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 .

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.

Verknüpfung von (TeO6)6- und (TeO6)3(NiO6)3-Sechsringen durch TeNiO9-Oktaederdoppel in Pb3Ni4,5Te2,5O15 / Connection of (TeO6)6 and (TeO6)3(NiO6)3 Hexagons by TeNiO9 Octahedra Double in Pb3Ni4,5Te2,5O15

1998 ◽  
Vol 53 (5-6) ◽  
pp. 527-531 ◽  
Author(s):  
B. Wedel ◽  
K. Sugiyama ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Lone Pair ◽  
Lattice Energy ◽  
Hexagonal Symmetry ◽  
X Ray ◽  
Lattice Constants ◽  
The One ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Pb3Ni4.5Te2.5O15 have been prepared by heating pellets of mixtures of PbO, TeO2 and nickel hydroxide carbonate to 730 °C in air. X-ray investigations led to hexagonal symmetry, space group d66-P6322, lattice constants a = 10.2589(1), c = 13.554(5), Z = 4. Typical features of the crystal structure are face sharing TeNiO9 octahedra doubles and planes of connected (TeO6)6 and (TeO6)3(NiO6)3 hexagons. The one-sided coordination of lead by oxygen is complemented by the lone pair of electrons. The lone pair positions are estimated by calculations of the Coulomb terms of lattice energy.

Isolierte 1∞[TeO5]-Oktaederketten im Bleitellurat Pb2TeO5 / Isolated 1∞[TeO5] Chains of Octahedra in the Lead Tellurate Pb2TeO5

1998 ◽  
Vol 53 (3) ◽  
pp. 287-290 ◽  
Author(s):  
B. Wedel ◽  
L. Wulff ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Lone Pair ◽  
Lattice Energy ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Pb2TeO5 have been prepared by flux techniques. X-ray investigations showed a new crystal structure with monoclinic symmetry, space group C4S -Cc, a = 13.099(3), b = 5.714(1), c = 7.520(2) Å, β = 123,80(3)°, Z = 4. Pb2TeO5 is characterized by 1∞[TeO5] chains of octahedra isolated from each other and incorporated into an edge, corner and face connected frame of PbO7 polyhedra. Possible positions of the lone pair of electrons of Pb2+ are estimated by calculations of Coulomb terms of lattice energy.

Planare CuO4-Polygone und eine einseitig offene Te4+O3-Koordination in SrCuTe2O6 / Planar CuO4 Polygons and a One-Sided Open Te4+O3 Coordination in SrCuTe2O6

1997 ◽  
Vol 52 (11) ◽  
pp. 1341-1344 ◽  
Author(s):  
L. Wulff ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Lone Pair ◽  
Lattice Energy ◽  
Cubic Symmetry ◽  
X Ray ◽  
Oxygen Coordination ◽  
Square Planar ◽  
The One ◽  
Symmetry Space ◽  
Symmetry Space Group

AbstractThe new compound SrCuTe2O6 has been prepared by quenching single crystals grown from a flux of SrCO3, TeO2 and CuCO3·Cu(OH)2. X-ray investigations show cubic symmetry, space group O7-P41 32, lattice constant a = 12.473(1), Z = 12. The crystal structure is characterized by square planar CuO4 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.

scholarly journals Kristallstrukturuntersuchung an einem bismuthaltigen Hollandit: Bi1.9CU4V4O16 / Crystal Structure Investigation of the Bismuth Containing Hollandite: Bi1.9Cu4V4O16

1995 ◽  
Vol 50 (8) ◽  
pp. 1163-1166 ◽  
Author(s):  
J. Feldmann ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Lone Pair ◽  
Lattice Energy ◽  
Tetragonal Symmetry ◽  
Structure Investigation ◽  
X Ray ◽  
Laser Heated ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Bi1.9Cu4V4O16 have been prepared by quenching of CO2-LASER heated samples. They were investigated by X-ray techniques. The compound crystallizes with tetragonal symmetry, space group C54h-I4 /m , a = 9.945(2) Å , c = 2.915(3) Å, Z = 1, and is isotypic to the mineral Hollandite. Bi1.9Cu4V4O16 is the first Hollandite with a statistical distribution of vanadium and copper in the network of octahedra. Calculations of the Coulomb terms of lattice energy led to a distance of bismuth to the lone pair of 1.07 Å. Considering the lone pair as part of the coordination sphere of Bi3+ a square pyramidal polyhedron is obtained.

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.

Zur Darstellung und Kristallstruktur eines neuen Kupfer-Antimon-Oxomolybdats: CuSbMo2O8 / On the Synthesis and Crystal Structure of a New Copper Antimony Oxomolybdate: CuSbMo2O8

1995 ◽  
Vol 50 (5) ◽  
pp. 717-720 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Type ◽  
Monoclinic Symmetry ◽  
Unknown Compound ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of the hitherto unknown compound CuSbMo2O8 were prepared by recrystallization from melts in closed copper tubes and investigated by X-ray diffractometer technique. CuSbMo2O8 crystallizes in a new structure type with monoclinic symmetry, space group C62h - I12/a1, a = 5.554(2), b = 4.916(1), c = 21.519(4) Å, β = 93.42(3)°, Z = 4. The crystal structure shows SbIII in a one-sided coordination by four oxygen. Molybdenum shows the rare octahedral coordination by oxygen. MoO6 and CuO6 octahedra form triple layers stacked and connected by Sb ions along [001].

Synthese und Kristallstruktur von KCuHo2Mo4O16 / Synthesis and Crystal Structure of KCuHo2Mo4O16

1994 ◽  
Vol 49 (3) ◽  
pp. 350-354 ◽  
Author(s):  
Holger Szillat ◽  
Hanskarl Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Type ◽  
Monoclinic Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Symmetry Space ◽  
Related Compounds ◽  
Symmetry Space Group

Abstract Single crystals of KCuHo2Mo4O16 have been prepared by recrystallisation from melts and investigated by X-ray diffractometer techniques. The compound crystallizes with monoclinic symmetry, space group C 2/c, a = 521.6(1), b = 1251.3(2), c = 1953.1(2) pm, β = 92.903(18)°, Z = 4. KCuHo2Mo4O16 represents a new structure type characterized by HoO8 and alternate CuO6/KO10 polyhedra chains. The connection of these polyhedra chains to each other and by MoO4 tetrahedra is described and the crystal structure discussed with respect to related compounds of the CuLnMo2O8 and KLnMo2O8 types.

Synthese und Kristallstruktur eines Barium-Zink-Vanadyl-phosphats BaZn(VO)(PO4)2 mit [(VO)PO4]-Schichten / Synthesis and Crystal Structure of a Barium-Zinc-Vanadyl-Phosphate BaZn(VO)(PO4)2 Containing [(VO)PO4] Layers

1997 ◽  
Vol 52 (3) ◽  
pp. 367-371 ◽  
Author(s):  
S. Meyer ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Typical Feature ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
Vanadyl Phosphate ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of BaZn (VO)(PO4)2 have been prepared by solid state reactions of prereacted BaCO3 and P2O5 mixtures with ZnO, V2O3 and V2O5 in evacuated quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D2h15 -Pbca, a = 8.814(1), b = 9.039(1), c = 18.538(1) A, Z = 8 . The crystal structure is characterized by layers of PO4 tetrahedra and square VO1+5 pyramids, connected by corrugated layers of PO4 and ZnO4 tetrahedra. The resulting tunnel structure is filled by Ba2+ ions. The short distance of the V4+ center to the apical oxygen atom of the square VO5 pyramids is a typical feature of vanadyl groups.

Synthese und Kristallstruktur von Cu0.25Ho1.25W2O8 / Synthesis and Crystal Structure of Cu0.25Ho1.25W2O8

1994 ◽  
Vol 49 (8) ◽  
pp. 1145-1149 ◽  
Author(s):  
Holger Szillat ◽  
Hanskarl Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Type ◽  
Octahedral Coordination ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Point Position ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Cu0.25Ho1.25W2O8 were prepared by recrystallization from melts and investigated by X-ray diffractometer technique. Cu0.25Ho1.25W2O8 crystallizes with mono­clinic symmetry, space group C2/c, a = 19.123, b = 5.613, c = 11.479 Å, β = 111.44°. Z = 8. It represents a new structure type characterized by W4O18 groups and Cu+/Ho3+ at one point position in statistical distribution. Cu+/Ho3+ show an octahedral coordination. Another point position is occupied by Ho3+ with C. N. = 7.

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