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Chemistry for Sustainable Development

2013 year, number 6

Effect of Mechanical Activation on the Synthesis of Lead Ferroniobate

A. A. GUSEV1, I. P. RAEVSKY2, E. G. AVVAKUMOV1 and V. P. ISUPOV1
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
E-mail: gusev@solid.nsc.ru
2Research Institute of Physics, Southern Federal University,
Pr. Stachki 194, Rostov-na-Donu 344090 (Russia)
E-mail: igorraevsky@gmail.com
Keywords: lead ferroniobate, thermal synthesis from iron, niobium and lead oxides using mechanical activation
Pages: 569–575

Abstract

The synthesis of lead ferroniobate from lead, iron and niobium oxides taken in the stoichiometric ratio was investigated for the purpose of choosing the optimal compositions, conditions of mechanical activation and subsequent thermal treatment. The process was carried out in the presence of the excess of lead oxide to prevent the deviation from the stoichiometry of the ceramics obtained after sintering. The changes of the phase composition of mixtures during mechanical activation and subsequent thermal treatment were followed. It was demonstrated that the most attractive structure and properties are those characterizing lead niobate obtained with some excess of lead oxide over the stoichiometric composition. It was established that with the help of mechanical activation it is possible to vary within a broad range the temperature of the magnetic phase transition for the powders and ceramics of lead ferroniobate.