ZnO 997

ZnO 997

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The ZnO varistor made of ZnO 997 has unique excellent properties such as large nonlinear coefficient, short response time, low residual voltage, small voltage temperature coefficient, and small leakage current. Therefore, the development of ZnO 997 in ZnO varistor The application plays a pivotal role.

*Room temperature stable ZnO 997 has a wurtzite crystal structure, in which oxygen ions are arranged in a hexagonal close-packed manner, zinc occupies half of the tetrahedral gap, and each ion is not strictly tetrahedral symmetry.

*The hardness of zinc oxide is about 4.5, which is a relatively soft material. The elastic constant of zinc oxide is smaller than that of group III-V semiconductor materials such as gallium nitride.

*ZnO 997 has good thermal stability and thermal conductivity, high boiling point and low thermal expansion coefficient, which is useful in the field of ceramic materials.

*The band gap of ZnO 997 energy band is 3.2-3.4eV, and ZnO 997 should be an insulator at room temperature. Due to the large structural gap, Zn can easily enter the gap and form Frenkel defects. Or because ZnO 997 decomposes at high temperature to produce excessive zinc and ionizes, it enters the gap and forms interstitial ions, causing shared movement of electrons in the structure to form an n-type semiconductor. Among various semiconductor materials with a tetrahedral structure, ZnO 997 has the highest piezoelectric tensor. This characteristic makes zinc oxide one of the important materials for mechanical and electrical coupling.

*Pure ZnO 997 is colorless and transparent. The high energy band gap brings ZnO 997 the advantages of high breakdown voltage, strong ability to maintain electric field, low electronic noise, and high endurable power. ZnO 997 mixed with a certain proportion of magnesium oxide or cadmium oxide will change the energy band gap between 3-4 eV.

The high stability of MST resistance grade ZNO 997 is a high-quality raw material for making ZnO varistor.