Publication Date:
2015-06-14
Description:
The correlation between the crystallization temperature and ferroelectric properties is studied by the measurements of impedance spectroscopy, activation energy, dielectric breakdown strength and dielectric constant in Na 0.9 K 0.1 NbO 3 glass-ceramics, while different nucleating agents are added to optimize performance. It is found that the glass-ceramics crystallized at the temperatures of the second exothermic peak (about 900°C) have higher crystal degree, lager interface numbers and larger amount of bulk charges accumulated at the interfaces. However, the higher crystal degree of ferroelectric phase results in a lower value of resistivity and E a which represent better charge spreading behavior. The better charge spreading behavior and drastic increase in the accumulation of bulk charge also result in low breakdown strength. The results show that the glass-ceramics heated at the temperature of first exothermic peak (about 700°C) with a reasonable crystal degree obtain higher energy storage density which is 1.94 J/cm 3 .
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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