PUMA
Istituto dei materiali per l'elettronica ed il magnetismo     
Artini C., Costa G., Carnasciali M., Masini R. Stability field and structural properties of intra-rare earth perovskites. In: Journal of Alloys and Compounds, vol. 494 (1-2) pp. 336 - 339. Elsevier, 2010.
 
 
Abstract
(English)
A stability study of perovskitic LaREO3 oxides (RE = Dy, Ho, Er, Tm, Yb, Lu) as a function of temperature was undertaken. A correlation between the Goldschmidt t value and the perovskitic stability field amplitude was found: the latter widens as t increases. Magnetic measurements, performed on all the perovskitic samples, showed that t is also related to the exchange interactions. LaREO3 oxides were synthesized by thermal decomposition of the corresponding coprecipitated oxalates at temperatures ranging between 600 and 1800 ◦C. Simultaneous differential thermal and thermogravimetric analyses showed that all the La-RE mixed oxalates decompose similarly. All the oxides, except LaDyO3, crystallize in the perovskitic form in a temperature range that depends on the ionic size difference between La and the smaller rare earth; above and below the perovskitic stability field, the B or C form, typical of rare earth sesquioxides, is present. Rietveld refinements, carried out on all the LaREO3 samples synthesized at 1200 ◦C, showed the occurrence of an orthorhombic distorted perovskitic structure belonging to the Pnma space group.
DOI: 10.1016/j.jallcom.2010.01.030
Subject 64.75.-g
61.05.cp
75.50.-y


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