Investigations of Phase Transitions in (NH4)3H(SO4)2 Crystal by Means of Mn2+ EPR Spectra |
| W. Bednarski and S. Waplak Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland |
| Received: June 11, 1996; revised version: September 9, 1996 |
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| EPR of Mn2+ impurity ion in the (NH4)3H(SO4)2 crystal is studied in the temperature range 80-420 K. It is shown that Mn2+ substitutes NH4+(I) ion and is coordinated in deformed oxygen octahedron in which takes 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. |
| DOI: 10.12693/APhysPolA.90.1185 PACS numbers: 61.50.-f, 76.30.-v |