Usually not conductive ceramics, is a good insulator. Such as oxide ceramics, the outer electrons of the atoms are often affected by the nuclear attraction, trapped in their surrounding atoms, can not move freely. So the ceramic oxide is usually non-conductive insulator. However, some ceramic oxide when heated in the outer electron atom can be obtained enough energy to overcome the nucleus of its appeal, and become a free electron movement, the ceramic becomes conductive ceramics.
With a proton conducting ceramic has been found in many species, but as a practical material, with stable physical and chemical properties of temperature and humidity in a wide range, high conductivity, suitable for high temperature and low cost. The practical value is mainly SrCeO3 type high temperature proton conducting ceramics.
Has now developed a high temperature electronic conductive ceramic materials can be applied to a variety of high temperature: maximum temperature of silicon carbide ceramics is 1450. The maximum use temperature of two molybdenum silicide ceramics is 1650 DEG C, the highest temperature of zirconia ceramics is 2000 DEG C, the highest use temperature of thoria ceramics as high as 2500 degrees Celsius.In addition, there are ionic conductive ceramics and semiconductor ceramics, each has its own features, with different functions
