Abstract Two modified phosphate minerals were heat-treated and characterized. A single apatite phase is detected after 1000°C heat treatment, although the natural phosphates were initially composed of sodium and carbonate co-substituted fluorapatites with some impurities. Temperature and frequency dependent electric properties are studied in the 10 Hz to 35 MHz frequency domain at different temperatures using complex impedance analysis. Influence of the composition, temperature, and frequency on the conduction properties of the selected phosphate ceramics is discussed. The best conduction is obtained with a modified material coming from the Khouribga deposit. The conduction mechanism, which depends on the nature of the mobile ion and the vacancy sites, has a one-dimensional character for fluoride and a tri-dimensional one for sodium in the apatite structure, which offers the possibility to modulate a mixed ionic conductivity.

中文翻译：

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热处理磷酸盐矿物的电和介电行为

摘要 对两种改性磷酸盐矿物进行了热处理和表征。尽管天然磷酸盐最初由钠和碳酸盐共取代的氟磷灰石和一些杂质组成，但在 1000°C 热处理后检测到单一的磷灰石相。使用复阻抗分析在 10 Hz 至 35 MHz 频域中在不同温度下研究温度和频率相关的电气特性。讨论了成分、温度和频率对所选磷酸盐陶瓷导电性能的影响。最好的传导是使用来自 Khouribga 矿床的改性材料获得的。传导机制，取决于移动离子的性质和空位，