This paper deals with an in-depth analysis on the role of the microstructure phase of titanium dioxide (TiO₂) precursor in sodium bismuth titanate (Na_0.5Bi_0.5TiO₃, hereafter represented as NBT) ceramics prepared through the hydrothermal method. The comparison of the grain size, microstructure, crystal structure, and electrical properties of the NBT ceramics is carried out using anatase and rutile TiO₂. NBT ceramics with anatase TiO₂ (denoted by NBT_A) displayed superior dielectric and ferro/piezoelectric properties along with the additional functionality in terms of photocatalysis. Systematic studies of functional properties such as piezoelectric, ferroelectric, and dielectric stressed the far-reaching influence of effects on grain size. The mechanisms and functional properties of grain quantitative effects are also discussed. Grain boundaries volume fraction increment has decreased the dielectric peak but increased the diffusiveness in the case of the NBT with rutile TiO₂ precursor (denoted as NBT_R). Similarly, elastic stiffness increment restricts the movement of the domain wall and led to a decrement in remnant polarization along with an increase in the values of the corresponding piezoelectric coefficient in fine-grain NBT_R samples.

本文深入分析了二氧化钛（TiO ₂）前驱体微结构相在水热法制备的钛酸铋钠（Na _0.5 Bi _0.5 TiO ₃，以下简称NBT）陶瓷中的作用。使用锐钛矿和金红石型TiO ₂对NBT陶瓷的晶粒尺寸、微观结构、晶体结构和电性能进行了比较。带有锐钛矿 TiO _{2 的}NBT 陶瓷（用 NBT _A表示) 显示出优异的介电和铁/压电性能以及光催化方面的附加功能。对压电、铁电和介电等功能特性的系统研究强调了对晶粒尺寸影响的深远影响。还讨论了谷物定量效应的机制和功能特性。在具有金红石 TiO ₂前体的 NBT（表示为 NB _R）的情况下，晶界体积分数增量降低了介电峰值但增加了扩散性。类似地，弹性刚度的增加限制了畴壁的运动，导致剩余极化的减少以及细晶粒 NBT 中相应压电系数值的增加_R样本。