Abstract
New in-situ high-temperature X-ray powder diffraction data on the normal-incommensurate phase transition in Co-akermanite (Ca2CoSi2O7) are presented. Evidence for the phase transition is found in the abrupt change in the thermal expansivity of the c lattice parameter at 220° C. In addition, the c lattice parameter exhibits premonitory effects of the phase transition through the leveling out of the thermal expansivity at temperatures from 87 to 220° C.
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