School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China
Cite this article:
Tingting JIA,Zengyun JIAN,Junfeng XU,Man ZHU,Fang'e CHANG. CHARACTERISTIC TEMPERATURE AND PERFOR-MANCE OF THE Ge30Se70 CHALCOGENIDE GLASS. Acta Metall Sin, 2016, 52(6): 755-760.
Chalcogenide glass is an ideal infrared wave-transparent material, and it has the advantages of low cost, high production efficiency, high glass transition temperature and good mechanical properties, etc.. It is a candidate material for thermal imaging system. The block sample of Ge30Se70 chalcogenide glass was prepared by the method of the melt-quenched. In this work, XRD was used to determine whether the sample was amorphous material. With the DSC thermal analysis method, the glass transition temperature Tg and the initial crystallization temperature Tx of the sample were measured. The dynamics ideal glass transition temperature T0 of the specimen was fitted by VFT equation. The method of segmented step heating is used to analyze the calorific value for the glass and congruent crystal of Ge30Se70 sample in setting temperature range. Then from the calculated calorific values of the glass and crystalline samples, the specific heat capacity relationships were obtained, i.e., cp,l=0.0002T+0.3337 and cp,c=0.00006T+0.4594. The results show that Tg and T0 of Ge30Se70 sample is 590 and 581 K, respectively. And Tg will increase with the increasing of the heating rate R. The average value of the specific heat capacity of the Ge30Se70 glass sample is about 11.8 J/(molK) below the glass transition temperature. The infrared transmittance is about 60% indicating that the infrared performance is good. The glass reduced temperature Trg of Ge30Se70 sample is between 0.5~0.667, and the nucleation rate is very low, which indicates that the glass forming ability of Ge30Se70 glass is good.
Fund: Supported by National Basic Research Program of China (No.2013CB632904), National Natural Science Foundation of China (Nos.51371133, 51171136, 51301125 and 51401156), Natural Science Foundation of Shaanxi Province (Nos.2012JM6010 and 2014- JM6225) and Key Laboratory Research Project of Shaanxi Provincial Education Department (No.13JS041)
Fig.1 XRD spectra of Ge30Se70 glass and crystall samples (Inset shows the morphology of Ge30Se70 glass sample)
Fig.2 Infrared transmission spectrum of Ge30Se70 chalcogenide glass sample
Note: Tp—crystallization peak temperature, Tx—crystallization onset temperature
Fig.3 DSC heat flow curves of the Ge30Se70 glass samples under different heating rates R (Tg—glass transition temperature)
Fig.4 Fitting curve for the Ge30Se70 glass with the VFT equation
Fig.5 DSC curves of the empty crucible, sapphire and Ge30Se70 samples (Ti —onset temperature of the non-isothermal section, Ti+1—end temperature of the non-isothermal section)
R / (Ks-1)
Tg / K
Tx / K
Tp / K
0.083
587
681
691
0.167
590
691
707
0.333
593
701
722
0.667
603
712
746
Table 1 Characteristic temperature of Ge30Se70 samples under different R
Fig.6 Rising up isothermal baseline correction for determination of specific heat capacity (φi''—area of crucible when the temperature is between Ti and Ti+1, φi'—area of sapphire when the temperature is between Ti and Ti+1)
Fig.7 Specific heat capacity as a function of temperature
[1]
Wei W H.PhD Dissertation, Chongqing University, 2014
[1]
(魏文猴. 重庆大学博士学位论文, 2014)
[2]
Song B A, Dai S X, Xu T F, Nie Q H, Shen X, Wang X S, Lin C G.Acta Phys Sin, 2011; 60: 084217-1
