Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO(3) Single Crystals as Revealed by Brillouin Light Scattering

doi:10.3390/ma11061000

	Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO(3) Single Crystals as Revealed by Brillouin Light Scattering
	Lee, Byoung Wan ; Oh, Soo Han ; Ko, Jae-Hyeon ; Li, Xiaobing 1; Luo, Haosu 1
刊名	MATERIALS
	2018
卷号	11 期号:6
关键词	NBT-BT lead-free relaxor polar nanoregion Brillouin scattering
ISSN号	1996-1944
DOI	10.3390/ma11061000
英文摘要	The elastic properties of unpoled and prepoled (Na1/2Bi1/2)TiO3-xBaTiO(3) (NBT-xBT) single crystals near the morphotropic phase boundary were investigated as a function of temperature using Brillouin light scattering. The acoustic mode frequency and the related acoustic damping of unpoled NBT-xBT showed very broad minimum and maximum, respectively, consistent with typical relaxor behaviors. The frequency softening of the longitudinal acoustic mode together with the increase in acoustic damping was largest along the <100> direction, indicating that polarization fluctuations were most substantial along this crystallographic direction. The difference in acoustic behaviors between the unpoled NBT-xBTs with x = 0.05 and 0.08 were negligible, which means that the NBT-xBT system exhibits typical relaxor properties over a certain composition range of at least 5 similar to 8%. The obtained relaxation time of polar nanoregions in the paraelectric phase showed a gradual slowing-down character without any critical divergent behavior. The prepoling of NBT-xBT along the <100> direction induced drastic changes in both mode frequency and damping at similar to 110 degrees C when the poling field was larger than 1.4 kV/mm, corresponding to the depoling process from macroscopic/mesoscopic ferroelectric order to ergodic relaxor state upon heating. Phase coexistence of ferroelectric and relaxor states was observed at the intermediate poling field of 1.4 kV/mm.
学科主题	Materials Science, Multidisciplinary
出版者	MDPI
WOS记录号	WOS:000436500300133
资助机构	This research was supported by the Hallym University Research Fund, 2017 (HRF-201711-010). ; This research was supported by the Hallym University Research Fund, 2017 (HRF-201711-010).
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/24878]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Hallym Univ, Dept Phys, Chunchon 24252, Gangwon Do, South Korea 2.Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201800, Peoples R China
推荐引用方式 GB/T 7714	Lee, Byoung Wan,Oh, Soo Han,Ko, Jae-Hyeon,et al. Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO(3) Single Crystals as Revealed by Brillouin Light Scattering[J]. MATERIALS,2018,11(6).
APA	Lee, Byoung Wan,Oh, Soo Han,Ko, Jae-Hyeon,Li, Xiaobing,&Luo, Haosu.(2018).Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO(3) Single Crystals as Revealed by Brillouin Light Scattering.MATERIALS,11(6).
MLA	Lee, Byoung Wan,et al."Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (Na1/2Bi1/2)TiO3-xBaTiO(3) Single Crystals as Revealed by Brillouin Light Scattering".MATERIALS 11.6(2018).