INVESTIGATIONS OF PHASE-TRANSITIONS IN (NH4)(3)H(SO4)(2) CRYSTAL BY MEANS OF MN2-SPECTRA( EPR)

Authors
BEDNARSKI W WAPLAK S
Citation
W. Bednarski et S. Waplak, INVESTIGATIONS OF PHASE-TRANSITIONS IN (NH4)(3)H(SO4)(2) CRYSTAL BY MEANS OF MN2-SPECTRA( EPR), Acta Physica Polonica. A, 90(6), 1996, pp. 1185-1192
Citations number
18
Categorie Soggetti
Physics
Journal title
Acta Physica Polonica. A → ACNP
ISSN journal
05874246
Volume
90
Issue
6
Year of publication
1996
Pages
1185 - 1192
Database
ISI
SICI code
0587-4246(1996)90:6<1185:IOPI(C>2.0.ZU;2-J
Abstract
EPR of Mn2+ impurity ion in the (NH4)(3)H(SO4)(2) crystal is studied i n the temperature range 80-420 K. It is shown that Mn2+ substitutes NH 4+(I) ion and is coordinated in deformed oxygen octahedron in which ta kes two ''off-center'' positions. Its spin-Hamiltonian parameters and direction cosines of crystal field are determined. The successive EPR line splitting for three phase transitions is discussed.