Zur Kristallstruktur von SrLaNiO4 / On the Crystal Structure of SrLaNiO4

1979 ◽  
Vol 34 (3) ◽  
pp. 378-379 ◽  
Author(s):  
H. Pausch ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Laser Radiation ◽  
X Ray ◽  
Pressure Method ◽  
Oxygen Coordination ◽  
High Oxygen Pressure ◽  
Geometrical Effect ◽  
Octahedral Oxygen ◽  
Group D ◽  
Octahedral Distortion

Abstract Single crystals of SrLaNiO4 were prepared with a new high temperature and high oxygen pressure method (CO2-Laser radiation). The X-ray investigation shows, that this compound belongs to the K2NiF4-type (a - 381.3; c = 1268.7 pm; space group D174h-I4/mmm), with a stretched octahedral oxygen coordination around Ni3+. The octahedral distortion can only be explained by a geometrical effect.

Multianvil High-Pressure Synthesis And Crystal Structure Of β-YbBO3

2001 ◽  
Vol 56 (8) ◽  
pp. 697-703 ◽  
Author(s):  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Title Compound ◽  
Variable Parameters ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Oxygen Coordination ◽  
Distorted Octahedral ◽  
Pressure Synthesis ◽  
Octahedral Oxygen

β-Ytterbium borate (β-YbBO3) was synthesized under high-pressure in a Walker-type multianvil apparatus at 2.2 GPa and 1400 °C. The title-compound crystallizes in the trigonal calcite structure, space group R3̄̄c. Single crystal X-ray data yielded a = 492.1(2), c = 1630.5(9) pm, wR2 = 0.0344 for 165 F2 values and 11 variable parameters. Within the trigonal planar BO3 groups the B-O distance is 137.8(4) pm. The ytterbium atoms have a slightly distorted octahedral oxygen coordination (Yb-O: 224.4(2) pm)

High-pressure Synthesis and Crystal Structure of the Vanadium Orthoborate VBO3

2008 ◽  
Vol 63 (6) ◽  
pp. 713-717 ◽  
Author(s):  
Almut Haberer ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Oxygen Coordination ◽  
High Pressure High Temperature ◽  
Distorted Octahedral ◽  
Pressure Synthesis ◽  
Octahedral Oxygen

The vanadium orthoborate VBO3 was synthesized under high-pressure / high-temperature conditions of 7.5 GPa and 1250 °C in a Walker-type multianvil apparatus. The crystal structure was determined on the basis of single crystal X-ray diffraction data, collected at r. t. The title compound crystallizes in the trigonal calcite structure, space group R3̄c, with the lattice parameters a = 462.0(1) and c = 1450.9(3) pm. Within the trigonal planar BO3 groups, the B-O distance is 138.8(3) pm. The vanadium atoms have a slightly distorted octahedral oxygen coordination (V-O: 202.3(2) pm).

Synthese und röntgenographische Charakterisierung von zwei neuen Verbindungen des Ludwigit-Strukturtyps: Co5Sn(BO3)2O4 und Co5Mn(BO3 )2O4/Synthesis and X -Ray Characterization of Two New Compounds with Ludwigite-Structure: Co5Sn(BO3)2O4 and Co5Mn(BO3)2O4

1996 ◽  
Vol 51 (3) ◽  
pp. 305-308 ◽  
Author(s):  
Anne Utzolino ◽  
Karsten Bluhm
Keyword(s):  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxygen Coordination ◽  
New Compounds ◽  
Octahedral Oxygen ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract The compounds Co5Sn(BO3)2O4 (I) and Co5Mn(BO3)2O4 (II) were prepared by using a B2O3 flux technique. Single crystals were investigated by X-ray diffraction and showed orthorhombic symmetry, space group D2h9-Pbam (No. 55), I a = 944.4; b = 1233.8; c = 310.5 pm; Z = 2 and II a = 925.07; b = 1241.67; c = 305.24 pm; Z = 2. Both compounds are isotypic to the mineral Ludwigite. All metal point positions show an octahedral oxygen coordination. Co2+ and M4+ (M = Sn or Mn) occupy one point position statistically. Both structures contain isolated, trigonal planar BO3 units and oxygen atoms that are not coordinated to boron.

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.

Neue Einsichten zur Stabilisierung des Hulsit-Strukturtyps am Beispiel von MnII,2MnIII(BO3)O2 und MnIISrMnIII(BO3)O3 / New Insights into the Stabilization of the Hulsite Structure During Crystal Structure Determination of MnII2MnIII(BO3)O2 and MnIISrMnIII(BO3)O2

1996 ◽  
Vol 51 (10) ◽  
pp. 1433-1438 ◽  
Author(s):  
Anne Utzolino ◽  
Karsten Bluhm
Keyword(s):  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Oxygen Coordination ◽  
Octahedral Oxygen ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

The compounds MnII2MnIII(BO3)O2 (I) and MnIISrMnIII(BO3)O2 (II) were prepared by using a B2O3 flux technique. Single crystals were investigated by X-ray diffraction. I showed orthorhombic symmetry, space group D92h - Pbam (No. 55), a = 926.0; b = 1241.5; c = 304.96pm ; Z = 4 and II monoclinic symmetry, space group C12h - P2/m (No. 10), a = 1107.5; b = 311.04; c = 542.93 pm, β = 95,10(2)°; Z = 2. MnII2MnIII(BO3)O2 i is isotypic with the mineral Ludwigite while MnnIISrMnmIII(BO3)O2 is isostructural with the mineral Hulsite. In the structure of MnII2Mnlll(BO3)O2 (I) all metal point positions showed octahedral oxygen coordination, one point position is occupied by Mn3+ . The structure of Mnll2Sr2Mnlll2(BO3)2O4 (II) contains five octahedrally coordinated metal sites, three of them statistically occupied by Mn2+ or Mn 3+ and Sr2+. The incorperation of Sr2+ seems to be responsible for the Hulsite structure. Both structures contain isolated, trigonal planar BO3 units and oxygen atoms that are not coordinated to boron.

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.

scholarly journals Different Roles of Ce3+ Optical Centers in Oxyorthosilicate Nanocrystals at X-ray and UV Excitation

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 114 ◽  
Author(s):  
Vladyslav Seminko ◽  
Pavel Maksimchuk ◽  
Iryna Bespalova ◽  
Yuri Malyukin
Keyword(s):  
Crystal Structure ◽  
Dominant Role ◽  
Luminescence Spectra ◽  
Photoluminescence Intensity ◽  
Bulk Crystals ◽  
Space Group ◽  
X Ray ◽  
Oxygen Coordination ◽  
Cation Sites

Luminescence properties of Lu2SiO5:Ce3+ and Y2SiO5:Ce3+ nanocrystals were studied using photo- and X-ray luminescence techniques. The crystal structure of Re2SiO5 nanocrystals (P21/c space group) differs from the crystal structure of Re2SiO5 bulk crystals (C2/c space group) with 9- and 7-oxygen-coordinated cation positions instead of 6- and 7-coordinated ones observed for Re2SiO5 bulk crystals. Two optical centers (Ce1 and Ce2) were observed for Re2SiO5:Ce3+ nanocrystals originating from cerium ions substituting 9- and 7-oxygen-coordinated cation sites. Preferential substitution of larger cation sites by cerium ions leads to higher photoluminescence intensity of Ce1 centers, however, Ce2 centers are the main centers for electron-hole recombination, so only Ce2 band is observed in X-ray luminescence spectra. The features of oxygen coordination of Ce1 and Ce2 centers and high content of oxygen vacancies in Re2SiO5:Ce3+ nanocrystals can provide preferential trapping of electrons near Ce2 centers, and therefore, the dominant role of Ce2 band in X-ray luminescence spectra.

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.

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

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.

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