強誘電体セラミックスの電気的機械的エージングと疲労

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概要

• 論文の詳細を見る

• The aging and fatigue phenomena is one of the important points to understand the electrical and mechanical properties of ferroelectric ceramics such as BaTiO_3,Pb(Zr, Ti)O_3 (hereinafter PZT) and (Pb, La)(Zr, Ti)O_3 (hereinafter PLZT). In this paper, first, the internal bias field generated in the ferroelectric domains during the aging process both after thermal depolarization and after DC field applications are described. Also, the shape changes of D-E hysteresis loop by the internal bias field and the related "Space-Charge Model" proposed by Okazaki are reviewed. Second, the electrical fatigue by high AC field applications for virgin sample, for poled sample, for aged samples both from virgin state and from poled state were measured with the related D-E loop shape changes for various PZT compositions with different tetragonalities, and the origins of the internal bias field were discussed. Third, a microindentation technology was applied to some transparent pore-free PLZT compositions with cubic, tetragonal and rhombohedral crystal structures and the apparent fracture toughnesses were calculated. These results have revealed that the mechanical internal stresses induced by the phase transition at the Curie point during the cooling process after sintering have different values and they are almost proportional to the crystal tetragonalities. Fourth, it was clarified that the DC field application induced an anisotropic internal stress in the direction perpendicular to the poling field. The aging effects of the isotropic internal stress induced by the phase transition montioned above and the adittional anisotropic internal stress induced by DC field field were measured with discussion on the relations between electrical and mechanical aging. One of the most important conclusins is that sample histories such as heat treatment conditions, aging time after thermal depolarization, DC and/or AC field applications and others systematically affect to the electrical and mechanical properties.

• 湘南工科大学の論文
• 1991-03-31

著者

• 岡崎 清

  湘南工科大学

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