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在比较铁电体材料与弛豫铁电体材料的异同之处的基础上，采用一般陶瓷工艺制备的U型电阻-温度特性热敏电阻电阻材料钛酸钡锶和钛酸铅锶等固溶体是一种掺杂弛豫铁电体。根据能带理论，用Heywang模型较好地解释了钛酸钡锶等材料中出现的U型电阻-温度特性。
Based on the similarities and differences between ferroelectric materials and relaxation ferroelectrics, U-type resistance-temperature characteristics thermistor resistance materials, such as barium strontium titanate and lead-strontium titanate, prepared by the general ceramic process are A doped relaxation ferroelectrics. According to the band theory, the Heywang model is used to explain the U-type resistance-temperature characteristics of barium strontium titanate and other materials.