Low-Temperature Synthesis and Properties of LaMnO3±dand La0.67R0.33MnO3±d(R = Ca, Sr, Ba) from Citrate Precursors

Autor:	Patrizia Ferro, Antonio Ciccarone, Francesca Licci, Giuseppe Turilli
Rok vydání:	2003
Předmět:	Thermogravimetry Magnetization Thermogravimetric analysis Differential scanning calorimetry Valence (chemistry) Chemistry Inorganic chemistry Materials Chemistry Ceramics and Composites Analytical chemistry Curie temperature Magnetic susceptibility Stoichiometry
Zdroj:	Journal of the American Ceramic Society. 86:413-419
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.2003.tb03314.x
Popis:	LaMn1−y3+Mny4+O3±d and La0.67R0.33Mn1−y3+Mny4+O3±d (R = Ca, Sr, Ba) phases were synthesized at 350°C by using very reactive, amorphous precursors obtained from the stoichiometric citrate solutions. The chemical process was optimized with respect to the solution concentration, pH, and additives. The precursor reactions were investigated as a function of the cation stoichiometry and the additive by simultaneous thermal and thermogravimetric analysis and X-ray diffraction. The reaction pathway was found to be independent of the cation stoichiometry, but related to the acid or base additive. The annealing temperature was systematically increased in the 350–1200°C interval and the La0.67Sr0.33MnO3±d properties (i.e., crystal sizes, Mn average valence, Curie temperature, magnetization, magnetic susceptibility) were measured and found to vary consistently as a function of it.
Databáze:	OpenAIRE
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