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Phase Transitions and Transient Liquid‐Phase Sintering in Calcium‐Substituted Lanthanum Chromite
Author(s) -
Chick Larry A.,
Liu Jun,
Stevenson Jeffry W.,
Armstrong Timothy R.,
McCready David E.,
Maupin Gary D.,
Coffey Gregory W.,
Coyle Chris A.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03095.x
Subject(s) - sintering , chromite , materials science , phase (matter) , lanthanum , metastability , solubility , oxide , phase transition , metallurgy , chemical engineering , analytical chemistry (journal) , mineralogy , inorganic chemistry , chemistry , thermodynamics , chromatography , physics , organic chemistry , engineering
This paper investigates sintering and phase transitions of La 0.7 CaxCrO 3 (0.25≥x≥0.35), a material useful as electrical interconnections in solid oxide fuel cells. Heating of the quenched, metastable single‐phase chromite resulted in exsolution of CaCrO 4 due to Ca solubility limitations below 1200°C. A transient liquid phase formed between 850° and 1000°C as the CaCrO 4 melted, causing partial densification in materials having 0.25 < x < 0.30. A slight increase in Ca content induced an additional liquid‐phase sintering event, likely due to melting of Ca 3 (CrO 4 ) 2 , which facilitated near‐complete densification by 1250°C. After enhancing sintering, the secondary phases redissolved into the chromite.