Eine synthetische Spezies zum Mineral Howardevansit mit Eisen anstelle von Kupfer: NaFe3V3O12 / A Synthetic Species of the Mineral Howardevansite with Copper Displacing Iron: NaFe3V3O12

1995 ◽  
Vol 50 (1) ◽  
pp. 51-55 ◽  
Author(s):  
F.-D. Martin ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Melting Point ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Solid State Reaction ◽  
Space Group ◽  
Triclinic Symmetry ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of NaFe3V3O12 have been prepared by solid state reaction below the melting point of the reaction mixture. This compound is isotypic to the mineral Howardevansite but shows lower triclinic symmetry, space group C11–P1, a = 6.757(2), b = 8.155(2), c = 9.816(3) Å, α = 106.05(2), β = 104.401(9), γ = 102.09(2)°, Z = 2. The acentric space group is caused by the sodium positions, all other atoms comply with the space group P̄ of Howardevansite. The different ions are coordinated by O2- forming VO4 tetrahedra, FeO6 octahedra, trigonal FeO5 bipyramids and irregular NaO5 and NaO7 polyhedra, respectively. The crystal chemistry is discussed with respect to Howardevansite.

Ein Beitrag zur Kristallchemie von Verbindungen mit Johillerit-Struktur: KCo3Cu(As2,58V0,42)O12 / On the Crystal Chemistry of Compounds with Johillerite Structure: KCo3Cu(As2,58V0,42)O12

1994 ◽  
Vol 49 (11) ◽  
pp. 1463-1466 ◽  
Author(s):  
D. Frerichs ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Melting Point ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Structure Type ◽  
Solid State Reactions ◽  
Tetrahedral Coordination ◽  
Monoclinic Symmetry ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of KCo3Cu(As2.58V0.42)O12 were prepared by solid state reactions below the melting point of the reaction mixture (K2CO3, CuO, COC2O4, V2O5 and 3 As2O5 · 5H2O). It crystallizes with monoclinic symmetry, space group C62h-C2/c, a = 12.207, b = 12.730, c = 6.811 Å, β = 113.69°, Z = 4. The structure type is characterized by isolated twisted-square CuO4-polygons, CoO6-octahedra and a special 4+4-coordination of the potassium ion. As5+ and V5+ are in tetrahedral coordination with a partly statistical distribution of these ions.

Ein Cadmium-Kupfer-Phosphat mit einfach überkappten trigonalen CdO6-Prismen-Netzen: Cd1.35Cu1.65(PO4)2

1996 ◽  
Vol 51 (2) ◽  
pp. 229-232 ◽  
Author(s):  
S. Münchau ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Melting Point ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
Symmetry Space ◽  
Light Green ◽  
Symmetry Space Group

Abstract Single crystals of Cd1.35Cu1.65(PO4)2 have been prepared by solid state reactions below the melting point of the starting compounds. The light green crystals crystallize with monoclinic symmetry, space group C52h-P21/c , a = 9.062(2), b = 11.669(2), c = 5.950(2) Å , β = 97.88(2)°, Z = 4. Cd1.35Cu1.65(PO4)2 shows relationship to the mineral graftonite. The crystal structure is characterized by nets of corner connected Cd2O12 polyhedra. One point position is statistically occupied by Cd2+ and Cu2+ ions.

Isolierte MnCl6-Oktaeder im Oxohalogeno-Vanadat Ba5(Mg0,4Mn0,6)(V2O7)2MnCl6 / Isolated MnCl6 Octahedra in the Oxohalogeno Vanadate Ba5(Mg0,4Mn0,6)(V2O7)2MnCl6

1997 ◽  
Vol 52 (4) ◽  
pp. 457-461 ◽  
Author(s):  
R. Rettich ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Melting Point ◽  
Vanadium Oxide ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba5(Mg0,4Mn0,6)(V207)2MnCl6 have been prepared by solid state reactions of MgCO3, Mn2O3, V2O5 and BaCl2·2H2O below the melting point of BaCl2. The new vanadium oxide chloride crystallizeswith monoclinic symmetry, space group C42h-P2/c, a = 13.345(4), b = 5.711(2), c = 15.859(4) Å, β = 113.69(2)°, Z = 2. Special features of the crystal structure are isolated MnCl6 octahedra and layers created by divanadat groups and (Mg,Mn)O6 octahedra. The 2∞ [(Mg,Mn)V2O7] nets of Ba3(Mg0,4Mn0,6)(V2O7)2MnCl6 are discussed with respect to other oxohalogeno vanadates Containing divanadate groups.

Synthese und Kristallstruktur von NaMgl,64Cu0,36V3O10/ Synthesis and Crystal Structure of NaMgl,64Cu0,36V3O10

1994 ◽  
Vol 49 (10) ◽  
pp. 1329-1333 ◽  
Author(s):  
F.-D. Martin ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Melting Point ◽  
Single Crystals ◽  
Structure Type ◽  
Statistical Distribution ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
Triclinic Symmetry ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of NaMg1.64Cu0.36V3O10 have been prepared by heating mixtures of Na2CO3, MgCO3, CuO and V2O5 above the melting point. The yellow crystals show triclinic symmetry, space group Ci1-P1̅, a = 6.726(8), b = 6.743(7), c = 9.625(2) Å, α = 100.705(9), β = 104.57(1), γ = 101.700(9)°, Z = 2. NaMg1.64Cu0.36V3O10 represents a new structure type showing V3O10 groups, a statistical distribution of Mg2+ and Cu2+ on two point positions, and Na+ in an irregular coordination.

Über das erste Oxopalladat-Arsenat: KMg3Pd(AsO4)3 / On the First Oxopalladat-Arsenate: KMg3Pd(AsO4)3

1995 ◽  
Vol 50 (6) ◽  
pp. 867-870 ◽  
Author(s):  
D. Frerichs ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Melting Point ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Point Of View ◽  
Solid State Reactions ◽  
Monoclinic Symmetry ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of KMg3Pd (AsO4)3 have been p repared by solid state reactions below the melting point of the reaction mixture. This compound crystallizes isotypic to the mineral Johilleriteo with monoclinic symmetry, space group C 2h6 -C 2/c , a = 12.098(3) Å, b = 12.853(5) Å , c = 6.688(3) Å, β = 112.92(3)°, Z = 4. The crystal structure is characterized by AsO4 tetrahedra, isolated planar but twisted PdO4 polygons, MgO6 octahedra and a 2+4+2- coordination of potassium . From the point of view of crystal chemistry KMg3Pd (AsO4)3 both belongs to the arsenates and oxopalladates(II).

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.

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.

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 ▪.

Zur Kristallchemie eines Silber-Cadmium-Oxovanadats: AgCdVO4 / On the Crystal Chemistry of a Silver Cadmium Oxovanadate: AgCdVO4

1995 ◽  
Vol 50 (5) ◽  
pp. 703-706 ◽  
Author(s):  
S. Münchau ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Crystal Chemistry ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
Olivine Structure ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group ◽  
Light Orange

Abstract Single crystals of AgCdVO4 have been prepared in closed silver tubes using V2O5 as a flux. The light-orange crystals show orthorhombic symmetry, space group D162h-Pnma, a = 9.786(2), b = 6.994(1), c = 5.439(1) Å, Z = 4. The hitherto unknown AgCdVO4 is related to the Olivine structure but isotypic to Ag2CrO4 and NaCd4(VO4)3 respectively. The differences in crystal chemistry between the Olivine type, NaCd4(VO4)3 and AgCdVO4 are discussed.

Ein Beitrag zur Kristallchemie der Alkali-Erdalkalimetall-Oxovanadate: Synthese und Struktur von K3CaV5O15/A Contribution to the Crystal Chemistry of Alkaline-Alkaline-Earth Oxovanadates: Synthesis and Structure of K3CaV5O15

1995 ◽  
Vol 50 (2) ◽  
pp. 243-246 ◽  
Author(s):  
F.-D. Martin ◽  
Hk. Miiller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Crystal Chemistry ◽  
Alkaline Earth ◽  
Structure Type ◽  
Orthorhombic Symmetry ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of K3CaV5O15 have been prepared by crystallization from melts. The com pound shows a new structure type with orthorhombic symmetry, space group D2h21-Cmma, a = 25.953(5), b = 15.688(3), c = 7.804(4) Å, Z = 8. Typical features of K3CaV5O15 are isolated cyclic V4O12 and V6O18 groups of corner sharing VO4 tetrahedra.

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