結晶均質化法とＳＥＭ・ＥＢＳＤ結晶方位解析に基づいた圧電セラミックスの強誘電特性評価

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タイトル別名
  • Evaluation of Ferroelectric Properties of Piezoelectric Ceramics Based on Crystallographic Homogenization Method and Crystal Orientation Analysis by SEM EBSD Technique
  • ケッショウ キンシツカホウ ト SEM EBSD ケッショウ ホウイ カイセキ ニ モトヅイタ アツデン セラミックス ノ キョウ ユウデン トクセイ ヒョウカ

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抄録

Macroscopic ferroelectric properties of piezoelectric polycrystals are strongly affected by microscopic non-homogeneous crystal structure. In our previous study, a multi-scale finite element procedure based on crystallographic homogenization method has been developed to predict macroscopic properties by considering microscopic crystal morphology. In this study, a crystal orientation distribution of polycrystalline barium titanate has been measured by SEM·EBSD technique, and it has been introduced to the microscopic finite element model, which satisfies the periodicity. As the prediction of macroscopic properties depends on the sampling conditions of the measured crystal orientations, the effects of number of sampling points and sampling area have been investigated.Additionally, the influence of dispersion of crystal morphology on macroscopic ferroelectric properties has been discussed.

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