Journal
ENERGY TECHNOLOGY
Volume 5, Issue 8, Pages 1423-1428Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201600713
Keywords
capacitors; energy storage; ferroelectrics; glass ceramics; metal oxides
Categories
Funding
- National Natural Science Foundation of China [51422704]
- State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University [EIPE14113]
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The addition of the glass BaO-SrO-TiO2-Al2O3-SiO2-BaF2 was employed to improve the microstructures and energy storage properties of Ba(Zr0.2Ti0.8)O-3-0.15(Ba0.7Ca0.3)TiO3 ceramics, which exhibited a large dielectric constant of 3458 at 25 degrees C under 1kHz, slim hysteresis loop with the maximum polarization of 12.53Ccm(-2), and a remnant polarization of 4.05Ccm(-2). Characterization of the microstructure indicated that the average grain size was reduced significantly with increasing glass concentration. Macroscopically the glass ceramics exhibited diffusion phase transition with reduced peak dielectric constant, but a broad peak with a relatively large dielectric constant of approximately 1000 near room temperature. Meanwhile the electrical breakdown strength (BDS) of the glass modified ceramics was nearly quadruple that of the pure ceramic. The energy storage performance of the glass-modified ceramics (419.4kJm(-3) calculated from the product of dielectric constant and square of BDS and 192.8kJm(-3) from the integration of the hysteresis loop under an electric field of 9.6kVmm(-1)) showed significant superiority to that of the pure ceramic material.
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