Title: YAG wet-chemical synthesis from chlorides and nitrates precursors: effect on phase evolution and powder sinterability

Authors: Paola Palmero, Serena Di Nunzio, Laura Montanaro

Addresses: R.U. INSTM – PoliTO, LINCE Lab., Department of Materials Science and Chemical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24 – 10129 Torino, Italy. ' R.U. INSTM – PoliTO, LINCE Lab., Department of Materials Science and Chemical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24 – 10129 Torino, Italy. ' R.U. INSTM – PoliTO, LINCE Lab., Department of Materials Science and Chemical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24 – 10129 Torino, Italy

Abstract: The influence of inorganic precursors on phase evolution and powder sinterability of YAG has been investigated. YAG powders were synthesised by reverse-strike precipitation, from yttrium and aluminium chlorides or nitrates aqueous solution. The powders were characterised by thermal analysis and XRD measurements. Pure-YAG was obtained after calcination at high temperature from both precursors, but the chlorides-derived materials yield mixtures of YAG and metastable YAlO₃ phases from 800°C to 1100°C. On the contrary, nitrates precursors led to the nucleation of pure-YAG at very low temperatures (from 500°C), thus allowing to directly produce well crystallised YAG powders, suitable for enhanced sintered products.

Keywords: YAG powders; wet chemical co-precipitation; precursors; phase evolution; powder sinterability; microstructure; chlorides; nitrates; sintering.

DOI: 10.1504/IJMPT.2009.025688

International Journal of Materials and Product Technology, 2009 Vol.35 No.3/4, pp.374 - 391

Published online: 23 May 2009 *

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