Effect of SrBi₈Ti₇O₂₇ hetero-template on texture development in Bi₄Ti₃O₁₂

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  • Effect of SrBi<sub>8</sub>Ti<sub>7</sub>O<sub>27</sub> hetero-template on texture development in Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub>

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The effect of hetero-template grains on texture development in Bi4Ti3O12 (BiT) was examined. The hetero-template was SrBi8Ti7O27 (S0.5BT) grains with a large platelike shape. Texture developed in pure BiT made by solid-state reaction without template grains. The origin of texture development was attributed to the growth of small platelike grains with an aspect ratio of approximately 3 (homo-template) present in the BiT powder. The hetero-template grains added to the BiT powder promoted texture development, and the degree of the promotion was dependent on the amount of hetero-template. When the concentration of hetero-template was 1 vol %, the hetero-template and homo-template acted as the origin of texture development. When the concentration was increased to 5 vol %, the orientation of grains was almost only caused by the hetero-template. When the concentration was further increased to 10 vol %, texture did not develop. SrTiO3 in the hetero-template dissolved in the BiT matrix grains, thus reducing the grain growth rate. These results indicate that grain growth is essential for texture development in BiT.

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