Comparison of conventional and non conventional methods of synthesis for the superconducting Ba-Pb-CaCu-O system

摘要

The methods for the synthesis of the superconducting systems are the well known usual and the unusual. Usual methods are the classical heating in furnace (oven) known as conventional methods for the ceramic samples. Special extra furnace techniques are used as firing profiles with different heating rates as for example, 5 degrees C/min, or N degrees C/min or cooling at any rate, too. The unusual methods or non conventional methods begin with: films with depositions of components [1), thin films technology [2], metallurgical route for synthesis [31, thin films deposited by sol-gel process on different substrates [4], sintering [5], spray deposition [6], films deposited by spray pyrolysis method [7], solid-state reaction [8], thin films by pulsed laser deposition [9], sol-gel process [10], composites obtained by in situ spray pyrolysis method [11] and et al. Classical mixture with the general chemical formula Ba(3-x)PbxCa2Cu3O8+d (x=0.2) according to the general Ba-Pb-Ca-Cu-O system, was prepared either with the classical conventional oven and with an microwave oven [12]. The comparison of the two methods shows that there are very interesting differences.