无机材料学报 ›› 2022, Vol. 37 ›› Issue (1): 79-85.DOI: 10.15541/jim20210212
所属专题: 【信息功能】电介质材料
收稿日期:
2021-03-29
修回日期:
2021-04-20
出版日期:
2022-01-20
网络出版日期:
2021-07-20
通讯作者:
张媛媛, 副教授. E-mail: yyzhang@ee.ecnu.edu.cn
作者简介:
李 胜(1996-), 男, 硕士研究生. E-mail: 51181213007@stu.ecnu.edu.cn
基金资助:
LI Sheng(), SONG Guoqiang, ZHANG Yuanyuan(
), TANG Xiaodong
Received:
2021-03-29
Revised:
2021-04-20
Published:
2022-01-20
Online:
2021-07-20
Contact:
ZHANG Yuanyuan, associate professor. E-mail: yyzhang@ee.ecnu.edu.cn
About author:
LI Sheng (1996-), male, Master candidate. E-mail: 51181213007@stu.ecnu.edu.cn
Supported by:
摘要:
多铁材料在新型器件领域的应用非常广泛, 其研究已成为当今材料研究领域的热点之一。钛酸钡(BaTiO3, BTO)在室温下具有较强的铁电性、高介电常数和电光特性等丰富的物理性能, 吸引了科研人员对其进行多铁化的研究。本工作通过固相烧结法制备BTO和BaTi0.94(TM1/2Nb1/2)0.06O3(TM = Mn/Ni/Co)陶瓷, 系统研究了B位共掺杂对陶瓷的生长特性与电学、磁学和光学方面的影响。实验结果表明: 掺杂有效抑制了六方相的产生, 样品晶体结构由四方相向立方相转变, 不同元素离子半径的差异使得相变的程度有所不同。通过拉曼散射发现BTO基陶瓷四方相的特征峰变弱, 进一步证明了共掺杂导致四方相减少。介电温谱表明BaTi0.94(TM1/2Nb1/2)0.06O3的居里温度(TC)也较BTO有大幅度降低, 同时样品的铁电性虽然也明显削弱, 但是还保持有较好的铁电性, 这些都和晶体结构的相变程度密切相关。磁性测试结果表明: 在三组共掺组分中, Ni-Nb共掺杂具有最好的室温铁磁性, 铁磁性的形成机制可以通过F中心交换(F-center exchange, FCE)理论来解释。与BTO相比, BaTi0.94(TM1/2Nb1/2)0.06O3的带隙明显减小, 这主要是因为掺杂产生杂质能级使带隙减小, 与能带理论吻合。上述结果表明: 通过B位共掺杂可以获得室温下铁电性与铁磁性共存的BTO基多铁陶瓷, 有望在多铁性功能器件中获得更广泛的应用。
中图分类号:
李胜, 宋国强, 张媛媛, 唐晓东. BTO基多铁陶瓷的制备及物理性能研究[J]. 无机材料学报, 2022, 37(1): 79-85.
LI Sheng, SONG Guoqiang, ZHANG Yuanyuan, TANG Xiaodong. Preparation and Physical Property of BTO-based Multiferroic Ceramics[J]. Journal of Inorganic Materials, 2022, 37(1): 79-85.
图3 在1 kHz~1 MHz频率范围BTO系列陶瓷的介电常数(a~d)和损耗与温度的关系(e)
Fig. 3 Temperature dependence of dielectric constant (a-d) and loss (e) of BTO series ceramics in the frequency range from 1 kHz to 1 MHz
Sample | EC/(kV·cm-1) | Pr/(μC·cm-2) | Ps/(μC·cm-2) |
---|---|---|---|
BTO | 4.3 | 13.24 | 28.7 |
BTMNO | 1.22 | 5.85 | 19.1 |
BTNNO | 0.67 | 0.55 | 15.5 |
BTCNO | 1.85 | 6.02 | 19.9 |
表1 电滞回线中各物理参数
Table 1 Physical parameters in the electric hysteresis loop
Sample | EC/(kV·cm-1) | Pr/(μC·cm-2) | Ps/(μC·cm-2) |
---|---|---|---|
BTO | 4.3 | 13.24 | 28.7 |
BTMNO | 1.22 | 5.85 | 19.1 |
BTNNO | 0.67 | 0.55 | 15.5 |
BTCNO | 1.85 | 6.02 | 19.9 |
图5 300 K下, BTO系列陶瓷磁化曲线(a-d)和去除顺磁部分后的磁化曲线(e)
Fig. 5 Isothermal magnetization of BTO series ceramics at 300 K (a-d) and isothermal magnetization loops after subtracting the paramagnetic contributions of samples (e) Colourful figures are available on website
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