Published September 1997 | Version v1
Journal article Metadata-only

Crystal structures of double vanadates Ca9R(VO4)7: I. R=La, Pr, and Eu

Creators

  • 1. Moscow State University, Moscow, Vorob'evy gory, 119899 (Russian Federation)
  • 2. Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 (Russian Federation)

Description

The crystal structures of Ca9R(VO4)7 [R=La (I), Pr (II), and Eu (III)] are determined by full-profile analysis. The compounds crystallize in the trigonal system (sp. gr. R3c, Z=6). The unit cell parameters are as follows: (I) a=10.8987(5) and c=38.147(1)A, V=3924.1(3) A3; (II) a=10.8808(7) and c=38.135(1)A, V=3910.0(3) A3; and (III) a=10.8651(5) and c=38.089(1)A, V=3894.0(3) A3. Calcium and rare-earth metal cations occupy statistically three sites in the structure. The site occupancies depend on the radius of the rare-earth cations. In row compounds with rare-earth cations from La to Eu, the occupancy of the M(1)and M(2) sites increases and the occupancy of the M(3) site decreases

Additional details

Identifiers

URL
https://www.pleiades.online/contents/cryst/cryst5_97v42cont.htm;

Publishing Information

Journal Title
Crystallography Reports
Journal Volume
42
Journal Issue
5
Journal Page Range
p. 751-757
ISSN
1063-7745
CODEN
CYSTE3

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
35075870
Subject category
S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Translation
Descriptors DEI
CALCIUM COMPOUNDS; CATIONS; CRYSTALLOGRAPHY; EUROPIUM COMPOUNDS; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; PRASEODYMIUM COMPOUNDS; SYMMETRY; TRIGONAL LATTICES; VANADATES; X-RAY DIFFRACTION
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CHARGED PARTICLES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; IONS; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS; VANADIUM COMPOUNDS

Optional Information

Notes
Translated from Kristallografiya, ISSN 0023-4761, 42, 818-824 (September-October 1997); (c) 1997 MAIK/Interperiodika