| || Synthesis of Lithium-doped Zirconia Nanoceramics of Controlled Oxygen Vacancies
Author : Mohapatra, S.;Ram, S.
Source : Defence Science Journal ; Vol:57(1) ; 2007 ; pp 41-46
Subject : 66 Chemical Technology
Keywords : Stabilised zirconia;Ceramics;Nanoceramics;Microstructure;Synthesis;Cationic doping
Abstract : Doping of lithium (Li+) cations results in stabilised zirconia, especially in tetragonal (t) crystal structure, i.e., Li+: t-ZrO2. It is useful to vary oxygen vacancies in Li+: ZrO2 powders. The Li+: t-ZrO2 powder having 1-5 mol per cent Li+, are obtained by using a novel chemical method of a polymer precursor, which consists of Li+ and Zr4+ cations capping in polymer molecules of polyvinyl alcohol (PVA) and sucrose. The results are analysed in terms of XRD and microstructure of Li+: t-ZrO2 powders prepared under specific conditions of heating the precursor in air at elevated temperatures. The polymer precursor consists of fibrils of average 120 m length and 0.5–1.0 m dia. A refined Li+: t-ZrO2 powder (15-25 nm crystallite size) occurs after heating the precursor at 500–600 °C for 2h in air.