Study of phase evolution and dielectric properties of Sr2Mn0.7Sn0.3O4

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
G. Nirala, S. Upadhyay
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引用次数: 0

Abstract

Ruddlesden-Popper oxide Sr2Mn0.7Sn0.3O4 was synthesized by solid state method by calcining at different temperatures between 1200 and 1500?C. The phase evolution during thermal treatments was investigated and it was shown that the powder calcined at 1500?C and ceramics sintered at 1500?C have single phase structure. Rietveld refinement of the XRD data confirmed tetragonal crystal structure having a = b = 3.9425 ? and c = 12.1230? lattice parameters and I4/mmm space group symmetry. Permittivity (?), impedance (Z*), dissipation factor (tan ?) and AC conductivity (?AC) of the samples were studied in the frequency range 1 kHz-2MHz and temperature range 60-600?C. An equivalent circuit comprising two parallel R-L elements and one constant phase element (CPE) model fitted the impedance data very well. Components of the equivalent circuit were correlated with compositional micro inhomogeneities in the sintered sample. Resonance-like feature observed in the dissipation factor at a particular temperature is attributed to the cancellation of capacitive and inductive reactants. Negative permittivity and loss of the sintered sample were compared with other ceramic oxides showing negative permittivity.
Sr2Mn0.7Sn0.3O4的相演化及介电性能研究
在1200 ~ 1500℃的不同温度下,采用固相法煅烧合成了ruddlesdin - popper氧化物Sr2Mn0.7Sn0.3O4。对热处理过程中的相演化进行了研究,结果表明,在1500?C和陶瓷烧结1500?C为单相结构。对XRD数据进行Rietveld细化,确定了a = b = 3.9425 ?c = 12.1230?晶格参数和I4/mmm空间群对称。在1 kHz-2MHz的频率范围和60-600℃的温度范围内,研究了样品的介电常数(?)、阻抗(Z*)、耗散因子(tan ?)和交流电导率(?AC)。由两个并联R-L元件和一个恒相元件(CPE)模型组成的等效电路很好地拟合了阻抗数据。等效电路的组成与烧结样品中成分的微观不均匀性有关。在特定温度下,在耗散因子中观察到的类共振特征归因于电容性和感性反应物的抵消。并与其他具有负介电常数的陶瓷氧化物进行了比较。
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来源期刊
Processing and Application of Ceramics
Processing and Application of Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
1.90
自引率
9.10%
发文量
14
审稿时长
10 weeks
期刊介绍: Information not localized
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