Raman Studies on Structure Transitions of Layered Ferroelectrics Ba2+xBi4-xTi5-xNbxO18

Chin. Phys. Lett.

1998, Vol. 15

Issue (6): 438-440 DOI:

Original Articles

Raman Studies on Structure Transitions of Layered Ferroelectrics Ba_2+xBi_4-xTi_5-xNb_xO₁₈

HAN Jie;ZOU Guang-tian;CUI Qi-liang;YANG Hai-bin;CUI Tian

National Laboratory of Superhard Materials, Jilin University, Changchun 130023

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HAN Jie, ZOU Guang-tian, CUI Qi-liang et al 1998 Chin. Phys. Lett. 15 438-440

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Abstract Raman spectra of layered ferroelectrics Ba_2+xBi_4-xTi_5-xNb_xO₁₈ (0 ≤ x ≤ 2) at room temperature in the range 20-1000cm^-1 were investigated. Vibration modes were assigned with the use of internal mode approach. Two doping-induced structure phase transitions were observed at about x = 0.50 and x = 1.25, respectively. Raman spectra variations were analyzed according to the selection rules of BO₆ octahedra in various symmetry. Polycrystalline samples were synthesized by solid state reaction method.

Keywords: 61.50.Ks 64.70.Kb 77.80.Bh

Published: 01 June 1998

PACS:	61.50.Ks	(Crystallographic aspects of phase transformations; pressure effects)
	64.70.Kb
	77.80.Bh

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1998/V15/I6/0438

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	HAN Jie
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