Gemischtvalente Oxovanadate, I Ein neuer Strukturtyp für die Verbindung BaV10O15/Oxovanadates with Mixed Valence, I A New Crystal Structure of BaV10O15

1980 ◽  
Vol 35 (6) ◽  
pp. 669-671 ◽  
Author(s):  
D. Chales de Beaulieu ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Mixed Valence ◽  
Structure Type ◽  
Orthorhombic Symmetry ◽  
Temperature Reaction ◽  
X Ray ◽  
High Temperature Reaction ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract BaV10O15 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 V3+/V2+ (statistical distribution) and cuboctahedral surrounding of Ba2+ . Orthorhombic symmetry, space group D182h-Ccmb, a = 995,8; b = 1161,8; c = 941,0; Z = 4.

scholarly journals Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2Nb2TeO10 / On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO10

1996 ◽  
Vol 51 (10) ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Wedel ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba2Nb2TeO10) have been prepared by solid state reactions in air. X-ray investigations led to orthorhombic symmetry, space group D152h-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Å. Z = 4. Nb5+ and Te6+ show octahedral coordination by O2- . The crystal structure is characterized by planes of edge- and corner-sharing NbO6- and TeO6octahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO10 with compounds of the composition M0,5BaNbTe2O9 the so far unknown crystals of these substances may not be derived from the Ba2Nb2TeO10 type.

Dicobaltoarsenat -(CoAsO7) -Baugruppen im Cobaltoxid-Tellurat Co6O2[T eO4(CoAsO5)2] / Dicobaltoarsenate - (CoAsO7) - Groups in the Cobalt Oxide Tellurate Co6O2[TeO4(CoAsO5)2]

1997 ◽  
Vol 52 (5) ◽  
pp. 643-646 ◽  
Author(s):  
M. Staack ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Cobalt Oxide ◽  
Structure Type ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract The compound Co6O2 [TeO4(CoAsO5)2] has been prepared by solid state reactions. Single crystal X -ray techniques led to orthorhombic symmetry, space group D 182h-Cmca, a = 6.020(1), b = 23.763(5), c = 8.841(2) Å , Z = 4. The new structure type contains the hitherto unknown cobaltoarsenate group CoAsO7, oxidic oxygen connected exclusively to cobalt, and TeO6 octahedra.

Zur Kristallstruktur von ( Cu ,Mn )3,66Mo3O12/On the Crystal Structure of (Cu ,Mn)3,66Mo3O12

1996 ◽  
Vol 51 (3) ◽  
pp. 447-449 ◽  
Author(s):  
O. Sedello ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of (Cu,Mn)3.66Mo3O12 have been prepared in sealed copper tubes. X-ray investiga­tions lead to orthorhombic symmetry, space group D2h16-Pnma, a = 5.1541(9), b = 10.788(2), c = 18.114(3)) Å , Z = 4. (Cu,Mn)3.66Mo3O12 is iso­typic to NaCo2.31Mo3O12 and (Cu,Co)3.75Mo3O12 with split positions for two of the metals.

Kurze O-O-Abstände einer gemeinsamen Polyederkante bei Verknüpfung von PO4-Tetraedern mit VO6-Oktaedern im Vanadyl-Orthophosphat CaNi(VO)(PO4)2 / Short O-O Distances in Edge Sharing PO4 Tetrahedra and VO6 Octahedra of the Vanadyl- Orthophosphate CaNi(VO)(PO4)2

1997 ◽  
Vol 52 (8) ◽  
pp. 981-984 ◽  
Author(s):  
S Meyer ◽  
Hk Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
Oxide Mixture ◽  
X Ray ◽  
Vanadyl Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of the new compound CaNi(VO)(PO4)2 have been prepared by solid state reactions below the melting point of the oxide mixture in evacuated quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D2h16-Pnma, a =14.113(1), b =6.408(1), c = 7.364(1) Å, Z = 4. The crystal structure shows 1∞[NiO4] and 1∞[VO6P2O3] polyhedra chains closely related to analogous chains in the isotypic compound CdV2O(PO4)2. The short V -O distance of 1.66 Å indicates a vanadyl group as the main difference to CdV2O(PO4)2. The short O-O distance of 2,395 Å of the edge-sharing PO4 tetrahedra and VO6 octahedra is discussed.

Synthese und Kristallstruktur des Barium -Kupfer-Tellurit-Tellurats BaCuTeO3TeO4 / Synthesis and Crystal Structure of the Barium Copper Tellurite-Tellurate BaCuTeO3TeO4

1996 ◽  
Vol 51 (4) ◽  
pp. 465-468 ◽  
Author(s):  
O. Sedello ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Lone Pair ◽  
Lattice Energy ◽  
Structure Type ◽  
Orthorhombic Symmetry ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Barium Copper ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of BaCuTeO3TeO4 have been prepared by crystallisation from melts. X-ray investigations lead to orthorhombic symmetry, space group C162v-Ama2, a = 5.4869(8), b = 15.412(1), c = 7.2066(4) Å , Z = 4. This compound represents a new structure type, containing BaO10, CuO5, TeO6 and TeO4 polyhedra. The lone pair (E) of TeIV completes the TeIVO4 polyhedron to a trigonal TeO4E bipyramid. The Te to E distance is estimated by calculations of the Coulomb terms of lattice energy to 1.43 Å .

Ein Beitrag zur Synthese und Kristallchemie des Alkalimetall-Kupfer -Oxomolybdats Rb0,6K0,4CuMo3O10 / A Contribution on the Synthesis and Crystal Chemistry of the Alkaline Copper Oxomolybdate Rb0.6K0.4CuMo3O10

1995 ◽  
Vol 50 (6) ◽  
pp. 875-878 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Orthorhombic Symmetry ◽  
One Dimensional ◽  
X Ray ◽  
The One ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Rb0.6K0.4CuMo3O10 have been prepared by crystallization from melts and investigated by X-ray diffractometer technique. They crystallize with orthorhombic symmetry, space group D2h16 -Pnma , a = 8.606(2), b = 7.595(3), c - 13.660(7) Å, Z = 4. The crystal structure of Rb0.6K0.4CuMo3O10 is characterized by the rare octahedral coordination of molybdenum and is related to (NH4)2Mo3O10 with respect to the one-dimensional 1∞[Mo3O10]- chains.

Zur Kenntnis des Oxocuprats (Cu,Co)3,75Mo3O12 / On the Oxocuprate (C u,Co)3,75Mo3O12

1995 ◽  
Vol 50 (5) ◽  
pp. 707-711 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
The Other ◽  
Rectangular Prism ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of (Cu,Co)3,75Mo3O12 have been prepared by recrystallization from melts and investigated by X-ray diffractometer techniques. The compound crystallizes with orthorhombic symmetry, space group D162h-Pnma, a = 5.092(1), b = 10.624(3), c = 17.804(4) Å, Z = 4 and is isotypic to NaCo2.31Mo3O12. The crystal structure is discussed and it is shown, that the trigonal prismatically coordinated copper positions are occupied in a different manner. One of the alternate sites is beside the centre of the prisms, and the other one is shifted towards one of the faces of the rectangular prism. This detail may be interpreted by assigning the valance states CuI and CuII. The MO6 octahedra are occupied statistically by copper and cobalt.

scholarly journals Synthese und Kristallstruktur von (Cu,Fe)3,63Mo3O12. Ein Oxometallat mit eindimensional flächenverkniipften Oktaederketten / Synthesis and Crystal Structure of (Cu,Fe)3,63Mo3O12. An Oxometallate Showing One-Dimensional Chains of Face Sharing Octahedra

1996 ◽  
Vol 51 (1) ◽  
pp. 90-94 ◽  
Author(s):  
O. Sedello ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Tetrahedral Coordination ◽  
Synthesis And Crystal Structure ◽  
One Dimensional ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of (Cu,Fe)3,63Mo3O12 have been prepared by crystallisation from melts. X-ray investigations lead to orthorhombic symmetry, space group D24-P212121, a = 5.0952(8), b = 10.637(2), c = 17.881(3) Å, Z = 4. (Cu,Fe)3,63Mo3O12 is isotypic to Cu3,85Mo3O12 or (Cu,Zn)3,75Mo3O12. Molybdenum shows tetrahedral coordination by oxygen. Cu+ and Fe2+ are probably distributed statistically over four different point positions. Interesting features of the crystal structure are one-dimensional chains of face shared (Cu,Fe)O6 octahedra.

Ein [Ba(Ca,Mn)O6]-Gerüst mit eingelagerten V-O-V-Gruppen in der Kristallstruktur von Ba(Ca0.6Mn0.4)V2O7 /A [Ba(Ca,Mn)O6] Framework with Incorporated V-O-V Groups in the Crystal Structure of Ba(Ca0.6Mn0.4)V2O7

1997 ◽  
Vol 52 (7) ◽  
pp. 785-789 ◽  
Author(s):  
R. Rettich ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Vanadium Oxide ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Ba(Ca0.6Mn0.4)V2O7 have been prepared by crystallization from melts. X-ray investigations revealed a new quaternary vanadium oxide of the type BaMV2O7. The M positions are occupied statistically by Ca2+ and Mn2+. The compound crystallizes with orthorhombic symmetry, space group D2h16-Pnma, a = 15.429(2), b - 5.7005(12), c = 7.364(2) Å, Z = 4. The crystal structure can be interpreted as a [Ba(Ca,Mn)O6] network with incorporated V-O- V groups. Considering the nearest O2- neighbours of the incorporated vanadium, the V-O-V groups are complemented to give V2O7 divanadate units. Ba(Ca0.6Mn0.4)V2O7 is isotypic to BaMV2O7 (M=Ca,Cd) but not to BaMnV2O7.

Kristallstrukturuntersuchung des Kupfer-Cadmium-Oxovanadats CuCdVO4 / Crystal Structure Investigation of the Copper Cadmium Oxovanadate CuCdVO4

1995 ◽  
Vol 50 (6) ◽  
pp. 871-874 ◽  
Author(s):  
J. Feldmann ◽  
S. Münchau ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Structure Investigation ◽  
Space Group ◽  
X Ray ◽  
Laser Techniques ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of CuCdVO4 have been prepared by CO2-LASER techniques. X -ray investigations of the black single crystals led to orthorhombic symmetry, space group D2h17-Cmcm , a = 5.921(1), b = 9.065(4), c = 6.633(2) Å, Z = 4. CuCdVO4 represents the first example of a quaternary oxide containing cadmium and copper(I). Compared to AgCdVO4, CuCdVO4 shows a different linkage of the VO4 and CuO4 tetrahedra, explaining the missing isotypy of these com pounds.

Sign in / Sign up

Export Citation Format

Share Document