硅酸盐学报

Sm掺杂量对Pb（Mg_1/3Nb_2/3）O₃-PbTiO₃弛豫铁电体场诱应变温度稳定性的影响

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袁欢 , 凌志远

硅酸盐学报 | 研究论文 2024,52(9): 2900-2906

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硅酸盐学报 |研究论文 2024 , 52 (9) : 2900 -2906

Sm掺杂量对Pb（Mg_1/3Nb_2/3）O₃-PbTiO₃弛豫铁电体场诱应变温度稳定性的影响

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袁欢, 凌志远

作者信息

华南理工大学材料科学与工程学院，广州 510640

通讯作者:

凌志远（1965-），男，教授。

作者简介:

袁欢（1999-），女，硕士研究生。

Effect of Sm Doping on Temperature Stability of Field-Induced Strain in Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ Ceramics

Huan YUAN, Zhiyuan LING

Affiliations

Department of Electronic Materials Science and Engineering, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding Author:

LING Zhiyuan (1965-), male, Ph.D., Professor. E-mail: imzyling@scut.edu.cn.

YUAN Huan (1999-), female, Master candidate. E-mail: yhuan0315@163.com.

出版时间: 2024-09-20 doi: 10.14062/j.issn.0454-5648.20240059

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摘要

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Pb（Mg_1/3Nb_2/3）O₃-PbTiO₃（PMN-PT）弛豫铁电材料因场诱应变大且滞后小而成为制备微位移致动器的优选材料，然而场诱应变的温度依赖性阻碍了其进一步发展。针对这一问题，以两步氧化物固相反应法制备了不同Sm掺杂量的PMN-0.32PT陶瓷，研究了掺杂量对场诱应变温度稳定性的影响。结果表明，Sm³⁺的掺入打破了晶格的长程有序，增大了微区化学成分的不均匀性，宏观上表现出强烈的介电频率色散，大量纳米畴及极性纳米区域的出现使样品展现出大场诱应变和高温度稳定性。受PMN弥散相变影响，温度低于-15 ℃场诱应变很小，高于-15 ℃场诱应变迅速增大。在1 kV/mm单向电场驱动下，x=0.040样品的径向场诱应变在-10~+50 ℃间高达4.2×10^-4，变化率小于3.8%，滞后小于13.1%，展现出良好的应用前景。

关键词

弛豫铁电体 / 铌镁酸铅-钛酸铅 / 场诱应变 / 温度稳定性 / 钐掺杂

Abstract

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Introduction

Micro-displacement actuators are widely used in micromachining, precision measurement, aerospace and biomedical. The performance of micro-displacement actuators can be evaluated in terms of displacement, hysteresis, linearity and temperature stability. For a long time, researchers have been hoping to obtain a ferroelectric material with high field-induced strain, low hysteresis and good temperature stability for a variety of different applications. Pb(Mg_1/3Nb_2/3)O₃ (PMN) is a typical perovskite type relaxor ferroelectric, and PMN-PbTiO₃ (PT) solid solution possesses a morphotropic phase boundary (MPB) region from PT mole fractions of 0.27 to 0.35. The field-induced strain and hysteresis of PMN-PT could meet the requirements of high-performance micro-displacement actuators. However, the temperature stability of field-induced strain still needs to be improved before practical application. In this work, effect of Sm³⁺ doping on the temperature stability of field-induced strain in PMN-0.32PT ceramics was investigated.

Method

Experimental samples of nominal composition Pb_1-1.5_xSm_x[(Mg_1/3Nb_2/3)_0.68Ti_0.32]O₃ (xSm-PMN-0.32PT, x=0, 0.020, 0.030, 0.035, 0.040, 0.045, 0.050) were prepared via a two-step columbite precursor method. The sintered disks were sintered at 750 ℃ for 15 min, poled in silicone oil bath under 1 kV/mm for 10 min at room temperature. The electrochemical properties of sintered samples were measured 24 h late after poling. The crystal structure of sintered samples was determined by PANalytical X'Pert3 X-ray diffractometer (XRD) at room temperature. The dielectric, piezoelectric, ferroelectric and resonant properties of sintered samples were measured by TH2816A LCR meter, ZJ-3 quasi-static d₃₃ meter, Radiant Precision Multiferroic Materials Analyzer and ZX80A impedance analyzer, respectively. The field-induced strain of sintered samples was measured using LVDT linear variable differential transformer probe controlled by MDS micro-displacement meter and Keithley 2 410 source meter. The temperature environment was provided by GZ-ESPEC MC710P environmental test chamber.

Results and discussion

All samples exhibited typical perovskite phase, and the chemical compositions of them were similar as that of MPB, a mixture of rhombohedral R, monoclinic M_C, monoclinic M_B and tetragonal T phases. The MPB shifted towards to the PMN-rich direction with the increase of x value. The dielectric temperature spectra showed that the dispersion coefficient (γ) increased slightly with the increase of x, 1.374 ≤γ ≤1.67. As the frequency increased, values of ε_r-m shifted to a higher temperature and the frequency dispersion increased significantly with the increased x value. d₃₃ values decreased from 929 pC/N at x=0.020 to 546 pC/N at x = 0.050. These results indicate that all samples are relaxor ferroelectrics. The substitution of Sm³⁺ for Pb²⁺ broke the long-range ordering of lattice, resulted in the existence of numerous nanodomains below depolarization temperature (T_d), and the spontaneous polarization vector was more easily switchable with external electric field. The ferroelectric properties showed that both the remanent polarization (P_r) and coercive field (E_C) decreased monotonically with increased x value. In addition, the maximum value of field-induced strain (S_m) was very small at low temperature, but increasesd rapidly nears -10 ℃. The temperature stability of S_m for x=0.040 sample was much better than other samples when temperature ranged between -10 ℃ to +60 ℃. It is known that the ferroelectric domains in relaxor ferroelectric would be gradually into the small domains with increased temperature, which were easily oriented for external electric field. The field-induced strain was the largest near T_d, but decreased sharply when the temperature was higher than T_d. For xSm-PMN-0.32PT ceramics, value of T_d shifted to lower temperature due to substitution of Sm³⁺ for Pb²⁺, and T_d also showed a broad distribution due to the increased inhomogeneity of chemical composition in the microregion. As the temperature approached the T_d of certain microregions, the ferroelectric domains will be gradually cleaved into the small domains, and thus the field-induced strain will show good stability over a wide temperature range. As the field-induced strain decayed remarkedly below -10 ℃, it may be related to the diffuse phase transition of PMN.

Conclusions

PMN-PT was the preferred material for micro-displacement actuators due to its high field-induced strain and low hysteresis. The substitution of Sm³⁺ for Pb²⁺ broke the long-range ordering of lattice, increased the inhomogeneity of chemical composition in the microregion, resulted in a strong dielectric frequency dispersion, and the appearance of numerous nanodomains and polar nanoregions made samples exhibit large field-induced strains and high temperature stability. The field-induced strain was much smaller below -15 ℃ and increased rapidly near -10 ℃ under the influence of diffuse phase transition of PMN. A field-induced strain of 4.2×10^-4 and hysteresis of less than 13.1% in x=0.040 sample were achieved with excellent temperature stability that the strain fluctuation was smaller than 3.8% in the temperature between -10 ℃ and +60 ℃.

Key words

relaxor ferroelectric / lead magnesium niobate-lead titanate / field-induced strain / temperature stability / samarium doping

引用本文

袁欢, 凌志远. Sm掺杂量对Pb（Mg_1/3Nb_2/3）O₃-PbTiO₃弛豫铁电体场诱应变温度稳定性的影响. 硅酸盐学报, 2024 , 52 (9) : 2900 -2906 . DOI: 10.14062/j.issn.0454-5648.20240059

Huan YUAN, Zhiyuan LING. Effect of Sm Doping on Temperature Stability of Field-Induced Strain in Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ Ceramics[J]. Journal of the Chinese Ceramic Society, 2024 , 52 (9) : 2900 -2906 . DOI: 10.14062/j.issn.0454-5648.20240059

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广东省产学研合作专项行动计划(2019B090908005)

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2024年第52卷第9期

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doi: 10.14062/j.issn.0454-5648.20240059

接收时间：2024-01-23
首发时间：2026-10-22
出版时间：2024-09-20

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收稿日期：2024-01-23
修回日期：2024-03-06

基金

广东省产学研合作专项行动计划(2019B090908005)

作者信息

华南理工大学材料科学与工程学院，广州 510640

通讯作者:

凌志远（1965-），男，教授。

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https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20240059

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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