Cr_(2(1-x))(HfMg)_(x)Mo_(3)O_(12)固溶体相变及热膨胀性能的研究  

Phase Transition and Negative Thermal Expansion of Cr_(2(1-x))(HfMg)_(x)Mo_(3)O_(12)

作　　者：王献立 付林杰 陈冬霞 许坤[1] 于占军 WANG Xianli;FU Linjie;CHEN Dongxia;XU Kun;YU Zhanjun(Physics Experiment Center,Zhengzhou University of Aeronautics,Zhengzhou 450046,China)

机构地区：[1]郑州航空工业管理学院物理实验中心,河南郑州450046

出　　处：《郑州航空工业管理学院学报》2022年第5期98-101,共4页Journal of Zhengzhou University of Aeronautics

基　　金：国家自然科学基金(11847099);河南省科技攻关项目(222102230108、212102210271);河南高校重点科研项目基础研究专项计划(22ZX012);河南省高校科技创新团队支持计划(22IRTSTHN004);河南省高校重点科研项目(21B140010)。

摘　　要：利用固相烧结法制备出Cr_(2(1-x))(HfMg)_(x)Mo_(3)O_(12)系列材料,能有效降低Cr_(2)Mo_(3)O_(12)的相变温度,并改善其热膨胀性能。研究了(HfMg)^(6+)掺杂量对材料相变和热膨胀的影响。结果表明,该系列材料单斜相到正交相的相变温度明显降低,随着(HfMg)^(6+)参杂量的增加,转变为正交相结构后材料的热膨胀系数逐渐减小接近零膨胀。当x≥0.7时,该材料在室温下展示为宽温度范围的近零膨胀性,意味着该材料在诸多领域都有潜在的应用前景。Solid solutions of Cr_(2(1-x))(HfMg)_(x)Mo_(3)O_(12) are synthesized by solid state reaction which can effectively reduce the phase-transition temperature ofCr_(2)Mo_(3)O_(12) and improve its thermal expansion property.The effects of(HfMg)^(6+)incorporation on the phase transition and thermal expansion are investigated.It is shown that the monoclinic-to-orthorhombic phase transition temperature decreases significantly and the coefficient of thermal expansion(CTE)of the orthorhombic becomes less negative and close to zero with increasing the content of(HfMg)^(6+).A near zero thermal expansion covering the case at room temperature(RT)is achieved for the solid solutions with x≥0.7,implying potential applications of this material in many fields.

关 键 词：相变 热膨胀 拉曼光谱 固相烧结法 

分 类 号：TB39[一般工业技术—材料科学与工程]