The polycrystalline Sm_2/3Cu₃Ti₄O₁₂ (SCTO) ceramics have been prepared by solid‐state reaction. The crystallinity of the compound has been investigated by Rietveld refinement which has revealed a cubic structure with space group Im3. It is observed that at low frequencies, SCTO ceramic exhibits tremendously high values of dielectric permittivity ε′, larger than 32,000, at room temperature. Two distinct, thermally triggered, dielectric relaxations have been noted. This mechanism has been confirmed through impedance analysis of the ceramics. The complex impedance plane shows three semicircles, which confirm the existence of two dielectric relaxations in SCTO ceramics. In general, the electrical as well as dielectric behavior of SCTO ceramics are seen to be reasonably analogous to those of CaCu₃Ti₄O₁₂ (CCTO) ceramics. The emergence of the enormous dielectric constant in SCTO ceramic is accredited to the combined effect of polarization both at the sample‐electrode interface as well as at the insulating grain boundary interface. The SCTO ceramics are identical to the CCTO ceramics in their structure and composition and hence, as the above results indicate, the IBLC effect mechanism, originally put forward for CCTO ceramics, is furthermore plausible to account for the mammoth values of dielectric constant in SCTO ceramics.

中文翻译：

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Sm2 / 3Cu3Ti4O12陶瓷的超高介电常数，介电弛豫和可调性

通过固相反应制备了多晶Sm _2/3 Cu ₃ Ti ₄ O ₁₂（SCTO）陶瓷。该化合物的结晶度已通过Rietveld精制法进行了研究，该精制法揭示了具有空间群Im3的立方结构。可以看出，在低频下，SCTO陶瓷的介电常数ε极高”，大于32,000，在室温下。已经注意到两种不同的，热触发的介电弛豫。这种机理已经通过陶瓷的阻抗分析得到证实。复阻抗平面显示三个半圆，这确认了SCTO陶瓷中存在两个介电弛豫。通常，可以认为SCTO陶瓷的电学和介电性能与CaCu ₃ Ti ₄ O ₁₂相当相似。（CCTO）陶瓷。SCTO陶瓷中巨大介电常数的出现被证明是在样品-电极界面以及在绝缘晶界界面上极化作用的综合作用。SCTO陶瓷在结构和成分上与CCTO陶瓷相同，因此，如上述结果所示，最初为CCTO陶瓷提出的IBLC效应机制还可能解释了SCTO陶瓷的介电常数的巨大值。 。