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Epitaxial crystals of BaTiO 3 with the thicknesses of 67 Å, 230 Å, 600 Å and 1500 Å were grown on SrTiO 3 substrates by activated reactive evaporation. The tetragonality of the crystal decreases with increasing thickness and remains in the temperature range of 15 K to 670 K. The epitaxial effect is discussed in terms of a critical thickness, as well as of a surface layer of fine particles.
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Terauchi et al. (1992) studied this question.
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