Influence of La Doping on Microwave Absorption Properties of YFeO3 Ceramics

doi:10.11901/1005.3093.2024.301

Chinese Journal of Materials Research

2025, Vol. 39

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

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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

Cite this article:

ZHOU Yingying, ZHANG Yingxian, DAN Zhuoya, DU Xu, DU Haonan, ZHEN Enyuan, LUO Fa. Influence of La Doping on Microwave Absorption Properties of YFeO₃ Ceramics. Chinese Journal of Materials Research, 2025, 39(8): 561-568.

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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

Received: 11 July 2024

ZTFLH:

TB34

Fund: National Science and Technology Major Project(J2019-VI-0015-0130);Shaanxi Province Youth Science and Technology New Star Project(2023KJXX-075);Youth Innnovation Team of Shaanxi Province Project(23JP072)

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

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	ZHOU Yingying
	ZHANG Yingxian
	DAN Zhuoya
	DU Xu
	DU Haonan
	ZHEN Enyuan
	LUO Fa

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.301 OR https://www.cjmr.org/EN/Y2025/V39/I8/561

Fig.1 Process of preparing Y_1-_x La _x FeO₃ by sol-gel method

Table 1 Raw material quality of each samples

Fig.2 SEM images of Y_1-_x La _x FeO (a) YFeO₃, (b) Y_0.9La_0.1FeO₃, (c) Y_0.8La_0.2FeO₃, (d) Y_0.7La_0.3FeO₃, (e) Y_0.6La_0.4FeO₃

Fig.3 XRD patterns of Y_1-_x La _x FeO₃ (x = 0, 0.1, 0.2, 0.3, 0.4) (a) 20°-80° diffraction pattern, (b) Magnification of 32°-35° diffraction peak

Table 2 Crystal surface spacing of (121) of Y_1-_x La _x FeO₃

Fig.4 SEM images of YFeO₃(a), Y_0.6La_0.4FeO₃(c); EDS element distribution map of YFeO₃ (b) and Y_0.6La_0.4FeO₃ (d)

Fig.5 Real part (ε′) (a), imaginary part (ε′′) (b), dielectric loss and relative complex permeability (c) and real part (μ′) (d), imaginary part (μ′′) (e), magnetic loss (f) of relative complex permittivity of Y_1-_x La _x FeO₃ (x = 0, 0.1, 0.2, 0.3, 0.4)

Fig.6 Reflection loss of Y_1-_x La _x FeO₃ at different thicknesses (a, a1) x = 0, (b, b1) x = 0.1, (c, c1) x = 0.2, (d, d1) x = 0.3, (e, e1) x = 0.4, (f) RL value at a thickness of 1.6 mm, (g) Ball rod model of La doped YFeO₃ crystal structure

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

Table 3 Reflection loss (RL) parameters of Y_1-_x La _x FeO₃ (x = 0, 0.1, 0.2, 0.3, 0.4)

Fig.7 Impedance matching coefficient (Z) (a) and attenuation constant (b) of Y_1-_x La _x FeO₃ (x = 0.1, 0.2, 0.3, 0.4)

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