NDLI: Wet chemical syntheses of ultrafine multicomponent ceramic powders through gel to crystallite conversion

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Book reviews ( Journal of Materials Chemistry Vol - 4 Issue - 12 )

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Wet chemical syntheses of ultrafine multicomponent ceramic powders through gel to crystallite conversion

Content Provider	Royal Society of Chemistry (RSC)
Author	Kutty, T. R. Narayanan Padmini, P.
Copyright Year	1994
Abstract	Coarse Bn+On/2·xH2O (10 < x < 120) gels, free of anionic contaminants react with A(OH)2 solutions under refluxing conditions at 70–100 °C giving rise to nanoparticles of multicomponent oxides (A = Ba, Sr, Ca, Mg or Pb; B = Zr, Ti, Sn, Fe, Al or Cr). These include ABO3 perovskites and their solid solutions, polytitanates, hexaferrites and related phases, aluminates with spinel or tridymite structure and chromates. The nanosized crystallites are often in metastable phases, such as cubic BaTiO3 at room temperature or superparamagnetic hexaferrites. Through the same route, luminescent phosphors of aluminates doped with rare-earth metals could be prepared. The present results indicate the general features of the gel–crystallite (G–C) conversion involving the instability of the metal hydroxide gel brought about by the disruption of the ionic pressure in the gel as a result of the faster diffusion of A2+ ions through the solvent cavities within the gel frame work. This is accompanied by the splitting of the bridging groups like B—(OH)—B or B—O—B, leading to the breakdown of the gel into crystallites. G–C conversion has advantages as a method of synthesis of ceramics in terms of operational cost and procedural simplicity.
Starting Page	1875
Ending Page	1881
Page Count	7
File Format	PDF
ISSN	09599428
Volume Number	4
Issue Number	12
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9940401875
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lead Zirconium Spinel Tridymite Metastability Barium titanate Superparamagnetism Rare earth element Hydroxide Diffusion Solvent
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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