Anomalous dielectric properties of Ba1-xCaxTiO3 thin films near the solubility limit

作者：Jia Qunping; Shen Bo^*; Hao Xihong; Song Sannian; Zhai Jiwei

来源：Materials Letters, 2009, 63(3-4): 464-466.

DOI：10.1016/j.matlet.2008.11.026

• BCT
• Sol-gel process
• Solubility limit
• Dielectric property
• Thin films

Barium calcium titanium Ba1-xCaxTiO3 (BCTx) is an important ferroelectric and antifierroelectric material. The BCTx (x=0, 0.1, 0.21, 0.3) thin films were prepared on (100)-oriented LaNiO3/Si substrates by a sol-gel process. X-ray diffraction showed that all the BCTx thin films exhibited a single perovskite phase with (100)preferred orientation. The temperature dependent dielectric properties showed that the BCT0.21 film which is near the solubility limit of CaTiO3 (CT) in BaTiO3 (BT) had a large dielectric constant and the lowest temperature coefficient. Although the dielectric loss for BCT0.21 film is slightly higher than the others, the BCT0.21 thin film is still a promising candidate for the devices which demand high and stable memory capability in temperature changeable environment.

• 出版日期2009-2-15
• 单位同济大学