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Compression of CdCu_3Ti_4O_(12) perovskite to 55 GPa

机译:将CdCu_3Ti_4O_(12)钙钛矿压缩至55 GPa

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Synchrotron x-ray diffraction measurements of CdCu_3Ti_4O_(12) (CDCTO) were performed up to 55.5 GPa. There is no structural phase transformation in this pressure range. The irregular curvature shifts of the P-V curve are attributed to the grain surface effect. Analysis indicates that the grain surface of CDCTO is stiffer than the grain interior at higher pressures. We point out that the atoms on grain surfaces must be either densely packed or have a strong correlation with the gain interior in order to have a high dielectric constant, as in CaCu_3Ti_4O_(12). The derived bulk modulus K_(OT)of CDCTO is approximately 235 ± 7 GPa with K' = 5.1 ± 0.4.
机译:CdCu_3Ti_4O_(12)(CDCTO)的同步加速X射线衍射测量最高达到55.5 GPa。在该压力范围内没有结构相变。 P-V曲线的不规则曲率移动归因于晶粒表面效应。分析表明,在较高压力下,CDCTO的晶粒表面比晶粒内部更硬。我们指出,与CaCu_3Ti_4O_(12)一样,为了具有高介电常数,晶粒表面上的原子必须紧密堆积或与增益内部具有很强的相关性。 CDCTO的导出体积模量K_(OT)约为235±7 GPa,K'= 5.1±0.4。

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