Study of crystallization processes in Bi-doped As2S3 chalcogenide glasses using linear isoconversion and isokinetic methods

• Published in: Journal of crystal growth Vol. 457; pp. 6 - 10
• Main Authors: Šiljegović, M.V., Lukić-Petrović, S.R., Petrović, D.M., Štrbac, G.R., Videnović, I.R.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2017
• Subjects: A1. Solid solutions; B1. Glasses; B2. Semiconducting materials; Nucleation; X-ray diffraction; B1. Glasses; X-ray diffraction; A1. Solid solutions; Nucleation; B2. Semiconducting materials
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2016.08.007

A kinetic analysis of the crystallization processes in Bi-doped chalcogenide glasses was performed using the differential scanning calorimetry method. According to the results of X-ray diffraction measurements of the annealed samples, it was revealed that the crystallization process in the compound with 3at% Bi takes part through the formation of Bi2S3 crystallization centers, while in the sample with 5at% Bi, in addition to the appearance of Bi2S3, the centers of elemental As also occurred. These conclusions are in agreement with the results of thermogravimetric measurements. The crystallization activation energy (Ea), determined using Kissinger, Akahira and Sunose (KAS) method, was almost twice higher in the sample with the higher Bi content. This increase with Bi addition was associated with the significant modifications of the amorphous matrix structure. Using the methods of Gao-Wang and Šatava, it was found that the crystallization in the composition with 3at% Bi, as well as the first crystallization process in the sample with 5at% Bi takes place as a voluminous, three-dimensional process. The second crystallization process in the sample with 5at% Bi is characterized with a two-dimensional, surface reaction mechanism, switching in the final stage into one-dimensional mechanism.
•Crystallization in Bi3(As2S3)97 takes part as a voluminous, three-dimensional process.•Crystallization in Bi5(As2S3)95 is complex process taking part first as voluminous.•The second crystallization in Bi5(As2S3)95 is characterized with a surface mechanism.•Increase of crystallization activation energy is a result of changes in structure.