Hochtemperatursynthese und Kristallchemie der Oxotantalate Cr2+0,761Ta2,095O6 und FeTa2O6 / High Temperature Synthesis and Crystal Chemistry of the Oxotantalates Cr2+0,761Ta2,095O6 and FeTa2O6

1995 ◽  
Vol 50 (5) ◽  
pp. 712-716 ◽  
Author(s):  
E. Peters ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Monoclinic Symmetry ◽  
Temperature Synthesis ◽  
Space Group ◽  
High Temperature Synthesis ◽  
Laser Techniques ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Black single crystals of Cr0.761Ta2.095O6 have been prepared by CO2-LASER techniques. This phase crystallizes with monoclinic symmetry, space group C52h-P21/c, a = 4.748(1). b = 4.750(2), c = 10.405(3) Å, β = 117.152(13)°, Z = 2. The crystal structure is closely related to the trirutile type, although the metal positions are partly statistically occupied by Cr2+ and Ta5+ or underoccupied by Ta5+, respectively. FeTa2O6, prepared by the same m ethod does neither show any statistic occupation nor deviations from the trirutile structure, space group D144h-P42/mnm, a = 4.7595(5) Å, c = 9.201(2)A, Z = 2 .

Zur Synthese und Kristallstruktur von manganhaltigen Boratoxiden: MnFe(BO3)O und MnAl0,5Yo,5(BO3)O / Synthesis and Crystal Structure of Manganese Borate Oxides: MnFe(BO3)O and MnAl0,5Yo,5(BO3)O

1995 ◽  
Vol 50 (8) ◽  
pp. 1146-1150 ◽  
Author(s):  
Anne Utzolino ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Metal Ions ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Monoclinic Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of the compounds MnFe(BO3)O (I) and MnAl0.5Y0.5(BO3)O (II), were obtained by a B2O3 flux technique. I crystallizes with orthorhombic symmetry, space group D162h -Pnma (Nr.62), a = 939.92; b = 319.41; c = 939.11 pm; Z = 4 and II with monoclinic symmetry, space group C52h-P21/n (Nr. 14). a = 325.6; b = 955.1; c = 929.2 pm; β = 90.70° ; Z = 4. I is isotypic to the mineral Warwickite, while II is a distorded variant of this structure. All metal ions are octahedrally coordinated. Both structures contain isolated, trigonal planar BO3 units and oxygen atoms that are not coordinated to boron.

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.

Über das Oxomolybdat AgKCu3Mo4O16 mit Silber in siebenfacher Koordination / About the Oxomolybdate AgKCu3Mo4O16 with Silver in Seven-Fold Coordination

1995 ◽  
Vol 50 (2) ◽  
pp. 252-256 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Silver Copper ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of AgKCu3Mo4O16 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. This compound crystallizes with monoclinic symmetry, space group C2h5 - P21/c, a = 5.056(1), b = 14.546(4), c = 19.858(9) Å, β = 86.64(5)°, Z = 4. The crystal structure of AgKCu3Mo4O16 is closely related to K2Cu3Mo4O16 showing ribbons of edge-sharing CuO6 and AgO7 polyhedra. The ribbons are linked by tetrahedrally coordinated molybdenum and K2O10 groups. Another kind of MoO4 tetrahedra occupies the cavities inside the ribbons. The crystal structure and the coordination of silver, copper, potassium and molybdenum by oxygen are discussed with respect to K2Cu3Mo4O16.

Synthese and Krystalchemie der β-Form eines gemischten Zinkorthoarsenats: Zn2,28Mg0,72(AsO4)2 / Synthesis and Crystal Chemistry of the β-Form of a Mixed Zinc Orthoarsenate: Zn2.28Mg0.72(AsO4)2

1996 ◽  
Vol 51 (4) ◽  
pp. 469-472 ◽  
Author(s):  
D. Frerichs ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Crystal Chemistry ◽  
Lattice Parameters ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
Laser Techniques ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Zn2.28Mg0.72(AsO4)2 have been prepared by CO2 LASER techniques. The compound crystallizes with monoclinic symmetry space group C52h-P21/n and the lattice parameters a = 5.292(2), b = 8.450(3), c = 7.737(3) Å , β = 96.33(3)°, Z = 2. Zn2.28Mg0.72(AsO4)2 is isotypic to β-Zn3(AsO4)2. The formation of the β-Zn3(AsO4)2 struc­ture instead of other possible orthoarsenates is discussed.

Über einen 9L-Perowskit der Zusammensetzung Ba9Ru3,2Mn5,8O27/ On a 9L-Perovskite of the Composition Ba9Ru3.2Mn5.8O27

1995 ◽  
Vol 50 (4) ◽  
pp. 585-588 ◽  
Author(s):  
S. Frenzen ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group ◽  
Rhombohedral Symmetry

Single crystals of Ba9Ru3.2Mn5.8O27 have been prepared by flux techniques. X-ray four circle diffractometer measurements led to trigonal (rhombohedral) symmetry, space group D53d - R3̄̄̄m , a = 5.7043(5), c = 21.255(4) Å , Z = 1. This phase is isotypic to BaRuO3. The crystal structure and the occupation of the M3O12 triple octahedra by ruthenium and manganese are discussed with respect to other oxides containing M3O12 groups in an ordered and disordered way.

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.

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.

scholarly journals Notiz zur Kristallchemie von LiBa2Cu3O6 / Note on the Crystal Chemistry of LiBa2Cu3O6

1995 ◽  
Vol 50 (4) ◽  
pp. 681-683 ◽  
Author(s):  
G. Tams ◽  
Hk. Müller-Buschbaum ◽  
Ch. Lang
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Laser Heating ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of LiBa2Cu3O6 have been prepared by recrystallization from melts in a stream of dry Argon as well as by spontaneous CO2- LASER heating. It crystallizes with orthorhom bic symmetry, space group D232h - Fmmm, a = 8,219(2), b = 11,520 (2), c = 14,284(3) Å, Z = 8. The crystal structure is isotypic to NaBa2Cu3O6.

scholarly journals Zur Kristallchemie von CuDyMo2O8 und CuYbMo2O8

1996 ◽  
Vol 51 (2) ◽  
pp. 240-244
Author(s):  
Hk. Müller-Buschbaum ◽  
St. Gallinat
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Rare Earth Ions ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group ◽  
The Rare Earth

Abstract Single crystals of (I) CuDyMo2O8 and (II) CuYbMo2O8 have been prepared by crystalli­sation from melts. Both com pounds crystallize with orthorhombic symmetry, space group D152h-Pbca with (I): a = 10.195(1), b = 9.721(2), c = 14.563(3); (II): a = 10.094(6), b = 9.628(9), c = 14.467(8) Å, Z = 8. The crystal structure is characterized by a triangular CuO3-polygon, a square antiprismatic coordination around the Rare Earth ions and the typical Mo O4 tetra­ hedra.

Zwei Beispiele fiir partielle und totale Defekte im Ba▪Ln2Mo4O16-Typ: BaCu0,41▪0,59Pr2Mo4O16 und Ba▪Yb2Mo4O16 / Two Examples of Partial and Total Defects in the Ba▪Ln2Mo4O16-Typ: BaCu0,41▪0,59Pr2Mo4O16 and Ba▪Yb2Mo4O16

1996 ◽  
Vol 51 (1) ◽  
pp. 85-89 ◽  
Author(s):  
St. Gallinat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Reference Compound ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
First Case ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of (I) BaCu0,41Pr2Mo4O16 and (II) BaYb2Mo4O16 have been prepared by flux technique. Both compounds crystallize with monoclinic symmetry, space group C62h-C2/c with (I): a = 5.352(11), b = 12.888(2), c = 19.399(4) Å; β = 90.89(3)°; (II): a = 5.181(7), b = 12.467(3), c -19.350(3) Å , β -91.93(2)°, Z = 4. The crystal structure is characterized by 1∞[BaMO12]-chains along [010]. In the first case the M positions are occupied by copper by about 41%, in the second case these positions remain completely unoccupied. With respect to the crystal chemistry of the reference compound Ba(Cu0.22Mg0,78)Nd2Mo4O16 all substances of the composition BaLn2Mo4O16 should be written as Ba▪Ln2Mo4O16 indicating the holes in the 1∞[BaMO12]-chains by ▪.

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