标题： 非均相系统介电弛豫的界面极化压力依赖性及负活化体积 显示英文标题

标题： Pressure dependence of the interfacial polarization and negative activation volume for dielectric relaxation in heterogeneous systems

摘要： 负激活体积在固态物理学中很少被报道，并且仅限于原子尺度过程。 在多孔空间中包含水的异质系统（如多晶方解石和白云石）上进行的宽带介电谱学检测到了与界面极化相关的强烈介电松弛机制。 特征弛豫频率在静水压缩下增加，表明松弛的激活体积为负。 然而，到目前为止，对于激活体积负号的理论解释尚不存在。 在介观异质两相固-液系统有效介质近似的框架内，我们研究了极化和电荷传输压力依赖性的协同作用如何决定界面极化的压力依赖性。 预测有效激活体积的值。 我们的理论方法成功地预测了含水多晶材料中激活体积的负号和大小。 显示英文摘要

摘要： Negative activation volumes for dielectric relaxation are rarely reported in solid state physics and are limited to atomic scale processes. Broadband Dielectric Spectroscopy on heterogeneous systems, such as polycrystalline calcite and magnesite, hosting water in their porous spce, detectedintense dielectric relaxation mechanisms related to the interfacial polarization. The characteristic relaxation frequency increased uponhydrostatic compression, indicating that the activation volumes for relaxation are negative. However, a theoretical interpretation for the negative sign of the activation volume is lacking up to date. Within the frame of effective medium approximation for mesoscopic heterogeneous two phase solid - fluid systems, we investigate how the synergyof the pressure depedencies of polarization and electric charge transport, respectively, dictate the pressure dependence of interfacial polarization . predicting the value of the effective activation volume. Our theoretical approach succeeds in predicting the negative sign and magnitude of the activation volume in water saturated polycrystalline materials.