Phase relations in the system Ce[sub 2]O[sub 3]-Ce[sub 2]Si[sub 2]O[sub 7] in the temperature range 1,150 to 1,970 C in reducing and inert atmospheres

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04530.x· OSTI ID:6870653

Tas, A C ^[1]; Akinc, M ^[2]

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1. Middle East Technical Univ., Ankara (Turkey). Dept. of Metallurgical Engineering
2. Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering

The high-temperature phase relations in the system Ce[sub 2]O[sub 3]-Ce[sub 2]Si[sub 2]O[sub 7] have been studied in the temperature range 1,150--1,970 C in inert and reducing atmospheres by conventional quenching and differential thermal analysis. Three eutectic reactions were found to occur at 1664 C and 27 mol% SiO[sub 2] between Ce[sub 2]O[sub 3] and Ce[sub 2]SiO[sub 5], at 1870 C and 54 mol% SiO[sub 2] between Ce[sub 2]SiO[sub 5] and Ce[sub 4.67](SiO[sub 4])[sub 3]O, and at 1762 C and 65 mol% SiO[sub 2] between Ce[sub 4.67](SiO[sub 4])[sub 3]O and Ce[sub 2]Si[sub 2]O[sub 7]. Microstructural characteristics of the eutectic reaction were observed. Cerium pyrosilicate exhibits a polymorphic transformation at 1,274 C. The binary compounds of this system were all found to melt congruently. The enthalpy and entropy of melting of these binary compounds were calculated from the initial slopes of their experimentally determined liquidus lines.

• OSTI ID: 6870653
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CERIUM COMPOUNDS
CERIUM OXIDES
CERIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
DIAGRAMS
ENTHALPY
ENTROPY
EUTECTICS
MATERIALS
MELTING POINTS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
STABILITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE