Structure of Ca/sub 0. 3/Sr/sub 0. 7/Cl/sub 2/ and Ca/sub 0. 46/Sr/sub 0. 54/Cl/sub 2/ by the x-ray Rietveld refinement procedure

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(88)90314-3· OSTI ID:7044794

Losocha, W; Eick, H A

The structures of tetragonal Ca/sub 0.3/Sr/sub 0.7/Cl/sub 2/ and orthorhombic Ca/sub 0.46/Sr/sub 0.54/Cl/sub 2/ were determined from X-ray powder diffraction data by the Reitveld line-profile fitting procedure. The tetragonal phase crystallizes in space group P4/n (SrBr/sub 2/-type structure) with a = 10.898(2) and c = 6.744(2) A. The cations are distributed randomly over the 8g and 2c sites. For this structure R/sub f/ = 0.095 and R/sub wp/ = 0.168. The orthorhombic phase crystallizes in space group Pbca (SrI/sub 2/-type structure) with a = 13.421(5), b = 7.053(3), and c = 6.817(2) A. The R/sub f/ and R/sup wp/ factors are 0.081 and 0.164, respectively. Interatomic distances for both phases are reported and compared with those of related structures. The CaCl/sub 2/-SrCl/sub 2/ system is found to exhibit in the 0-25 mole% region the CaCl/sub 2/..sqrt.. and ..cap alpha..-PbO/sub 2/-type structures rather than the CaCl/sub 2/- and SrI/sub 2/-type structures reported previously.

• Research Organization: Michigan State Univ., East Lansing (USA)
• OSTI ID: 7044794
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 75:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LATTICE PARAMETERS
NUMERICAL DATA
ORTHORHOMBIC LATTICES
SCATTERING
SPACE GROUPS
STRONTIUM CHLORIDES
STRONTIUM COMPOUNDS
TETRAGONAL LATTICES
X-RAY DIFFRACTION