I dont think this is a composite material. However, send the raw file to extract the xrd data.
Dear Vaishali,
I hope I've got your question: referring to the paper you've attached, the cubic structure of rare-earth doped SrTiO3 is related to red peaks in figure 2 and 3. In particular, according to the authors, a stable cubic phase of the correctly doped SrTiO3 can be obtained in a particular range of operating parameters. Infact, the authors have obtained the pure cubic phase only by using 1100 °C as calcination temperature and 1350 °C as sintering temperature. In fact, as you can read in the final part of the paper, by sintering their material at 1500 °C, some unidentified peaks (related to structures different from the cubic one) appeared.
Let me know if I've been useful to you.
Luca
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