Electron paramagnetic resonance of Mn2+ in (NH4)2SO4 single crystal

Chowdari, B. V. R. ; Venkateswarlu, Putcha (1968) Electron paramagnetic resonance of Mn2+ in (NH4)2SO4 single crystal Proceedings of the Indian Academy of Sciences, Section A, 67 (3). pp. 130-137. ISSN 0370-0089

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Official URL: http://www.ias.ac.in/j_archive/proca/67/3/130-137/...

Related URL: http://dx.doi.org/10.1007/BF03049412


Electron paramagnetic resonance investigation of Mn2+ in (NH4)2SO4 single crystal is discussed both in paraelectric and ferroelectric phases of the crystal. Mn2+ is found to substitute one of the two possible types (α andβ ) of NH4+ ions and get associated with the second type of NH4+ vacancy, the vacancy being the second distant neighbour in thebc-plane. As The line joining Mn2+ substituted NH4+ site and NH4+ vacancy lies at an angle of 18° from the crystallographicb-axis in the bc-plane. As the temperature is lowered to −56° C the crystal becomes ferroelectric and the spectrum in the paraelectric phase splits into two from which it appears that two sets of Mn2+ sites which are magnetically equivalent in the paraelectric phase become inequivalent in the ferroelectric phase. The spin Hamiltonian analysis is presented for the spectrum in the paraelectric phase.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:68631
Deposited On:02 Nov 2011 10:46
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