Hydrostatic pressure effect on phase transitions in perovskites with ammonium cations

Authors
Aleksandrov, KS Bartolome, J Gorev, MV Flerov, IN
Citation
Ks. Aleksandrov et al., Hydrostatic pressure effect on phase transitions in perovskites with ammonium cations, PHYS ST S-B, 217(2), 2000, pp. 785-791
Citations number
36
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI B-BASIC RESEARCH
ISSN journal
03701972 → ACNP
Volume
217
Issue
2
Year of publication
2000
Pages
785 - 791
Database
ISI
SICI code
0370-1972(200002)217:2<785:HPEOPT>2.0.ZU;2-O
Abstract
The pressure dependence of the structural phase transition temperature has been measured for the powder samples of NH4MgF3, NH4ZnF3, NH4MnF3, NH4CoF3, NH4CdF3, and NH4MnCl3 perovskites in the pressure range 0 to 600 MPa. It w as found that the values of dT(0)/dP are negative for the Mg, Zn. Co. Mn tr ifluorides and positive for NH4CdF3 and NH4MnCl3. Comparison with the known data for other halide and oxide perovskites allowed to conclude that the s ign of dT(0)/dP is correlated with the value of the Goldschmidt tolerance f actor of the perovskite, and its value is closely related to the temperatur e and mechanism of the transition.