Microstructure and Properties of Bi-doped Yttrium Iron Garnet Magneto-optical Ceramics Prepared by Hot-pressing Sintering Process

doi:10.15541/jim20210603

Abstract

Abstract:

Yttrium iron garnet (Y₃Fe₅O₁₂, YIG) materials with excellent magnetic and magneto-optical performances have been widely used in various fields such as the microwave communication, laser technology and optical fiber communication. Ion doping is considered as an effective method to improve the magneto-optical performance of YIG materials. In this study, Bi³⁺ with appropriate ion radius were selected to modify YIG ceramics to improve the magneto-optical properties of the materials. A series of Bi_xY_3-_xFe₅O₁₂ (x=0, 0.3, 0.6, 0.9) ceramics were prepared by the hot-pressing sintering process with the solid-state reaction. Phase structure, micro-morphology, infrared transmittance, magnetic and magneto-optical properties of the sintered Bi_xY_3-_xFe₅O₁₂ (x=0, 0.3, 0.6, 0.9) ceramics were investigated. All sintered Bi³⁺-doped YIG ceramic samples exhibit the pure garnet phase structure with dense microstructure, and the grain size increases with Bi³⁺ doping. The infrared transmittance of the sample is good, but it decreases with the increase of Bi³⁺ doping content. The Faraday rotation angle of the YIG ceramic sample changes linearly with the Bi³⁺ content increase. When the Bi³⁺ content increases about 1% (in atom), Faraday rotation angle changes about -49.0 (°)/cm and -30.2 (°)/cm at 1064 nm and 1550 nm wavelengths, respectively. Faraday rotation angles of Bi_0.6Y_2.4Fe₅O₁₂ceramic sample at wavelengths of 1064 nm and 1550 nm are -703.3 (°)/cm and -461.5 (°)/cm, respectively, which are much higher than that of the undoped YIG ceramics (277.6 (°)/cm and 172.0 (°)/cm, respectively). The magneto-optical performance of YIG ceramics is enhanced obviously by the Bi³⁺ doping.

Key words: yttrium iron garnet, magneto-optical ceramics, Bi-doped, infrared transmittance, Faraday rotation

CLC Number:

TM284

ZOU Shun, HE Xiyun, ZENG Xia, QIU Pingsun, LING Liang, SUN Dazhi. Microstructure and Properties of Bi-doped Yttrium Iron Garnet Magneto-optical Ceramics Prepared by Hot-pressing Sintering Process[J]. Journal of Inorganic Materials, 2022, 37(7): 773-779.

Figures/Tables 9

Fig. 1 Density of BixY1-xFe5O12 ceramic samples varies with sintering temperatures (a) and photos of BixY1-xFe5O12 samples (b)

Fig. 2 Infrared transmittance curves of BixY1-xFe5O12 samples sintered at different temperatures (d=0.4 mm) Colorful figures are available on website

Table 1 Sintering temperatures of the samples with the highest density and the highest transmittance

Bi_xY_1-_xFe₅O₁₂	Sintering temperature of the sample with the highest density/℃	Sintering temperature of the sample with the highest transmittance/℃
x=0	1300	1300
x=0.3	1250	1250
x=0.6	1250	1150
x=0.9	1150	1050

Fig. 3 Best infrared transmittance curves of BixY1-xFe5O12 samples with Bi3+ doping (d=0.4 mm) Colorful figures are available on website

Fig. 4 XRD patterns of BixY1-xFe5O12 (x=0, 0.3, 0.6, 0.9) samples (a) and the detail map at 2θ=68°-70° (b)

Fig. 5 Cross-section SEM images of the BixY1-xFe5O12 ceramic samples

Fig. 6 SEM image (a) and EDS patterns of the Bi0.9Y2.1Fe5O12 ceramics sintered at 1050 ℃ (b, c) corresponding to the site of A and B in (a), respectively

Fig. 7 Schematic diagram of Faraday rotation angle test equipment (a), hysteresis loops (b) of BixY1-xFe5O12 samples, and Faraday rotation angle of the ceramic sample varies with the proportion of bismuth at 1064 and 1550 nm (c) Colorful figures are available on website

Table 2 Magnetic performance parameters of the sintered BixY1-xFe5O12 samples with different amounts of Bi3+doping

x	Residual magnetization, 4πM_r/T	Saturation magnetization, 4πM_s/T	Coercive field, H_c/ (A·m^-1)
0	1.32×10^-2	0.1543	6029.6
0.3	6.59×10^-3	0.1577	369.2
0.6	5.02×10^-4	0.1596	310.4
0.9	2.86×10^-4	0.1536	179.8

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