Structures and Phase Transitions in Rb2MoO4and Rb2WO4

Autor:	Takeo Tojo, Keisuke Nomura, Yukihiko Kawamura, Masahiko Tanaka, Hiroyuki Mashiyama, Hirotake Shigematsu, Hitoshi Kawaji, Yoshitaka Matsushita, Tooru Atake, Katsura Nishiyama, Tatsuki Miyoshi
Rok vydání:	2011
Předmět:	Phase transition Materials science Condensed matter physics Ferroics Crystal structure Neutron scattering Condensed Matter Physics Heat capacity Synchrotron Electronic Optical and Magnetic Materials law.invention law Orthorhombic crystal system Monoclinic crystal system
Zdroj:	Ferroelectrics. 414:195-200
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150193.2011.577339
Popis:	The structural phase transitions of Rb2MoO4 and Rb2WO4 have been reinvestigated with the use of heat capacity measurement and synchrotron X-ray and neutron scattering techniques. In Rb2MoO4, the existence of polymorphous structures has been confirmed. These crystal structures at 290 K are a monoclinic -K2MoO4 type one and an orthorhombic -K2SO4 type one. In an annealed sample, two typical first-order-type anomalies were observed at 783 and 752 K. Furthermore, new -type anomaly equivalent to the second normal-incommensurate phase transition in A2BO4-type ferroelectrics was observed at 223 K. On the other hand, the crystal structure at 290 K of Rb2WO4 was a monoclinic -K2MoO4 type one and no phase transition was detected down to 8 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b1b937c3500aeff6a18e66f33545eb5c https://doi.org/10.1080/00150193.2011.577339 Zobrazit plný text záznamu