文章信息/Info

Title:

Research Progress on Thermal Stability of Polarization Performance in Bismuth Sodium Titanate-Based Lead-Free Ceramics

文章編號:

1674-3962(2021)08-0587-09

作者:

任鵬榮; 王家樂

（西安理工大學(xué)材料科學(xué)與工程學(xué)院，陜西 西安 710048）

Author(s):

REN Pengrong;  WANG Jiale

(School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China)

關(guān)鍵詞:

鈦酸鉍鈉; 退極化溫度; 摻雜; 復(fù)合; 淬火

Keywords:

Bi0.5Na0.5TiO3;  depolarization temperature;  doping;  composites;  quenching

分類號:

TM282

DOI:

10.7502/j.issn.1674-3962.202106001

文獻(xiàn)標(biāo)志碼:

A

摘要:

鈦酸鉍鈉（Bi0.5Na0.5TiO3, 簡稱BNT）陶瓷是一種A位復(fù)合鈣鈦礦無鉛壓電材料，其具有高居里溫度、大電致應(yīng)變、良好的弛豫特性和機(jī)電耦合性能等特點(diǎn)，特別是其機(jī)械品質(zhì)因數(shù)隨溫度升高和振動速率的增加保持穩(wěn)定，相對于商用的鉛基壓電陶瓷Pb(Zr,Ti)O3（PZT）具有一定的優(yōu)勢，有望應(yīng)用于致動器、濾波器、超聲換能器等領(lǐng)域。但是，較低的退極化溫度（Td）限制了BNT基材料的實(shí)際應(yīng)用，因此，研究出具有高Td的無鉛壓電陶瓷具有重要意義。綜述了BNT基陶瓷的退極化行為與改善極化性能熱穩(wěn)定性的3種方法：元素?fù)诫s、第二相復(fù)合及淬火處理，介紹了這3種方法的最新研究進(jìn)展，并對每一種方法的改性機(jī)理相關(guān)研究進(jìn)行了闡述，提出了亟待解決的問題，為后續(xù)進(jìn)一步提高BNT及其他無鉛壓電陶瓷的Td提供參考。

Abstract:

Bi0.5Na0.5TiO3 (BNT) is a lead-free piezoelectric material with A-site complex perovskite structure. It exhibits high Curie temperature, large electric field induced strain, special relaxor properties and large thickness mode electromechanical coupling factors. Specifically, it shows stable mechanical quality factor with the variance of temperature and vibration velocity in comparison with Pb(Zr,Ti)O3 (PZT). Thus, BNT based ceramics are expected to be applied in actuators, filters, ultrasonic transducers and other fields. However, they still have some problems, for example, low depolarization temperature (Td) making the operational temperature range of devices narrow, which limits the practical application of BNT-based materials. Therefore, the research of lead-free piezoelectric ceramics with high Td has great prospects in future. This article has reviewed depolarization behavior of BNT-based ceramic materials and three methods of increasing Td: elemental doping, composites with the second phase and quenching heat treatment, introduced the latest research progress of these methods and their mechanisms, and finally put forward several problems to be solved urgently. This review may provide a reference for further improvement of Td of BNT and other lead-free piezoelectric ceramics.