本文以主晶相为钛酸锶钡的微晶玻璃电介质为研究对象，使用粉末烧结法制备不同镧、铈含量和不同烧结温度的微晶玻璃样品，采用宏观与微观测试相结合的方法，探讨了掺杂、烧结温度等因素对钛酸锶钡微晶玻璃的相转变、介电性能、储能特性及其相关的微观缺陷机理、高温弛豫特性的影响，以期得到具有优异储能特性的微晶玻璃电介质材料。研究表明，样品中均含有主晶相(Ba,Sr)TiO3和次晶相钡长石BaAl2Si2O8。在镧掺杂的钛酸锶钡微晶玻璃中，探究了La2O3含量对微晶玻璃介电性能和微观弛豫机制的影响。La2O3含量的增加使微晶玻璃样品中氧空位的浓度降低，且合适的La2O3含量可以使介电常数达到最大值。阻抗谱结果显示两个电响应，分别对应高频和低频。高频响应对应材料内部的晶体相，低频响则应归因于晶体-玻璃界面。每个响应分别在低温和高温下具有不同的弛豫机制。另外，随着La2O3含量的增加，阻抗的温度敏感性和电导率值均降低。在铈掺杂的钛酸锶钡微晶玻璃中，研究了Ce含量对钛酸锶钡微晶玻璃介电性能和微观缺陷机理的影响。随着Ce含量增加，Ce在晶格中的占位从Ce4+取代Ti4+位的形式逐渐转变为Ce3+进入Ba2+/Sr2+位的形式，并确定了相关补偿机制。当Ce含量为2 mol%时，介电常数与实测储能密度均达到最大值。此时阻抗谱显示出最小的阻抗值和最大的高温电导率。而当Ce含量进一步增加至3 mol%时，诸性能呈现相反趋势。这是由于此时材料内出现更多的阳离子空位，从而限制了氧空位的扩散速度。紫外-可见漫反射光谱表明，玻璃中添加CeO2可增加其网络结构的连通性。在微晶玻璃中，Ce含量增加（0到2 mol%）使禁带宽度变窄，电子跃迁所需能量降低，价带电子易跃迁至导带，电导率增加；相反地，Ce含量从2 mol%增加到3 mol%时，禁带宽度变宽，电导率下降。拉曼光谱结果证实了Ce离子在(Ba,Sr)TiO3晶格中的取代，并发现Ce掺杂改变了该晶相的四方性。选取铈掺杂的钛酸锶钡微晶玻璃，进一步研究了烧结温度对钛酸锶钡微晶玻璃的物相组成、介电性能和储能特性的影响。结果表明，提高烧结温度有利于主晶相的析出，并使其晶格有序度升高，同时有利于CeO2的析出。合适的烧结温度有利于改善微晶玻璃的致密度、介电和储能性能。

This work focuses on barium strontium titanate (BST) glass-ceramics as dielectrics. The glass-ceramic samples modified with compositional changes or sintering conditions were prepared by a powder devitrification route. Based on the combination of macroscopic measurements and microscopic observations, the effects of doping and sintering temperature on phase evolution, dielectric properties, energy storage characteristics, microscopic defect mechanisms, and high temperature relaxation behavior have been investigated in order to produce favorable glass-ceramics with better energy storage performance. The results show that both major phase (Ba,Sr)TiO3 and minor phase BaAl2Si2O8 feldspar are observed. As for the lanthanum-doped BST glass-ceramics, the dielectric properties and impedance behavior have been investigated as a function of La2O3 content. Oxygen vacancy concentration decreases with the increase of La2O3 content. A maxiumum value of dielectric constant occurs at an appropriate La2O3 content. From impedance spectroscopy, there are two electrical responses occurring: a low frequency response, which is related to the crystal-glass interface, and a high frequency response corresponding to the crystal phase. Each response has different relaxation mechanism at low and high temperatures, respectively. Both the temperature sensitivity of impedance and the value of ac conductivity decrease with the increase of La2O3 content. In the case of cerium-doped BST glass-ceramics, the effects of CeO2 content on phase evolution, dielectric properties, energy storage properties and defect mechanisms have been investigated. Cerium mainly acts as an equivalent dopant in the B-site of ABO3 perovskite structure at a low content and then cerium substitution gradually occurs in the A-site with increasing cerium content. The relevant compensation mechanisms have been identified. When cerium content is increased to 2 mol%, the maximum values of dielectric constant and energy storage density are obtained. The impedance spectra reveal the lowest value of real part of impedance and the highest ac conductivity. With a further addition of cerium to 3 mol%, the opposite trend is observed. This result is related to the presence of more cation vacancies, which, in turn, limits the diffusion rate of oxygen vacancy. The results of ultraviolet-visible diffuse-reflectance spectra show that the CeO2 addition in the glass can improve the connectivity of network structure. In BST glass-ceramics, with the increase of cerium content (0 to 2 mol%), the value of band gap energy decreases and the electronic transition energy decreases, then electrons can transit from the valence band to the conduction band easily, thus the conductivity increases. In contrast, when cerium content increases from 2 mol% to 3 mol%, the value of band gap energy increases, so the conductivity decreases. The results of Raman spectra confirm that cerium ions diffuse into the (Ba,Sr)TiO3 lattice structure and modify the tetragonality of the barium strontium titanate phase.The influence of sintering temperature on the phase composition, dielectric properties and energy storage characteristics of the cerium-doped BST glass-ceramics was further studied. It is shown that increasing the sintering temperature promotes the crystallization of major phase (Ba,Sr)TiO3 and therefore the increase of the order degree. Moreover, it is also beneficial to the crystallization of CeO2 phase. The improved bulk densities, dielectric properties and energy storage characteristics of these BST glass-ceramics can be obtained at optimal sintering temperature.