A study on nucleation, crystallization kinetics, microstructure and mechanical properties of Ru–Bi partial substituted BSCCO glass ceramics

Abstract

This study deals with the effects of Ru-Bi partial substitutions on the thermal, structural and mechanical properties of Bi 1.8-x Ru x Pb 0.2 Sr 2 CaCu 2 O 10?d (x = 0.0, 0.025, 0.050, 0.075) system, produced by using glass ceramics method. The effects of Ru-Bi partial substitutions on glass transition, nucleation and crystallization temperature were analyzed via differential thermal analyzer (DTA). Besides, microstructure and micromechanical properties of Ru-Bi partially substituted BSCCO glass ceramics were also investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Vickers microhardness measurements. From the DTA results, nucleation kinetics were studied by using Ozawa, AugisBennett, Takhor and Kissinger equations. In addition to this, activation energies and Avrami parameters were also calculated. According to the results of the thermogravimetric analyses, the amount of oxidation was seen to be increased with increasing Ru concentration. Moreover, the lattice parameters, volume fractions and surface morphologies of our newly produced glass ceramics were investigated by XRD and SEM measurements, respectively. RISE behavior obtained from the microhardness measurements for all samples. Microhardness, elastic modulus, yield strength and fracture toughness values decreased with increasing Ru doping.

Superconducting properties and non-isothermal crystallization kinetics of a Bi2Sr2CaCu2O8+δ (Bi2212) superconductor prepared by the Pechini sol–gel method

“…24 O. Ozturk et al studied the nucleation and crystallization kinetics of the BSCCO glass-ceramic material, where Bi was partially replaced by Ru. 25 BSCCO superconductors in these studies were prepared by the solid-state reaction and melt quenching methods, which have the disadvantages of a long time, high temperature and high energy consumption. By contrast, BSCCO superconductors with ne crystallization can be obtained using the sol-gel method at lower temperatures and shorter times due to the high chemical activity, dispersion distribution, short diffusion distance and easy phase formation of precursors.…”

Crystallization Kinetics and Heat Treatment Temperature on Microstructure of Na₂O-CaO-P₂O₅-TiO₂ Glass System

“…This implies that energy needed for nucleation is provided at higher temperatures. [14]. Only one exothermic peak was observed in all glass samples.…”

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

“…Elde edilen sonuçların literatür ile uyumlu olduğu görülmüştür [23,24]. Elde edilen değerler daha önce yapılan çalışmalar ile karşılaştırıldığında; katkısız örneklerdeki aktivasyon enerjilerinin en yüksek olduğu, PbSe ve PbO+Se katkılama çalışmalarında aktivasyon enerjilerin katkı arttıkça azaldığı [26,27] ve RuPb katkılama çalışmasında ise ilk katkıyla birlikte katkısız örneğe göre azaldığı, ancak katkı arttıkça artmaya başladığı [28] görülmektedir. Buradaki çalışmalarda da, görülüyor ki katkılı örnekler katkısız örneklere göre daha katkıya göre daha kararsız yapıda olabilir.…”