Corrected spacegroup for M<SUB>0.5</SUB>Ti<SUB>2</SUB>P<SUB>3</SUB>O<SUB>12</SUB> compounds

The space group of the low thermal expansion phosphates, belonging to NASICON structural family, having divalent cations has been reassigned as R3&#x033F; based on powder X-ray diffraction studies in the system M0.5Ti2P3O12. This implies further ordered distribution of M2+ cations and vacancies along the hexagonal 'c' direction of NASICON structure