| Autor: |
Sapkota, Piyush, Fujii, Ichiro, Kim, Sangwook, Ueno, Shintaro, Kuroiwa, Yoshihiro, Wada, Satoshi |
| Zdroj: |
Japanese Journal of Applied Physics; November 2022, Vol. 61 Issue: Supplement 14 pSN1023-SN1023, 1p |
| Abstrakt: |
BaTi(1–2x)MnxNbxO3ceramics with 0 = x= 0.10 were fabricated and the crystal structure, microstructure, dielectric, and ferroelectric properties were investigated. The samples with x= 0.06 showed a pseudo-cubic symmetry in a wide temperature range from -150 °C to 200 °C but exhibited domain structures and a non-linear polarization–electric field response. The dielectric constant for these samples exhibited a comparatively flat response with temperature. The DC-bias dependence of the dielectric constant improved drastically from the samples with x= 0.06. A qualitative model of chemical grain size (CGS), defined by the distance between the co-dopant ions, was proposed which expressed the phonon propagation length in a wide temperature range and thus induced superparaelectricity in the ceramics. A critical CGS = 810 pm was determined geometrically for the sample with x= 0.06 such that samples with x= 0.06 were superparaelectric in nature. |
| Databáze: |
Supplemental Index |
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