Abstract
Enlargement of the lattice parameters, particularly the ¿-dimension, of titanites synthesized at high temperatures (≥700°C) in the system CaO-TiO2-SiO2(±H20), can be accounted for by substitution of Ti for Si. The unit-cell dimensions of the ideal end-member, CaTiSiO5, extrapolated from the linear relationship between tetrahedral site occupancies and unit-cell dimensions of synthetic samples are approximately; a = 7.054Å, b = 8.703Å, c = 6.551Å and β = 113.77°. Enlargement of the b dimension to 8.724Å corresponds to the presence of Ti in approximately 6% of the tetrahedral sites.
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