碳污染对火花等离子体烧结钛酸钡陶瓷低温导电性能的影响
Impact of Carbon Contamination on the Low-Temperature Electric Conduction of the Spark-Plasma Sintered Barium Titanate Ceramics
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中文总结 AI 辅助
研究碳污染对火花等离子体烧结BaTiO3陶瓷低温导电性能的影响，发现其低频介电常数极高且依赖碳含量，导电符合莫特跳跃定律，结果可由相关理论解释。
中文摘要 AI 辅助
研究了经火花等离子体烧结制备、并额外掺杂不同含量碳污染的BaTiO3样品的介电与导电性能，测试温度范围为77至408 K（小非加热电场下），以及77至200 K（强电场下，最高达20 kV/cm）。额外掺碳样品的有效介电常数在低频下达到巨量值，393 K时可达10^6量级；低温范围内仍维持极高值，低频下为10^4-10^5，且强烈依赖碳含量。77至200 K范围内的导电行为符合跳跃导电，遵循莫特定律。还研究了77至200 K范围内导电性能与有效介电常数随电场强度的变化，结果可通过跳跃导电理论及极化过程与导电过程中不同组分的假设解释。
英文摘要
The dielectric and electric conduction properties of BaTiO3 samples fabricated by the spark plasma sintering with additional contamination by different content of carbon have been investigated in the temperature range from 77 through 408 K in small non-heating electric fields and in the range of 77 - 200K under strong electric fields up to 20 kV/cm. The effective dielectric permittivity of the samples with additional carbon achieves colossal values at low frequency, up to several units per 106 at 393 K. In the low temperature range, it remains very high magnitude, 10^4 -10^5 at low frequency and is strongly dependent on the carbon content. The electric conduction in the range of 77 - 200 K bears the hopping conduction and obeys the Mott law. We also studied electric conduction and effective dielectric permittivity vs electric field strength in the range of 77 - 200 K. The results are explained within the frames of hopping conduction theory and suggestion on different constituents in polarization processes and electric conduction.
