Investigation of Thermal Properties of Bi1,8-xGaxPb0,2Sr2CaCu2Oy Glass Ceramics

Abstract

This article presents the variation in the thermal properties of Bi-Ga partial substitution in Bi1,8-xGaxPb0,2Sr2CaCu2Oy (BSCCO) glass ceramic structures. The experimental steps of BSCCO glass ceramic samples are specified. The samples were produced with Bi-Ga partial substitution at different ratio using the melt casting method. Thermal properties were analyzed using the differential thermal analysis (DTA) method. The mass gain in the samples was investigated by the thermogravimetric analysis (TGA) method.. Figure 1 Schematic representation of experimental processes of Bi1,8-xGaxPb0,2Sr2CaCu2Oy samplesPurpose: The aim is to examine the effect of Bi-Ga partial substitution on the thermal properties of the BSCCO glass ceramic structure.Theory and Methods: First, the heat treatment stage of the powder samples was specified. Then, the process of transforming the molten material into glass was performed (Figure 1). Finally, the effect of partial substitution ratio of Ga in the Bi1,8-xGaxPb0,2Sr2CaCu2Oy on thermal properties using DTA and TGA measurements. Results:In the DTA curves of all samples, it is seen that as the heating rate is increased, it shifts to the high temperature regions at the glass transition temperature and crystallization temperature. Avrami parameters were calculated for each sample using the crystallization peaks in the DTA curves. The Avrami parameters of samples were calculated as 3,45; 2,82; 2,25 and 2,58 for A, B, C and D respectively. Compared to the A, the activation energy of the B increased by 1-2 kJ/mol, but this energy level started to decrease as the substitution ratio increased. When the graphs are examined for all samples, it is seen that the crystallization rate increases with the increase in the substitution ratio. Conclusion:Since the required energy range for crystallization will be lower at low temperatures, there will be sufficient time for nucleation. However, as the higher heating rates are increased,

The Investigation of Bi-Ga Partial Replacement Effect on Magnetic, Mechanical and Microstructural Properties Bi(1,8-x)Pb0,2GaxSr2CaCu2Oy Superconductor

“…Bu çalışmada malzeme üretimi için eritme-döküm tekniği kullanılmıştır [18][19][20][21][22][23]. Bi-Ga kısmi yer değişiminin süperiletkenlik üzerindeki etkisinin belirlenebilmesi amacıyla, temel formülü Bi1,8 xPb0,2GaxSr2CaCu2Oy olacak şekilde, x=0; 0,3 ve 0,8 değerleri verilerek üretilen numuneler sırasıyla FGa0, FGa03, FGa08 olarak adlandırılmıştır.…”