Fig xA a X ray diffraction
The results between RT–250 °C show a fast weight loss that can be attributed to desorption of adsorbed water and other gasses . In the 250–300 °C the weight is almost constant. The weight loss above 300 °C is primary due to the oxygen loss from the LSFCu structure and the formation of oxygen vacancies. This increment of the oxygen vacancies in the structure above 300 °C may be the cause of the phase transition that we reported at 425 °C.