium, Copper, Tellurium Oxide, Crystal Structure | | | |
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| default:Reihe_B/52/ZNB-1997-52b-1341.pdf | | | | Identifier
| ZNB-1997-52b-1341 | | | | Volume
| 52 | |
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