Effect of Sb on Structure and Physical Properties of GeSbxSe7-x Chalcogenide Glasses

doi:10.15541/jim20140097

Abstract

Abstract:

GeSb_xSe_7-_x (x = 0.4, 0.8, 1.2, 1.6, 2.0) chalcogenide glasses were prepared by the melt-quenching technique, and the effect of Sb on glass structures and physical properties were systematically investigated. Raman spectra of these glasses show that the glass structure gradually changes from Se chains or Se rings dominated to SbSe_3/2 pyramids and GeSe_4/2 tetrahedra cross-linked, and the degree of cross-linkage of glass network improves with Sb content increase. Meanwhile, the glass transition temperature, density, elastic moduli, and refractive index increase with Sb content increase. The transmittance spectra indicate that replacement of Se with Sb leads to gradually reducing the optical bandgap.

Key words: Ge-Sb-Se, chalcogenide glass, Raman spectrum, elastic moduli, refractive index, glass transition

CLC Number:

TB484

WEI Wen-Hou, FANG Liang, YANG Zhi-Yong, SHEN Xiang. Effect of Sb on Structure and Physical Properties of GeSb_xSe_7-_x Chalcogenide Glasses[J]. Journal of Inorganic Materials, 2014, 29(11): 1218-1222.

Figures/Tables 6

Fig. 1 Raman spectra of GeSbxSe7-x glasses

Fig. 2 DSC curves of GeSbxS7-x glasses

Fig. 3 Density, shear elastic modulus (Cs) and compression elastic modulus (Cc) of GeSbxSe7-x glasses

Table 1 Glass transition temperature (Tg), density (ρ), average molar volume (), shear elastic modulus (Cs), compression elastic modulus (Cc), refractive index (n), direct optical band gap (Eoptd) and indirect optical band gap (Eopti) of GeSbxSe7-x glasses

GeSb_xSe_7-_x	T_g / ℃	ρ / (g·cm^-3)	/ (cm³·mol^-1)	C_s/(0.1 GPa)	C_c / (0.1 GPa)	n	E_optd / eV	E_opti / eV
x=0.4	118.9	4.479	17.93	64.346	186.783	2.529	1.64	1.54
x=0.8	139.9	4.613	17.87	66.633	205.459	2.610	1.58	1.47
x=1.2	159.0	4.758	17.78	71.225	228.572	2.702	1.53	1.42
x=1.6	183.1	4.873	17.75	77.619	241.562	2.803	1.47	1.37
x=2.0	243.8	5.009	17.74	82.945	251.312	2.933	1.42	1.32

Fig. 4 Transmittance in the region of Vis-NIR (a) and IR (b) of GeSbxSe7-x glasses

Fig. 5 (a) The plots of (αhν)2 vs hν (photon energy) and (b) the plots of (αhν)1/2 vs hν of GeSbxSe7-x glasses

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