납이 포함되지 않은 압전 특성의 (Na 1/2 Bi 1/2 TiO 3 ) (1-x) -(BaTiO 3 ) x 상전이 거동 연구

• 영문명: Phase Transition Behaviors of Lead-Free Piezoelectric (Na 1/2 Bi 1/2 TiO 3 ) (1-x) -(BaTiO 3 ) x
• 발행기관: 한국세라믹학회
• 저자명: 이병완(Byoungwan Lee) Haosu Luo 김정규(, Jung Kyu Kim)
• 간행물 정보: 『세라미스트』제23권 제1호, 101~109쪽, 전체 9쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2020.03.30

영문 초록

In this study, the phase transition behaviors of lead-free (Na 1/2 Bi 1/2 TiO 3 ) (1-x) -(BaTiO 3 ) x (NBT-BT) are investigated by using Brillouin spectroscopy. The elastic properties, sound velocity and absorption coefficient of NBT-BT are characterized as a function of temperature along different crystallographic axes. The temperature dependences of the elastic constants of NBT-BT near the morphotropic phase boundary are determined for the first time. The unpoled NBT-BT single crystals exhibits the typical relaxor behaviors, presenting broad acoustic and dielectric anomalies. The application of electric field induced discontinuous changes in the elastic properties at ~110℃, which indicates field-induced phase transition occurred. The electric field also changes the dielectric constant from more relaxor-like to ferroelectric-like dielectric behavior.

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키워드

brillouin spectroscopy lead-free piezoelectric relaxor ferroelectrics phase transition