Growth and defect crystal structure of CdF2 and nonstoichiometric Cd1−x R x F2+x phases (R = rare earth and In). Part 3. Crystal structure of as-grown Cd0.90 R 0.10F2.10 (R = Sm-Lu, Y) single crystals

2005 ◽  
Vol 50 (2) ◽  
pp. 203-216 ◽  
Author(s):  
E. A. Sul’yanova ◽  
A. P. Shcherbakov ◽  
V. N. Molchanov ◽  
V. I. Simonov ◽  
B. P. Sobolev
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Defect Crystal

Über das Erdalkalimetall-Lanthanoid-Kupfer-Oxomolybdat (Cu0,22Mg0 ,78)BaNd2Mo4O16/The Alkaline Earth Rare Earth Copper-Oxomolybdate (Cu0.22Mg0.78)BaNd2Mo4O16

1995 ◽  
Vol 50 (4) ◽  
pp. 577-580 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Three Dimensional ◽  
Space Group ◽  
X Ray ◽  
Ray Methods

Single crystals of (Cu0.22Mg0.78)BaNd2Mo4O16 have been prepared by crystallization from melts and investigated by X-ray methods. The compound crystallizes monoclinically, space group C62h - C12/c1, Z = 4, a = 5.351(1), b = 12.891(2), c = 19.391(4) Å,β = 90.899(14)° and is isotypic to CuKHo2Mo4O16. The crystal structure is dominated by BaO10 and NdO8 polyhedra forming a three-dimensional polyhedra network, which is filled by axially distorted (Cu,Mg)O6 octahedra and MoO4 tetrahedra.

Zur Kenntnis eines Barium-Lanthanoid-Oxomanganats(IV, V): Ba3ErMn2O9 / On a Barium Rare-Earth Oxomanganate(IV, V): Ba3ErMn2O9

1994 ◽  
Vol 49 (9) ◽  
pp. 1277-1281 ◽  
Author(s):  
Ch. Rabbow ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
High Temperature ◽  
Metal Oxides ◽  
Single Crystals ◽  
Precious Metal ◽  
Orthorhombic Symmetry ◽  
High Temperature Reactions ◽  
Symmetry Space ◽  
Symmetry Space Group

High temperature reactions of BaCO3/MnO/Er2O3 (3:1:1) led to single crystals of Ba3ErMn2O9. The product shows the structure of the hexagonal precious metal oxides Ba3LnRu2O9, but crystallizes with orthorhombic symmetry, space group C122v-Cmc21, a = 5.823 Å, b - 10.099 Å, c = 14.409 Å; Z = 4. The crystal structure is characterized by ErO6 octahedra, Mn2O9 face shared double octahedra and Ba2+ within cuboctahedral and anticuboctahedral coordination by O2-, respectively. In contrast to precious metal oxides the Mn-Mn distances inside the Mn2O9 double octahedra are elongated

Elektroneutrale Pb4O4 -Heterokubaneinheiten in den Aluminatsodalithen Ln4[Al12O24](Pb4O4)2 (Ln = Nd, Sm) / Electrically Neutral Pb4O4 Heterocubane Units in Aluminate Sodalites Ln4[Al12O24](Pb4O4)2 (Ln = Nd, Sm)

1997 ◽  
Vol 52 (4) ◽  
pp. 449-452 ◽  
Author(s):  
J.-P. Werner ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Rare Earth Ions ◽  
Neutral Network ◽  
Cubic Symmetry ◽  
Space Group ◽  
Coordination Spheres ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of Ln4[Al12O24](Pb4O4)2 (Ln = Nd, Sm) have been prepared by flux techniques. The compounds crystallize with cubic symmetry, space group Oh-Pn3̄m, aNd = 9.514(1), aSm = 9.481(1) Å, Z = 1. The crystal structure is characterized by a [Al12O24]12- framework. Four of the eight six-membered rings of AlO4-tetrahedra per sodalite cage are centered by Ln3+ ions. The cages of the resulting electrically neutral network are filled with [Pb4O4]±0 heterocubane units. Oxygen of the heterocubane units completes the coordination spheres of the rare earth ions to hexagonal bipyramids.

Ein Beitrag zur Kristallchemie dreiwertiger Seltenerdoxide Zur Stabilisierung der monoklinen B-Form / About the Crystal Chemistry of Three-Valent Rare Earth Oxides The Stabilisation of the Monoclinic B-Modification

1977 ◽  
Vol 32 (5) ◽  
pp. 495-498 ◽  
Author(s):  
W. Muschick ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
High Temperature ◽  
Single Crystals ◽  
Rare Earth Oxides ◽  
Temperature Reaction ◽  
Crystal Data ◽  
X Ray ◽  
High Temperature Reaction ◽  
Type Crystal

Single crystals of 1—x Ho2O3 : xCaO (x = 0.07), CaHoO2.5 (A) and Ca0.5Ho1.5O2.75 (B) were prepared by high temperature reaction and investigated with X-ray single crystal data. It can be shown that small amounts of CaO stabilize the monoclinic B-Typ of rare earth oxides. Phase (A) and (B) cannot be seen as a stabilized B-type crystal because they have an new crystal structure with space groupC22h–P 21/m, a = 656.6, b = 356.7, c = 529.4 pm, β = 92.3°; a = 650.2, b = 352.4, c = 584.5, β = 92.3°.

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.

scholarly journals Pr5Si3N9

2009 ◽  
Vol 65 (6) ◽  
pp. i43-i43 ◽  
Author(s):  
Saskia Lupart ◽  
Wolfgang Schnick
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Radio Frequency ◽  
Single Crystals ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Mirror Plane ◽  
Three Dimensional Structure ◽  
A Chain ◽  
Branched Chains

Single crystals of Pr5Si3N9, pentapraseodymium trisilicon nonanitride, were obtained by the reaction of elemental praseodymium with silicon diimide in a radio-frequency furnace at 1873 K. The crystal structure consists of a chain-like Si—N substructure of corner-sharing SiN4tetrahedra. An additionalQ1-type [SiN4] unit is attached to every second tetrahedron directed alternately in opposite directions. The resulting branched chains interlock with each other, building up a three-dimensional structure. The central atoms of theQ1-type [SiN4] unit and of its attached tetrahedron are situated on a mirror plane, as are two of the four crystallographically unique Pr3+ions. The latter are coordinated by six to ten N atoms, with Pr—N distances similar to those of other rare earth nitridosilicates.

NdClSeO3 and ErClSeO3: First Chloride-Selenites of the Rare Earth Elements

2002 ◽  
Vol 57 (12) ◽  
pp. 1414-1418 ◽  
Author(s):  
Mathias S. Wickleder
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Three Dimensional ◽  
Chloride Ions ◽  
Dimensional Structure ◽  
Electron Pairs ◽  
Dimensional Network ◽  
Stereochemical Activity ◽  
Oxygen Atoms

Violet single crystals of NdClSeO3 (Pnma, Z = 8, a = 1115.3(2), b = 535.19(6), c = 1356.8(1) pm, Rall = 0.0281) were obtained from the reaction of Nd2O3, NdCl3, and SeO2 in evacuated silica ampoules. The analogous procedure using Er2O3 and ErCl3 led to pink single crystals of ErClSeO3 (Pnma, Z = 4, a = 721.8(1), b = 692.2(1), c = 874.3(2) pm, Rall = 0.0305). The crystal structure of NdClSeO3 contains two crystallographically different neodymium ions. Nd(2)3+ is coordinated by four oxygen atoms and four chloride ions while eight oxygen atoms and one Cl− ion are connected to Nd(1)3+. The linkage of the polyhedra leads to a three-dimensional structure. In the structure of ErClSeO3 the Er3+ ion is coordinated by two Cl− ions, three O-monodentate SeO32− and one O,O-chelating SeO32− groups. The [ErO5Cl2] polyhedra can be seen as pentagonal bipyramids, which are connected in the [010] direction via opposite edges of oxygen atoms to infinite chains. These are further linked via chloride ions to give a three-dimensional network. In both crystal structures a prominent stereochemical activity of the lone electron pairs of the selenite ions can be observed.

Synthese und Kristallstruktur von Lanthanoidzinkboraten LnZn(B5O10) mit Ln = Ce, Nd, Tb / Synthesis and Crystal Structure of Rare Earth Zinc Borates LnZn(B5O10) with Ln = Ce, Nd, Tb

1996 ◽  
Vol 51 (5) ◽  
pp. 671-676 ◽  
Author(s):  
Silke Busche ◽  
Karsten Bluhm
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Lattice Parameters ◽  
Two Dimensional ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
New Compounds

Single crystals of the new compounds LnZn(B5O10) (Ln = (A) Ce3+, (B) Nd3+, (C) T b3+) were obtained by using a B2O3 flux technique. X-ray investigations led to space group C2h5-P21/n (Nr. 14) with lattice parameters: (A) a = 874.5(1), b = 761.4(1), c = 950.0(1), β = 92.80(1)°, (B) a = 868.6(2), b = 760.9(2), c = 946.0(2), β = 92.99(2)°, (C) a = 858.2(2), b = 760.5(2), c = 939.3(2), β = 93.56(2)°, Z = 4. The structure is isotypic with CoSm(B5O10) and is characterized by two-dimensional infinite 2∞ (B5O 10)5- ions. Ln is tenfold coordinated by oxygen, and Zn2+ occupies distorted ZnO6 polyhedra.

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