Premium
Analysis of phase transition and expansion behaviour of Al 2 (WO 4 ) 3 by temperature‐regulated X‐ray diffraction
Author(s) -
Hashimoto Takuya,
Sugimoto Takayuki,
Omoto Kazuki,
Kineri Nanami,
Ogata Yoichiro,
Tsuda Kenji
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200880258
Subject(s) - monoclinic crystal system , orthorhombic crystal system , diffraction , thermal expansion , superstructure , phase transition , crystallography , materials science , electron diffraction , x ray crystallography , phase (matter) , lattice constant , transition temperature , chemistry , analytical chemistry (journal) , condensed matter physics , crystal structure , thermodynamics , optics , physics , composite material , superconductivity , organic chemistry , chromatography
X‐ray diffraction measurements of Al 2 (WO 4 ) 3 were carried out under various temperatures from 123 K to 373 K. Diffraction patterns above 273 K and below 253 K could be successfully explained as orthorhombic Pbcn (No. 60) and monoclinic P2 1 /n (No. 14) with superstructure, respectively, which were in agreement with the results of convergent‐beam electron diffraction. Thermal expansion of low‐temperature monoclinic phase and slight shrinkage of high‐temperature orthorhombic phase were observed from the temperature dependence of lattice constants and molar volume, showing agreement with the result of dilatometry. It is revealed that abrupt expansion of Al 2 (WO 4 ) 3 at the structural phase transition is attributed to an abrupt increase of the c ‐axis, which is parallel to the 2 1 screw axis and perpendicular to the n‐glide plane. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)