氧化物材料负热膨胀机理

Mechanisms of Negative Thermal Expansion in Complex Oxides

氧化物的负热膨胀性（ＮＴＥ）是由于在其开放式的骨架结构中，有二配位的桥氧键产生横向热运动，以及引起的多面体热摆动和耦合作用使非键合Ｍ－Ｍ１键距变短，导致单胞体积缩小；各向同性ＮＴＥ氧化物在复合材料及其相关技术领域具有更广泛的应用价值．

The negative thermal expansion (NTE) in some complex oxides has been attributed to transverse thermal motion of A-O-M linkage composed of two-coordinate Oxygen bridge bond, and the librations and tilts of essentially rigid polyhedral blocks in open framework structure. The isotopic NTE materials have been finding more substantial applications in composites and other relative technique fields.