Abstract
The reaction between lanthanum oxide and strontium carbonate was studied non-isothermally between 350 and 1150
°C at different heating rates, intermediates and the final solid product were characterized by X-ray diffractometry (XRD). The reaction proceeds through formation of lanthanum oxycarbonate La
2O(CO
3)
2, lanthanum dioxycarbonate La
2O
2CO
3, and non-stoichiometric strontium lanthanum oxide La
2SrO
x
(
x
=
4
+
δ). La
4SrO
7 was found to be the final product which begins to form at ∼700
°C. Li
+ doping enhances the formation of the final product as well as commencement of the reactions at lower temperatures.