Low-temperature route to lead magnesium niobate

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb07651.x· OSTI ID:5178967

Chaput, F; Boilot, J P ^[1]; Lejeune, M ^[2]; Papiernik, R; Hubert-Pfalzgraf, L ^[3]

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1. Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, Ecole Polytechnique, 91128 Palaiseau Cedex (FR)
2. Ecole Nationale Superieure de Ceramique Industrielle, 87065 Limoges Cedex (FR)
3. Laboratoire de Chimie Moleculaire, Universite de Nice, Parc Valrose, 06034 Nice Cedex (FR)

Lead magnesium niobate, Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ (PMN), was prepared by a sol-gel technique using alkoxide precursors. The hydrolysis-condensation mechanism leads to a translucent gel which is dried under hypercritical conditions to avoid collapse of the porous texture. After drying, the aerogel exhibits a B-deficient pyrochlore structure which progressively inserts magnesium oxide when the temperature increases. Near 700{sup 0}C, this pyrochlore phase completely transforms into the PMN-perovskite phase. Above 1000{sup 0}C, the loss of lead oxide leads to the destabilization of the PMN-perovskite with formation of an A-deficient pyrochlore phase.

• OSTI ID: 5178967
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:8; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
LEAD COMPOUNDS
LEAD OXIDES
LOW TEMPERATURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSTRUCTURE
MINERALS
NIOBATES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE STUDIES
PRECURSOR
PYROCHLORE
REFRACTORY METAL COMPOUNDS
SOL-GEL PROCESS
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS