An ultra-broad working temperature dielectric material obtained with Praseodymium doped BaTiO3-(Bi0.5Na0.5)TiO3-Nb2O5 based ceramics

作者：Li Lingxia^*; Chen Junxiao; Guo Dong; Zhang Ning; Wang Mingjing; Liu Yaran

来源：Ceramics International, 2014, 40(8): 12539-12543.

DOI：10.1016/j.ceramint.2014.03.091

• Dielectrics
• Ceramics
• BaTiO3
• Stable permittivity

A material with stable permittivity (the capacitance is within +/- 15% of room temperature capacitance) at an ultra-broad temperature range of -55-300 degrees C has been achieved by doping appropriate amount (mol%) of Pr6O11 in multicomponent BaTiO3-(Bi0.5Na0.5)TiO3-Nb2O5 based ceramics. A remarkable high ceiling working temperature of 300 degrees C has been achieved by the doping of Pr6O11. It played a crucial role in the stability of high-temperature dielectric properties. While increasing the doping content of Pr6O11, the dielectric constant was decreased significantly at the temperature range of 200-300 degrees C and the maximum TCC value was reduced from 39% to only 4%. XRD results showed the substitution of Pr ion appeared in both Ba-site and Ti-site. The substitution decreased the spontaneous polarization of BaTiO3 and then weakened the ferroelectricity of BaTiO3. As a result, the temperature stability of samples was improved obviously. Besides, Pr6O11 addition promoted the formation of sheet grains, which were consisting of BaTi4O9. The best dielectric and electrical properties (epsilon(r) = 1608, tan delta=1.54%, rho(v)=2.15 x 10(12) Omega cm) at room temperature appear in the sample with 0.6 mol% Pr6O11 addition.

• 出版日期2014-9
• 单位天津大学