Diffuse phase transitions, electrical conduction, and low temperature dielectric properties of sol–gel derived ferroelectric barium titanate thin films
Diffuse phase transitions, electrical conduction, and low temperature dielectric properties of sol–gel derived ferroelectric barium titanate thin films
复制标题
DOI：
10.1063/1.1367318
复制
发表时间：
2001-07
影响因子：
3.2
通讯作者：
Reji Thomas;V. Varadan;S. Komarneni;D. Dube
中科院分区：
文献类型：
--
作者：
Reji Thomas;V. Varadan;S. Komarneni;D. Dube
采用溶胶-凝胶法在铂衬底上制备了钛酸钡铁电薄膜。加工温度为700 ° C。薄膜厚度为1.5 μ m，致密透明，具有铁电性。扫描电子显微镜和x射线衍射用于研究的表面形貌和晶体结构的薄膜。在金属-铁电-金属配置（MFM）中的膜用于电测量。介电常数和损耗角正切被认为是430和0.015，分别在10 kHz的环境条件下。e ′（T）曲线显示中心在120 ° C附近的宽峰，如在扩散相变的情况下。交流电导率在低频区与ω 0.9成正比，在高频区与ω 1.8成正比。直流电导率与温度的关系曲线显示，在125 ° C附近斜率发生变化，对应于相变。为了研究低温相变、介电参数对薄膜介电性能的影响。
Ferroelectric thin films of barium titanate were fabricated by sol–gel technique on platinum substrates. The processing temperature was 700 °C. The films obtained with a thickness of 1.5 μm were dense, transparent, and showed ferroelectricity. Scanning electron microscopy and x-ray diffraction were used for studying the surface morphology and crystallographic structure of the film. Films in the metal–ferroelectric–metal configuration (MFM) were used for the electrical measurements. Dielectric constant and loss tangent were found to be 430 and 0.015, respectively, at 10 kHz under ambient conditions. The e′(T) curve shows broad peak centered around 120 °C as in the case of diffuse phase transition. The ac conductivity is proportional to ω0.9 in the low frequency region and ω1.8 in the high frequency region. The dc conductivity versus temperature curve showed a change in the slope around 125 °C, corresponding to the phase transition. To study the low temperature phase transitions, dielectric parameters on th...