Synthese und Kristallstruktur des Lanthan-Titanat-Tellurats LaTi(Ti0,25Te0,75)O6 und seine Verwandtschaft mit PbSb2O6 und Sr(MnTe)O6/Synthesis and Crystal Structure of the Lanthanum Titanate Tellurate LaTi(Ti0.25Te0.75)O6 and its Relationship to PbSb2O6 and Sr(MnTe)O6

1998 ◽  
Vol 53 (2) ◽  
pp. 149-152 ◽  
Author(s):  
L. Wulff ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Oxygen Ions ◽  
Lanthanum Titanate ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of LaTi(Ti0.25Te0.75)O6 have been prepared by solid state reactions. X-ray investigations led to trigonal symmetry, space group C31-P3 , a = 5.141(10), c = 5.218(10) Å, Z = 1. The compound is characterized by a predominantly ordered distribution of Ti4+ and Te6+. Typical features of the crystal structure are staggered layers containing edge connected TiO6 and (Ti,Te)O6 octahedra. The layers are connected by La3+ ions receiving an octahedral coordination by the surrounding oxygen ions. The relationships to the PbSb2O6 type and the recently described compound Sr(MnTe)O6 are discussed.

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.

Kantenverknüpfte VO6-0ktaeder und PO4-Tetraeder in BaCa(VO)(PO4)2 / Edge-Connected VO6 Octahedra and PO4 Tetrahedra in BaCa(VO)(PO4)2

1997 ◽  
Vol 52 (5) ◽  
pp. 549-552 ◽  
Author(s):  
S. Meyer ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Melting Point ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Monoclinic Symmetry ◽  
X Ray ◽  
Vanadyl Group ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of the new compound BaCa(VO)(PO4)2 have been prepared by solid state reactions below the melting point of the reactants in evacuated quartz tubes. X-ray investigations led to monoclinic symmetry, space group C2h5 - P21/c, a = 7.300(1), b = 7.053(1), c = 14.460(1) Å, β = 101,43(1)°, Z = 4. The crystal structure is characterized by layers of corner-and edge-connected PO4 tetrahedra and VO1+5 octahedra. There is an unusually short O(1)-O(4) distance in a VO6 octahedron of 2.44 Å associated with the sharing of edges with PO4 tetrahedra. The short V-O distance of 1.61 Å indicates a vanadyl group.

Cd0,73Cu0,27V2O6: Eine Verbindung mit Branneritstruktur / Cd0 ,73Cu0,27V2O6: A Compound with Brannerite Structure

1994 ◽  
Vol 49 (7) ◽  
pp. 927-930 ◽  
Author(s):  
S. Münchau ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
X Ray ◽  
Jahn Teller ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Cd0.73Cu0.27V2O6 were prepared by solid state reactions. X-ray investigations lead to monoclinic symmetry, space group C32h-C2/m , a = 9.339, b = 3.5604, c = 6.893 Å, β = 111.85°, Z = 2. It belongs to the Brannerite structure, showing a statistical distribution of Cd2+ and Cu2+ on one point position. The crystal structure of Brannerites is discussed with respect to the distorted O2- octahedra around V5+ and the influence of the Jahn-Teller active Cu2+ ion to the shortened M2+O6 octahedra.

Über ein cadmiumreiches Orthovanadat Ba2,5Cd11(VO4)9 mit Cadmium in oktaedrischer und tetragonal pyramidaler Koordination / On a Cadmium Rich Orthovanadate Ba2,5Cd11(VO4)9 Showing Cadmium in Octahedral and Square Pyramidal Coordination

1997 ◽  
Vol 52 (8) ◽  
pp. 989-993 ◽  
Author(s):  
B Mertens ◽  
Hk Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Three Dimensional ◽  
Lattice Energy ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba2,5Cd11(VO4)9 have been prepared by solid state reactions. The new compound crystallizes with orthorhombic symmetry, space group D142h-Pbcn, a = 20.842(6), b = 13.471(3), c = 11.838(9) Å, Z = 4. The crystal structure is characterized and dominated by CdO6 octahedra and unusual square pyramids of O2- around Cd2+ forming a three-dimensional [Cd11O36] network. The interstices are occupied by V5+ and Ba2+ ions. This results in VO4 tetrahedra and irregular BaO10 polyhedra isolated from each other. Occupation of the barium positions is deficient in agreement with the valence state V5+ and calculations of the coulomb terms of lattice energy.

Kristallstrukturuntersuchung am Barium-Yanadyl-Vanadat: Ba2(VO)V2O8 / Crystal Structure Investigation of the Barium Vanadyl-Vanadate: Ba2(VO)V2O8

1996 ◽  
Vol 51 (4) ◽  
pp. 489-492 ◽  
Author(s):  
J. Feldmann ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Structure Type ◽  
Solid State Reactions ◽  
Tetrahedral Coordination ◽  
Structure Investigation ◽  
Monoclinic Symmetry ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Ba2(VO)V2O8 have been prepared by solid state reactions of Ba2V2O7, V2O3 and V2O5 in sealed silica tubes. This compound crystallizes with monoclinic symmetry, space group C22 -P21, a = 8.1174(9), b = 5.9699(9), c = 9.2903(9) Å , β = 113.94(1)°, Z = 2. V 5+ shows tetrahedral coordination. V 4+ inside 1∞ [V (3)O4] chains is characterized by a square pyramidal coordination with a short apical V-O distance of 1.6 Å typically for vanadyl groups. Ba2(VO)V2O8 represents a new structure type and is not isotypic to Sr2(VO)V2O8.

scholarly journals Synthese und Kristallstruktur eines Alkali-Erdalkali-Kupfer-Halogeno-Oxovanadats: KBaCuV2O7Cl / Synthesis and Crystal Structure of an Alkaline Alkaline-Earth Halide Oxide of Copper and Vanadium: KBaCuV2O7Cl

1994 ◽  
Vol 49 (3) ◽  
pp. 355-359 ◽  
Author(s):  
F.-D. Martin ◽  
H. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Copper Ion ◽  
Tetragonal Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of KBaCuV2O7Cl have been prepared by a flux technique and investigated by X-ray analysis. The compound crystallizes with tetragonal symmetry, space group C24v-P4 bm, a = 8.8581, c = 5.4711 Å, Z = 2. The crystal structure shows Cu2+ within a one sided strongly distorted CuO4Cl2 octahedron. The copper ion is shifted towards the nearer Cl- neighbour to form a CuO4Cl square pyramid. Two VO4 tetrahedra are connected to give stretched V2O7 double tetrahedra, and linked in planes via the oxygen corners of the CuO4Cl pyramids. The crystal structure and the structure of the complex BaO8Cl2 polyhedron are discussed.

Ba4Mn2Ag2O(As04)4 , ein Barium-Mangan-Oxid-Arsenat mit nichtlinearen O-Ag-O-Hanteln / Ba4Mn2Ag2O(AsO4)4, a Barium Manganese Oxide-Arsenate Showing Nonlinear O-Ag-O Dumbbells

1998 ◽  
Vol 53 (5-6) ◽  
pp. 512-516 ◽  
Author(s):  
M. Staack ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Bond Angle ◽  
Magnetic Measurements ◽  
Solid State Reactions ◽  
Metallic Silver ◽  
Monoclinic Symmetry ◽  
X Ray ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Ba4Mn2Ag2O(AsO4)4 have been prepared by solid state reactions using metallic silver as reactant. X-ray techniques led to monoclinic symmetry, space group D2h-P2,/m, a = 8.739(2), b = 5.912(1), c = 9.440(2) Å, β = 115.21(1)°, Z = 1. The crystal structure is characterized by O-Ag-O dumbbells, bond angle = 165,3°, containing one oxygen atom not associated with the arsenate groups. Considering these facts Ba4Mn2Ag2O(AsO4)4 may be seen as an oxide-arsenate or an oxoargentate(I)-arsenate. Assuming the oxidation state +II for manganese, as confirmed by magnetic measurements, the compound has an oxygen deficite which was accounted for by a split position model.

Synthese und Kristallstruktur der ersten zinkhaltigen Pyroborate Ni1,5Zn0,5(B2O5) und Co1,5Zn0,5(B2O5) / Synthesis and Crystal Structure of the First Zinc Containing Pyroborates Ni1,5Zn0,5(B2O5) and Co1,5Zn0,5(B2O5)

1995 ◽  
Vol 50 (10) ◽  
pp. 1445-1449 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Oxygen Coordination ◽  
Octahedral Oxygen ◽  
Symmetry Space ◽  
Symmetry Space Group

The first zinc containing pyroborates Ni1,5Zn0,5(B2O5) (A ) and Co1,5Zn0,5(B2O5) (B) were prepared by using a B2O3 flux technique. Single crystals were investigated by X-ray diffraction and showed triclinic symmetry, space group Ci1-P1̅. The structures are isotypic to Co2(B2O5) with the lattice parameters (A ) a = 331.28(6), b = 613.87(11), c = 922.2(2), α = 104.067(11) °, β = 90.672(13) °, γ = 92.413(12) ° and (B) a = 315.89(2), b = 612.84(6), c = 927.72(6), α = 104.103(7) °, β = 91.020(6) °, γ = 92.540(7) °, Z = 2. All metal point positions show an octahedral oxygen coordination and a partly statistical distribution of Zn2+ and Ni2+ or Co2+, respectively. Isolated nearly planar B2O5 units connect ribbons consisting of edge sharing metal octahedra.

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.

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.

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