Über ein niedervalentes Titan-Wolframoxid: Ti0,54W0,46O2 / On a Low Valent Titanium Tungsten Oxide: Ti0,54W0.46O2

1996 ◽  
Vol 51 (1) ◽  
pp. 29-31 ◽  
Author(s):  
E. Peters ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Metal Ions ◽  
Tungsten Oxide ◽  
Single Crystals ◽  
Pair Formation ◽  
Rutile Structure ◽  
Space Group ◽  
Structure Space ◽  
Laser Techniques ◽  
Low Valent ◽  
Group D

Abstract Single crystals of Ti0.54W0.46O2 have been prepared by CO2-LASER techniques. This phase crystallizes with a non-distorted rutile structure, space group D144H-P42/mnm, a = 4.6862(4), c = 2.9039(3) Å, Z = 2. Split positions of the statistically distributed metal ions show the existence of W-W pair formation as reported for pure WO2.

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.

Ein Titan-Tantaloxid mit TiII: Ti0,33 Ta0,67O2 (TiTa2O6) / A Titanium Tantalum Oxide of TiII: Ti0,33 Ta0,67O2 (TiTa2O6)

1995 ◽  
Vol 50 (8) ◽  
pp. 1167-1170 ◽  
Author(s):  
E. Peters ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Tantalum Oxide ◽  
Tetragonal Symmetry ◽  
Rutile Structure ◽  
Lattice Constants ◽  
General Terms ◽  
Laser Techniques ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Black single crystals of Ti0.33Ta0.67O2 have been prepared by CO2-LASER techniques heating a mixture of TiO and Ta2O5 to T > 2000 °C. The titanium tantalum oxide crystallizes with tetragonal symmetry, space group D144h -P42/mnm, lattice constants a = 4.7344(6) Å c = 3.0504(2) Å, Z = 2. Ti0.33Ta0.67O2 represents the compound TiTa2O6 with rutile structure because of the statistical distribution of Ti2+ and Ta5+. The composition of rutile-type compounds is discussed in more general terms.

Die Synthese und Kristallstruktur von cobalthaltigen Boratoxiden: Co1,5Ti0,5(BO3)O und Co1,5Zr0,5(BO3)O / Synthesis and Crystal Structure of Cobalt Containing Borate Oxides: Co1.5Ti0.5(BO3)O and Co1.5Zr0.5(BO3)O

1995 ◽  
Vol 50 (11) ◽  
pp. 1653-1657 ◽  
Author(s):  
Anne Utzolino ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Metal Ions ◽  
Single Crystals ◽  
Orthorhombic Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Oxygen Ions ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Co1.5Ti0.5(BO3)O (I) and Co1.5Zr0.5(BO3)O (II) were obtained by a B2O3 flux technique. Both compounds crystallize with orthorhombic symmetry, space group D162h-Pnma (Nr. 62), I a = 928.1; b = 311.1; c = 940.1 pm; Z = 4 and II a = 949.5; b = 323.42; c = 934.7 pm; Z = 4. The compounds are isotypic to the mineral warwickite. All metal ions are octahedrally coordinated by oxygen ions. The structure contains isolated, trigonal planar BO3 units and oxygen that is 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.

Geordnete Metallverteilung in KBaVO4 und KSrVO4 mit β-K2SO4-Struktur / Ordered Metal Distribution in KBaVO4and KSrVO4 Showing β -K2SO4 Structure

1996 ◽  
Vol 51 (4) ◽  
pp. 477-480 ◽  
Author(s):  
O. Schrandt ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Lattice Energy ◽  
Metal Distribution ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of KBaVO4(I) and KSrVO4(II) have been prepared by crystallization from V2O5 flux. The yellowish crystals show orthorhombic symmetry, space group D162h-Pnma with (I): a = 7.774(2), b = 5.899(1), c = 10.375(2) Å , (II): a = 7.400(2), b = 5.812(1), c -9.961(1), Z = 4. Both compounds show an ordered distribution of K+ and Ba2+ and Sr2+ respectively. The different sizes of the KO10 and BaO9 (SrO9) polyhedra are discussed with respect to those of the β-K2SO4 structure, considering the calculations of the Coulomb terms of lattice energy.

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.

Zur Kenntnis von Ba2Fe22+ Fe93+Al11O34 / About Ba2Fe22+ Fe93+Al11O34

1978 ◽  
Vol 33 (2) ◽  
pp. 146-148 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
M. Harder
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Data Space ◽  
Group D ◽  
O 11

Single crystals of the compound Ba2Fe11Al11O34 were prepared by solid state reaction (1700 °C) of BaO-Fe2O3-Al2O3 mixtures. The crystal structure was investigated by X-ray data (space group D46h-P63/mmc, lattice constants: a = 565.3, c = 2281.0 pm). Ba2Fe11Al11O34 is isotypic with Na2O · 11 Al2O3, the structure of β-alumina

Ein Beitrag zur Chemie von Verbindungen des Bautyps MxPd3O4 / A Contribution to the Chemistry of the Compounds MxPd3O4

1979 ◽  
Vol 34 (12) ◽  
pp. 1661-1662 ◽  
Author(s):  
H.-J. Meyer ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
Structure Space ◽  
Ray Methods

Single crystals of a new compound Pd0.5Pd3O4 were prepared and investigated by X-ray methods. It crystallizes with NaxPt3O4-type structure (space group Oh3-Pm3n, a = 575.6 pm). The distribution of the oxydation states of Pd with respect to the lattice positions 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 trigonale SrO6 – Prismen verknüpfen Kagome-Netze im Strontium-Manganat(IV)-Tellurat(VI): SrMnTeO6 / Kagomé Layers Connected by Isolated Trigonal SrO6 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTeO6 L

1998 ◽  
Vol 53 (3) ◽  
pp. 283-286 ◽  
Author(s):  
L. Wulff ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Hexagonal Symmetry ◽  
Unknown Compound ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of the hitherto unknown compound SrMnTeO6 have been prepared from Sr(OH)2 ·8H2O , MnCO3(aq) and TeO2 in air by crystallization below the melt range. X-ray investigations showed hexagonal symmetry, space group D33h -P6̅2m, lattice constants a = 5.143( 1), c = 5.384(2) A, Z = 1. SrMnTeO6 is characterized by staggered [(Mn/Te)6O18] Kagome layers along [001]. These layers are connected by Sr2+ ions, resulting in SrO6 prisms isolated from each other. The structure is discussed with respect to the connection of Kagome nets in the quaternary oxides of the Ba3Ln4O9 type.

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