掺杂La对YFeO3 陶瓷吸波性能的影响

doi:10.11901/1005.3093.2024.301

材料研究学报

2025, Vol. 39

Issue (8): 561-568 DOI: 10.11901/1005.3093.2024.301

研究论文

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掺杂La对YFeO₃ 陶瓷吸波性能的影响

周影影¹(

), 张瑛嫺², 淡卓娅¹, 杜旭¹, 杜浩楠¹, 甄恩远¹, 罗发³

^1.西安航空学院材料工程学院西安 710077
^2.西安工业大学新能源科学与技术研究院西安 710021
^3.西北工业大学材料学院凝固技术全国重点实验室西安 710072

Influence of La Doping on Microwave Absorption Properties of YFeO₃ Ceramics

ZHOU Yingying¹(

), ZHANG Yingxian², DAN Zhuoya¹, DU Xu¹, DU Haonan¹, ZHEN Enyuan¹, LUO Fa³

^1.School of Material Engineering, Xi'an Aeronautical University, Xi'an 710077, China
^2.Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an 710021, China
^3.State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, North-western Polytechnical University, Xi'an 710072, China

引用本文:

周影影, 张瑛嫺, 淡卓娅, 杜旭, 杜浩楠, 甄恩远, 罗发. 掺杂La对YFeO₃ 陶瓷吸波性能的影响[J]. 材料研究学报, 2025, 39(8): 561-568.
Yingying ZHOU, Yingxian ZHANG, Zhuoya DAN, Xu DU, Haonan DU, Enyuan ZHEN, Fa LUO. Influence of La Doping on Microwave Absorption Properties of YFeO₃ Ceramics[J]. Chinese Journal of Materials Research, 2025, 39(8): 561-568.

全文: PDF(8571 KB) HTML

摘要:

用溶胶凝胶法和高温烧结法制备掺杂La³⁺的YFeO₃，使用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、EDS能谱仪(EDS)和网络矢量分析仪(VNA)等手段表征掺杂前后的YFeO₃，研究了掺杂La³⁺对YFeO₃的物相、组成、微观形貌、电磁参数以及吸波性能的影响。结果表明，随着La³⁺含量的提高YFeO₃的晶粒减小且晶界逐渐模糊。这个结果，可能与择优取向的增强和不完全取代有关。结果还表明，La³⁺可取代YFeO₃晶体中的Y³⁺。适量的La掺杂可提高YFeO₃陶瓷粉末的阻抗匹配和衰减系数。La掺杂使介电常数的增大，可归因于电子在Fe³⁺和Fe²⁺之间的跳跃。Y_0.7La_0.3FeO₃的有效吸收宽带(RL ≤ -10 dB)达到2.84 GHz。

关键词 ：无机非金属材料, 特种功能, 吸波材料, 掺杂改性, YFeO₃, 电磁参数

Abstract：

La-doped YFeO₃ ceramics, namely Y_1-_x La _x FeO₃ (x = 0.1, 0.2, 0.3, 0.4) were prepared by sol-gel method and high-temperature sintering method, then the YFeO₃ ceramics before and after La doping was characterized by means of scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS) and network vector analyzer (VNA). So that the effect of the La³⁺ doping amount on the micromorphology, phase constituents, chemical composition, electromagnetic parameters and microwave absorption performance of Y_1-_x La _x FeO₃ were studied. The result shows that as the La doping amount increases, the grain size is gradually decreasing and the grain boundaries are gradually blurred of the ceramics, which may be related to the enhanced preferential orientation of grains and incomplete replacement of the doping atoms. The analysis results confirm that the prepared ceramics consist merely of the YFeO₃-type phase, and La³⁺ can replace the Y³⁺ position in the YFeO₃ crystal. It is clear that an appropriate amount of La doping can effectively increase the impedance matching and attenuation coefficients of YFeO₃ ceramic powder. The increase in the dielectric constant may be attributed to the hopping of electrons between Fe³⁺ and Fe²⁺ in the case of La doping. The effective absorption broadband (RL ≤ -10 dB) of Y_0.7La_0.3FeO₃ can reach 2.84 GHz.

Key words： inorganic non-metallic materials special functional microwave absorbing materials doping modification YFeO₃ electromagnetic parameters

收稿日期: 2024-07-11

ZTFLH:

TB34

基金资助:国家科技重大专项(J2019-VI-0015-0130);陕西省青年科技新星项目(2023KJXX-075);陕西省青年创新团队项目(23JP072)

通讯作者: 周影影，教授，zhouyingying@xaau.edu.cn，研究方向为吸波材料

Corresponding author: ZHOU Yingying, Tel: (029)84255622, E-mail: zhouyingying@xaau.edu.cn

作者简介: 周影影，女，1989年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.301 或 https://www.cjmr.org/CN/Y2025/V39/I8/561

图1 用溶胶-凝胶法制备Y1-x La x FeO3的工艺流程

表1 样品原料的质量

图2 Y1-x La x FeO3的SEM照片

图3 Y1-x La x FeO3 (x = 0，0.1，0.2，0.3，0.4)的XRD谱

表2 Y1-x La x FeO3 (121)的晶面间距

图4 YFeO3、Y0.6La0.4FeO3的SEM照片和YFeO3、Y0.6La0.4FeO3对应的EDS元素分布

图5 Y1-x La x FeO3 (x = 0，0.1，0.2，0.3，0.4)的相对复介电常数的实部、虚部、介电损耗以及相对复磁导率的实部、虚部和磁损耗

图6 不同厚度的Y1-x La x FeO3的3D、2D反射损耗以及La掺杂YFeO3晶体结构的球棍模型

Parameter	x = 0	x = 0.1	x = 0.2	x = 0.3	x = 0.4
RL_min / dB	-18.00	-30.61	-27.84	-35.63	-33.55
Thickness / mm	1.8	1.6	4.2	1.6	1.8
Bandwidth (RL $≤$ -10 dB) / GHz	1.18	1.70	1.83	2.84	1.64
Thickness / mm	1.6	1.6	1.6	1.6	1.6

表3 Y1-x La x FeO3 (x = 0，0.1，0.2，0.3，0.4)的反射损耗(RL)参数

图7 Y1-x La x FeO3 (x = 0.1，0.2，0.3，0.4)的阻抗匹配系数(Z)和衰减常数(α)

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