EPR Study of Strong Axial Cr^<3+>-V^o Centers in WO_3
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概要
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The EPR spectra of Cr" ion accompanied with a nearest neighbour oxygenvacancy (Cr"-V. center) were o bserved over a temperature range from - 150 to200'C and showed 'stronm axial field lines'. The crvstalline fields have been ob..tained as follows; lDl=84GHz, lfl=2.6GHz at 25'C, and ?Dj=120GHz,EJ=23 GHz at - zoo'c. These fields are very large compared with those observedin many other crystals. The annular dependence of the EPR spectra has beeninterpreted by a rotation of oxygen octahedra about a quasi-cubic diagonal (11 1 )axis and the displacements of tungsten atoms. From the temperature dependenceof the EPR spectra the softening of the rotational condensed phonon modes ofthe.oxygen octahedra was observed., The relations between the EPR spectra and the structural phase transitions inW03 are discussed.
- 社団法人日本物理学会の論文
- 1981-03-15
著者
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Kawaminami Masaru
Department Of Physics College Of Liberal Arts Kagoshima University
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Hirose Toshikazu
Department Of Physics College Of Liberal Arts Kagoshima University
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Hirose Toshikazu
Department of Physics,College of Liberal Arts,Kagoshima University
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