Reporting Excellent Transverse Piezoelectric and Electro‐Optic Effects in Transparent Rhombohedral PMN‐PT Single Crystal by Engineered Domains

Transparent ferroelectric crystals with high piezoelectricity are challenging to build because of their complex structure and disordered domains in rhombohedral relaxor ferroelectrics. There are eight domains along the direction, which cause light scattering. In this study, perfect transparency is a...

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Published in:Advanced materials (Weinheim) Vol. 33; no. 43; pp. e2103013 - n/a
Main Authors: Deng, Chenguang, Ye, Lianxu, He, Chongjun, Xu, Guisheng, Zhai, Qinxiao, Luo, Haosu, Liu, Youwen, Bell, Andrew J.
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 01.10.2021
Subjects:
Birefringence
Crystal structure
Crystals
domain engineering
electro‐optic effect
Ferroelectric crystals
Ferroelectric domains
Ferroelectric materials
Ferroelectricity
Materials science
Microscopy
Piezoelectricity
PMN‐PT
Single crystals
transparent ferroelectrics
transverse modulation
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:Transparent ferroelectric crystals with high piezoelectricity are challenging to build because of their complex structure and disordered domains in rhombohedral relaxor ferroelectrics. There are eight domains along the direction, which cause light scattering. In this study, perfect transparency is achieved along the [110] and [001] directions in [110]‐poled rhombohedral 0.72Pb(Mg1/3Nb2/3)O3‐0.28PbTiO3 (PMN‐PT) crystals, which have a high d31 value of 1700 pC N−1 and a high electro‐optic coefficient γ33 of 320 pm V−1. This implies that the [110]‐oriented rhombohedral PMN‐0.28PT crystal can realize the mode of transverse modulation, whereas the [001]‐oriented PMN‐0.28PT crystal is more suitable for the longitudinal mode. Through piezoresponse force microscopy (PFM), it is confirmed that the [110]‐poled rhombohedral PMN‐PT crystals form 71° layered domains, which are similar to the 109° layered domains of the [001]‐oriented transparent crystal. Combined with PFM and birefringence microscopy, the degradation of domains and thickness dependence of piezoelectricity provide clear evidence for the relationship between the engineered domain structures and piezoelectric properties, which should be considered in the design of piezoelectric or electro‐optic devices with excellent performance. This work enriches the research on ferroelectric domain engineering for excellent transparency and high piezoelectricity to provide new ideas for photoacoustic devices. Perfect transparency is achieved along the [110] and [001] directions in [110]‐poled rhombohedral PMN‐PT crystals, which have a high d31 value of 1700 pC N−1 and a high electro‐optic coefficient γ33 of 320 pm V−1. This implies that the [110]‐oriented rhombohedral PMN‐PT crystal can realize the mode of transverse modulation.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202103013