Electron Paramagnetic Resonance Study of Mn^<2+> in Tris-Sarcosine Calcium Bromide

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概要

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• Electron paramagnetic resonance of Mn^<2+> in a single crystal of trissarcosine calcium bromide (TSCBr), as a function of temperature and orientation, has been studied. These studies suggest the existence of two chemically equivalent but physically non equivalent Mn^<2+> site in a unit cell of TSCBr. Of the two space groups determined by neutron diffraction studies, Pnma and Pn2_1a, EPR studies are in conformity with the space group Pnma. The dielectric constant measurements in TSCBr do not show any anomaly in the temperature interval 300-100 K. Trissarcosine calcium chloride (TSCC, space group Pnma in the paraelectric phase) undergoes a ferroelectric phase transition at 127 K. Replacement of Cl by Br is expected to introduce changes in the N-H..X bond (X=Cl, Br) and hence, we believe, protons in the N-H..Cl bond may be playing an important role in the mechanism of ferroelectricity in TSCC.

• 社団法人日本物理学会の論文
• 1975-10-15

著者

• Gupta L.c.

  Tata Institute Of Fundamental Research

• Gupta L.

  Tata Institute Of Fundamental Research

• Navalgund Ranganath

  Tata Institute Of Fundamental Research

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