Synthesis and characterization of lead iron tungstate ceramics obtained by two preparation methods

Journal Article · Tue Nov 01 00:00:00 EST 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90189-9· OSTI ID:6953441

Zhou, L; Vilarinho, P M; Baptista, J L ^[1]

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1. Univ. de Aveiro (Portugal). Dept. de Engenharia Ceramica e do Vidro

Lead iron tungstate (Pb(Fe[sub 2/3]W[sub 1/3])O[sub 3]) is difficult to sinter as a single phase perovskite ceramic. Side reactions lead to undesirable second phases damaging the dielectric properties of the sintered material. Understanding these reaction routes is necessary to eliminate them and to improve on the properties of these ceramics. Lead iron tungstate ceramics were sintered from powders prepared by reaction of mixtures of the three oxides, or by reaction of prereacted iron oxide and tungsten oxide with lead oxide, in an attempt to control the formation of the perovskite phase. The reaction sequences, different in both cases, lead to a higher yield of the perovskite phase when the prereacted powders were used, avoiding therefore the presence of undesirable phases. The microstructures and dielectric properties of the sintered ceramics obtained by both methodologies are reported and compared. The prereacted intermediate phase method leads to a more ordered perovskite structure with better dielectric characteristics.

• OSTI ID: 6953441
• Journal Information: Materials Research Bulletin; (United States), Vol. 29:11; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON TUNGSTATES
DIELECTRIC PROPERTIES
MICROSTRUCTURE
SINTERING
LEAD TUNGSTATES
FERROELECTRIC MATERIALS
IRON OXIDES
LEAD OXIDES
PHASE STUDIES
TUNGSTEN OXIDES
CHALCOGENIDES
ELECTRICAL PROPERTIES
FABRICATION
IRON COMPOUNDS
LEAD COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties