Abstract Ba1-xCaxTiO3 (Ca added BaTiO3; x = 0–0.3) ceramics is used as a target catalyst to probe the influence of ferro-electricity on the de-colorization of a typical dye molecule Methyl orange under visible light irradiation. The results indicated that there is a two fold increase in the de-colorization rate using Ba0.7Ca0.3TiO3 in around 180 min. This is ascribed to the ferro-electricity of the tetragonal phase. To probe the ferro-electricity in the catalyst, the P-E hysteresis loops show high polarization of 17.50 µC/cm2 in x = 0.3 compared to 10 µC/cm2 for x = 0 at 303 K. The high value of polarization in Ca added BaTiO3 enhances ferro-electricity and ensures a tightly bound layer of dye molecule and also acts to separate the photo-excited carriers due to the internal space charge layer. Both these features act to enhance the catalytic performance. Further, we studied the temperature dependence of dielectric study and it was found that dielectric constant increased and undergoes a maximum corresponding to a phase transition (330 K for x = 0.3) and thereafter decreased. The Ca substitution diffused the phase transition of BaTiO3 and resulted in shift of transition temperature towards room temperature with increase in content of Ca which is useful for many dielectric applications.

中文翻译：

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Ba1-xCaxTiO3陶瓷的结构、铁电和光催化性能

摘要 Ba1-xCaxTiO3（Ca加BaTiO3；x=0-0.3）陶瓷作为靶催化剂，研究了铁电对典型染料分子甲基橙在可见光照射下脱色的影响。结果表明，在大约 180 分钟内，使用 Ba0.7Ca0.3TiO3 的脱色率增加了两倍。这归因于四方相的铁电性。为了探测催化剂中的铁电性，PE 磁滞回线在 x = 0.3 时显示出 17.50 µC/cm2 的高极化，而在 303 K 下 x = 0 时为 10 µC/cm2。Ca 添加的 BaTiO3 中的高极化值增强了铁电性并确保染料分子的紧密结合层，并且由于内部空间电荷层还起到分离光激发载流子的作用。这两个特征都起​​到提高催化性能的作用。此外，我们研究了介电研究的温度依赖性，发现介电常数增加并经历与相变相对应的最大值（x = 0.3 时为 330 K），然后降低。Ca 取代扩散了 BaTiO3 的相变并导致转变温度随着 Ca 含量的增加而向室温移动，这对于许多介电应用是有用的。