EPR Study of V4+ Ions in Tungsten Trioxide WO3

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書誌事項

タイトル別名
  • EPR Study of V<SUP>4+</SUP> Ions in Tungsten Trioxide WO<SUB>3</SUB>
  • EPR Study of V4 + Ions in Tungsten Trio
公開日
1985
DOI
  • 10.1143/jpsj.54.3584
公開者
一般社団法人 日本物理学会

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説明

The EPR spectra from V4+ ions in WO3 single crystal were studied in the temperature range from 300 K to 77 K by using a K-band spectrometer. At 77 K, the g values and hf parameters A of V4+ ions were strong c-axis anistropy, so that gX=1.928, gY=1.945, gZ=1.815, (Eulerian angles; θg=3.9°, φg=45.8°, ψg=−0.2°), and AX=−60.5 G, AY=−55.0 G, AZ=−190.4 G, (θA=4.4°, φA=43.6°, ψA=1.5°). The ground state of 3d1 electron of V4+ ion was determined to be |xy⟩ state by hf structure analysis. WO3 is determined to be a ferroelectric material with the spontaneous polarization along the c-axis connected to the condensed ferroelectric Γ15z phonon modes of W6+ ions in the monoclinic II phase at 77 K. At the relations of gav vs Aiso for V4+ and VO2+ ions in some host crystals, WO3 is shown to be a remarkable material.

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