Structural, Thermal, and Optical Properties of GeO2-La2O3-TiO2 Glasses

doi:10.15541/jim20230068

Abstract

Abstract:

La₂O₃-TiO₂ glasses show promising application prospect in fields of lenses, optical windows, and optical communication, owing to their high refractive index and excellent performance. However, this glass cannot be prepared into large size because of its weak glass forming ability, which seriously limits its application. In this study, introducing the network former GeO₂ can effectively improve the glass forming ability, so that large-sized GeO₂-La₂O₃-TiO₂ (GLT) glass can be prepared using conventional methods. Differential thermal analysis shows that GLT glasses have high glass transition temperature (T_g) and strong resistance to precipitation, with T_g and ΔT (T_c-onset-T_g) greater than 833 and 209 ℃, respectively. The refractive index is up to 2.06. The transmittance can reach 78% in the visible and near-infrared wavelength bands. The glass forming ability and thermal stability can be weakened by increasing the content of TiO₂. The molar volume and oxygen electron polarizability exhibit the same variation trends as the refractive index of the samples. This result is important for developing new devices with high performance, light weight, and small size.

Key words: high refractive index, thermal stability, large size glass, high transmittance

CLC Number:

TQ171

WAN Jiabao, ZHANG Minghui, SU Huaiyu, CAO Zhijun, LIU Xuechao, XIE Jiansheng, WANG Xiangyuan, SHI Yinghui, WANG Liang, LEI Shuijin. Structural, Thermal, and Optical Properties of GeO₂-La₂O₃-TiO₂ Glasses[J]. Journal of Inorganic Materials, 2023, 38(10): 1230-1236.

Figures/Tables 7

Fig. 1 DTA curves of GLT-(1-5) glasses (a) DTA curves of the GLT-(1-5) glasses; (b) DTA curve of the GLT-3 glass with inset showing an enlarged view of the glass transition; (c) Glass transition temperature Tg and crystallization onset temperature Tx varied with the change of the glasses composition with inset showing the difference of ΔT (ΔT=Tx−Tg)

Fig. 2 XRD patterns of GLT-(1-5) glasses

Fig. 3 Raman scattering spectra of GLT-(1-5) glasses at room temperature Colorful figure is available on website

Fig. 4 Optical transmittance spectra of GLT-(1-5) glasses (a) UV-Vis; (b) MIR region Colorful figures are available on website

Fig. 5 Refractive index curves (a) of GLT-(1-5) glasses at 300-800 nm wavelength, the dependence (b) of refractive index nd and Abbe number on the TiO2 content Colorful figures are available on website

Fig. 6 Dependence of density of GLT-(1-5) glasses on glass compositions

Table 1 Density, molar volume and oxygen ions polarizability of GLT-(1-5) glasses

Sample	TiO₂ content/ % (in mol)	Weight, m/g	True density, ρ/(g·cm^-3)	Molar volume, V_m/(cm³·mol^-1)	Electron polarizability of oxygen, α_O/(×10^-3, nm³)
GLT-1	45	4.8063	5.02	30.06	2.388
GLT-2	47	4.4328	5.06	29.72	2.389
GLT-3	49	4.5602	5.05	29.67	2.406
GLT-4	51	4.2007	5.01	29.86	2.406
GLT-5	53	4.7872	5.00	29.82	2.420

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Structural, Thermal, and Optical Properties of GeO₂-La₂O₃-TiO₂ Glasses

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