Study of phase evolution and dielectric properties of Sr2Mn0.7Sn0.3O4
| Autor: | Nirala Gurudeo, Upadhyay Shail |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Processing and Application of Ceramics, Vol 17, Iss 2, Pp 181-188 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1820-6131 2406-1034 |
| DOI: | 10.2298/PAC2302181N |
| Popis: | 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 Å and c = 12.1230Å lattice parameters and I4/mmm space group symmetry. Permittivity (ε), impedance (Z*), dissipation factor (tan δ) and AC conductivity (σAC) 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. |
| Databáze: | Directory of Open Access Journals |
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