Multilayer ceramic capacitors based on relaxor BaTiO3-Bi(Zn1/2Ti1/2)O-3 for temperature stable and high energy density capacitor applications

作者：Kumar Nitish^*; Ionin Aleksey; Ansell Troy; Kwon Seongtae; Hackenberger Wesley; Cann David

来源：Applied Physics Letters, 2015, 106(25): 252901.

DOI：10.1063/1.4922947

The need for miniaturization without compromising cost and performance continues to motivate research in advanced capacitor devices. In this report, multilayer ceramic capacitors based on relaxor BaTiO3-Bi(Zn1/2Ti1/2)O-3 (BT-BZT) were fabricated and characterized. In bulk ceramic embodiments, BT-BZT has been shown to exhibit relative permittivities greater than 1000, high resistivities (rho > 1 G Omega-cm at 300 degrees C), and negligible saturation up to fields as high as 150 kV/cm. Multilayer capacitor embodiments were fabricated and found to exhibit similar dielectric and resistivity properties. The energy density for the multilayer ceramics reached values of similar to 2.8 J/cm(3) at room temperature at an applied electric field of similar to 330 kV/cm. This represents a significant improvement compared to commercially available multilayer capacitors. The dielectric properties were also found to be stable over a wide range of temperatures with a temperature coefficient of approximately -2000 ppm/K measured from 50 to 350 degrees C, an important criteria for high temperature applications. Finally, the compatibility of inexpensive Ag-Pd electrodes with these ceramics was also demonstrated, which can have implications on minimizing the device cost.

• 出版日期2015-6-22