Abstract—

Bi_4–xNd_xTi₃O₁₂ (x = 0.4, 0.8, 1.2, 1.6) bismuth neodymium titanate solid solutions have been prepared by solid-state reactions, via firing of mixtures of their constituent oxides in air at temperatures from 1003 to 1323 K. The crystal structure of the synthesized phases has been determined by X-ray diffraction. The results demonstrate that increasing the neodymium concentration leads to a morphotropic phase transition from the orthorhombic structure (sp. gr. B2cb) of the parent phase Bi₄Ti₃O₁₂ (which persists at x = 0.4 and 0.8) to a tetragonal structure (sp. gr. P4₂/ncm) at x = 1.2 and 1.6. The heat capacity of the synthesized bismuth neodymium titanate samples has been determined by differential scanning calorimetry in the temperature range 320–1000 K. The C_p(T) curves of the Bi_{4 – x}Nd_xTi₃O₁₂ samples with x = 0.4 and 0.8 have been shown to have extrema due to their ferroelectric phase transition.

中文翻译：

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Bi4–xNdxTi3O12 (x = 0.4, 0.8, 1.2, 1.6) 固溶体的合成、结构和热容量

摘要-

Bi _{4 –x} Nd _x Ti ₃ O ₁₂ ( x = 0.4, 0.8, 1.2, 1.6) 钛酸铋钕固溶体已通过固态反应制备，通过在空气中在 1003 至 1003 1323 K。合成相的晶体结构已通过 X 射线衍射确定。结果表明，增加钕浓度会导致从母相 Bi ₄ Ti ₃ O ₁₂的正交结构（sp. gr. B 2 cb）（在x= 0.4 和 0.8) 到x = 1.2 和 1.6处的四方结构 (sp. gr. P 4 ₂ / ncm ) 。在 320–1000 K 的温度范围内，通过差示扫描量热法测定了合成的钛酸铋钕样品的热容量。Bi _{4 – x} Nd _x Ti ₃ O ₁₂样品的C _p ( T ) 曲线，x = 0.4由于它们的铁电相变，0.8 已被证明具有极值。