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1995•Journal of Raman SpectroscopyRequires access

Raman study of the phase transition in LiTa0.9Nb0.1O3 single crystal

Yuncheng Ge, Chaozhong Zhao

Open publisher page 5 citations

Abstract

Abstract The Raman spectra of LiTa0.9Nb0.1O3 single crystal were studied as a function of temperature between 300 and 1000 K. When heated above 900 K, the crystals transform from the ferroelectric phase to the paraelectric phase, and the Raman data suggest that the phase transition is second order. The softening of an A1 mode was observed, but the ‘soft mode’ hardened at 120 cm−1. The mechanism of the phase transition is likely to be of the order‐disorder type.

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What this paper is about

Abstract The Raman spectra of LiTa0.9Nb0.1O3 single crystal were studied as a function of temperature between 300 and 1000 K. When heated above 900 K, the crystals transform from the ferroelectric phase to the paraelectric phase, and the Raman data suggest that the phase transition is second order. The softening of an A1 mode was observed, but the ‘soft mode’ hardened at 120 cm−1. The mechanism of the phase transition is likely to be of the order‐disorder type.

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Available abstract

Abstract The Raman spectra of LiTa0.9Nb0.1O3 single crystal were studied as a function of temperature between 300 and 1000 K. When heated above 900 K, the crystals transform from the ferroelectric phase to the paraelectric phase, and the Raman data suggest that the phase transition is second order. The softening of an A1 mode was observed, but the ‘soft mode’ hardened at 120 cm−1. The mechanism of the phase transition is likely to be of the order‐disorder type.

Key concepts: Raman spectroscopy, Ferroelectricity, Phase transition, Soft modes, Softening, Materials science, Phase (matter), Crystal (programming language)

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