バリウム鉄ホウ酸塩ガラスからのBaFe_<12>O_<19>の結晶化に関する電子スピン共鳴及びメスバウアー分光法による研究

概要

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The crystallization process of BaFe_<12>O_<19> from barium iron borate glass of 35.7BaO・34.3Fe_2O_3・30.0B_2O_3 composition has been investigated by using electron spin resonance (ESR) and Mossbauer spectroscopies. The linewidth of ESR spectra of the specimens heat-treated at 500℃ to 560℃ is narrow because of superparamagnetism of small BaFe_<12>O_<19> particles precipitated. The ESR spectrum of specimen heat-treated at 580℃ manifested an asymmetrical line. Also, in the Mossbauer spectrum of this specimen, the hyperfine structure was observed in addition to paramagnetic quadrupole doublet. These facts indicate that both ferrimagnetic and superparamagnetic BaFe_<12>O_<19> particles are present in this specimen. From the broad linewidth of ESR spectra and intense peaks due to internal fields in the Mossbauer spectra for the specimens heat-treated above 600℃, it is shown that most of BaFe_<12>O_<19> particles in these specimens are ferrimagnetic at room temperature as a result of crystal growth.
社団法人日本セラミックス協会の論文
1993-03-01