Synthesis, Structure and Thermochromic Properties of Al-doped Sm3Fe5O12 Garnets†

doi:10.7503/cjcu20160736

Abstract

Abstract:

A series of Sm₃Fe_5-_xAl_xO₁₂(x=0, 0.1, 0.3, 0.5) samples was prepared via high-temperature solid state method and characterized by powder X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(IR), X-ray photoelectron spectroscopy(XPS), UV-Vis-NIR spectroscopy. The results showed that all the samples are pure phase and Fe—O bonds are the main chromatic groups. The colors of all the samples(x=0, 0.1, 0.3, 0.5) turned from yellowish-green at room temperature to reddish brown at higher temperature(240 ℃).

Key words: Sm3Fe5O12 garnet, Solid-state reaction, Thermochromism

CLC Number:

O611

TrendMD:

QI Hui, LIU Huanhuan, WANG Shan, YUAN Long, HOU Changmin. Synthesis, Structure and Thermochromic Properties of Al-doped Sm₃Fe₅O₁₂ Garnets^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 535.

Figures/Tables 8

Fig.1 Powder XRD patterns of the as-prepared Sm3Fe5-xAlxO12[x=0(A), 0.1(B), 0.3(C), 0.5(D)]

Table 1 Refinement results of Sm3Fe5-xAlxO12

Sample	Space group	Lattice parameter/nm	Volume/nm³	R_wp(%)	R_p(%)
Sm₃Fe₅O₁₂	Ia $3 ˉ$ d	1.25350(4)	1.96958	7.59	5.73
Sm₃Fe_4.9Al_0.1O₁₂	Ia $3 ˉ$ d	1.25257(1)	1.96520	12	7.28
Sm₃Fe_4.7Al_0.3O₁₂	Ia $3 ˉ$ d	1.25108(6)	1.95819	9.93	6.51
Sm₃Fe_4.5Al_0.5O₁₂	Ia $3 ˉ$ d	1.25026(2)	1.95434	10.18	6.76

Table 1 Refinement results of Sm3Fe5-xAlxO12

Sample	Space group	Lattice parameter/nm	Volume/nm³	R_wp(%)	R_p(%)
Sm₃Fe₅O₁₂	Ia $3 ˉ$ d	1.25350(4)	1.96958	7.59	5.73
Sm₃Fe_4.9Al_0.1O₁₂	Ia $3 ˉ$ d	1.25257(1)	1.96520	12	7.28
Sm₃Fe_4.7Al_0.3O₁₂	Ia $3 ˉ$ d	1.25108(6)	1.95819	9.93	6.51
Sm₃Fe_4.5Al_0.5O₁₂	Ia $3 ˉ$ d	1.25026(2)	1.95434	10.18	6.76

Fig.2 Crystal lattice parameter evolution with increasing Al doping amount

Fig.3 SEM images of Sm3Fe5-xAlxO12(A) x=0; (B) x=0.1; (C) x=0.3; (D) x=0.5.

Fig.4 Fe2p XPS spectra of Sm3Fe5-xAlxO12(A) x=0; (B) x=0.1; (C) x=0.3; (D) x=0.5.

Fig.5 FTIR spectra(A), excitation(B) and emission(C) spectra of Sm3Fe5-xAlxO12 a. x=0; b. x=0.1; c. x=0.3; d. x=0.5.

Fig.6 Photographs of Sm3Fe5-xAlxO12 at different temperatures and CIE-L*ab parameters (A) x=0; (B) x=0.1; (C) x=0.3; (D) x=0.5.

Fig.7 Temperature dependent UV-Vis spectra of Sm3Fe5-xAlxO12(A) x=0; (B) x=0.1; (C) x=0.3; (D) x=0.5. Insets of up-right and down-left show the enlarged spectra of 486—592 nm and 600—800 nm, respectively. Temperature/℃: a. 20; b. 40; c. 80; d. 120; e. 160; f. 200; g. 240.

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Synthesis, Structure and Thermochromic Properties of Al-doped Sm₃Fe₅O₁₂ Garnets^†

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