Preparation of YBa2Cu3O7−x superconductor by coprecipitation of nanosize oxalate precursor powder in microemulsions

Synthesis and optical characterizations of undoped and rare-earth-doped CaF2 nanoparticles

“…Following Kumar et al [19], Bender et al [20] used the reverse micelles system to synthesize BaF 2 nanoparticles. We adapted this method for the synthesis of undoped and RE-doped CaF 2 nanoparticles.…”

Preparation, Processing, and Characterization of Nano‐Crystalline BaTiO3 Powders and Ceramics Derived from Microemulsion‐Mediated Synthesis

“…5 Much finer powders can be prepared via the alkoxide method, 6,7 being based on the hydrolytic decomposition of mixed metal alkoxide precursor solutions. Meanwhile, a large variety of electroceramic compounds, including piezoelectrics, 18 varistors, 19,20 superconducting oxides, [21][22][23] and magnetics, [24][25][26][27] has been synthesized in the form of nano-powders via microemulsion-mediated synthesis. One possibility to control these elementary processes during the hydrolysis reaction is the utilization of water-in-oil (w/o) microemulsions as reaction media.…”

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

“…These include in situ synthesis of nanoparticles of AgC1 [881 and AgBr [57]; and microemulsion mediated synthesis of highly dense and microhomogeneous Y-Ba-Cu-O (123) and B-Pb-Sr-Ca-Cu-O (2223) high temperature ceramic superconductors [89][90][91], high coercivity barium ferrite for high-density perpendicular recording [92,93], superparamagnetic y-Fe203 nanoparticles [941 and zinc oxide based varistors [95]. The synthesis of these materials and their structure and properties are described in the following sections.…”

“…Based on these results we can say that the microemulsion derived 123 superconductor is seven times better than the one formed by bulk co-precipitation, on the basis of the Meissner shielding results for the two samples. YBa2Cu3OT_ x superconductors have also been synthesized using water-in-oil microemulsions based on a nonionic surfactant Igepal CO 430 (nonylphenoxypoly (ethyleneoxy) ethanol) with cyclohexane as the oil phase [90]. In this process, the aqueous phase in one microemulsion consisted of yttrium acetate, barium carbonate and copper acetate, in a cationic ratio of 1:2:3 (based on 10 mM of Y 3÷) dissolved in a 50/50 (v/v) acetic acid/water mixture.…”