I have synthesized barium titanate via co-precipitation method. optimum amount of BaCl2 (Sigma-Aldrich 99.99%), Titanium (IV) Chloride (Sigma-Aldrich 99.99%) and Oxalic acid are liquefied in diH2O, that are homogeneously stirred magnetically. After precipitate formation, the solution is heated to 80°C on a hotplate. The final particles are collected and crushed in a motor-pistol to obtain white BTO powder. XRD results showed triclinic (BaTiO3) matching JCPDS no. 40-0405. We know that generally by literature Barium Titanate shows tetragonal structure.Why and How we have Obtained this triclinic Structure?
You can try Rietveld Refinement using the tetragonal and orthorhombic models to clear your doubt.
If this triclinic structure is non-centrosymmetric, then it will be very good for dielectric and ferroelectric properties.
As you heat the sample at a maximum of 80 ℃, that's why most probably this triclinic structure obtained.
If you anneal the sample at a further higher temperature, then there would have a possibility to have a comparatively better stable phase. In that case, you may obtain the tetragonal phase.
Rietveld Refinement and XRD analysis of your new sample will solve your problem definitely,
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