Raman spectra of (K, Na)(Nb,Ta)O3 single crystal

JOURNAL OF ALLOYS AND COMPOUNDS

卷:704

Article

Sang, Shijing^1,2  Yuan, Zhongyuan^1,2  Zheng, Limei¹  Sun, Enwei¹  Qi, Xudong¹  Zhang, Rui¹  Jiang, Xiaoning²  Li, Shiyang³  Du, Juan⁴ 

[1] Harbin Inst Technol, Condensed Matter Sci & Technol Inst, Harbin 150080, Peoples R China

[2] North Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA

[3] Shanghai Jiao Tong Univ, Dept Instrument Sci & Engn, Shanghai 200240, Peoples R China

[4] Liaocheng Univ, Sch Mat Sci & Engn, Liaocheng 252059, Peoples R China

关键词: Sodium potassium tantalate niobate;    Lead free;    Single crystal;    Raman scattering;    Temperature dependence;    Polarization selection rules;   

DOI  :  10.1016/j.jallcom.2016.12.166

来源: Elsevier

【 摘 要 】

The Raman scattering spectra for lead-free piezoelectric single crystal (K,Na)(Nb,Ta)O-3 (KNNT) were intensively investigated to explore its crystallographic structure. For the [011](c) oriented sample, 12 Raman peaks were identified from the room temperature Raman spectrum, The v(3), v(4) and v(6) modes which should be Raman silent in normal perovskites were observed due to the low symmetry (Pm) of KNNT single crystal. The temperature dependent Raman spectra indicated that the orthorhombic tetragonal phase transition happened at about 68 C-circle, and the Curie temperature (T-c) is about 225 C-circle. The merging of 2 v(5) modes at Tc was ascribed to the vanishing of polarization. The backscattering polarized Raman spectra of KNNT single crystals with different orientations were analyzed. The Raman modes were identified using polarized selection rules based on group theory. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free