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- W286025850 abstract "In situ high-temperature synchrotron radiation powder diffraction patterns were taken from room temperature to T = 740� C from synthetic feldspars along the join CaAl2Si2O8-SrAl2Si2O8(An-SrF). Three samples of composition An95SrF5 ,A n 90SrF10 and An85SrF15 were investigated, and the evolution of cell parameters with T was determined by Rietveld analysis of powder X-ray diffraction patterns. The high-temper- ature PItransition, previously observed with Tc = 241� C in anorthite, was found in An95SrF5, An90SrF10 and An85SrF15 feldspars at Tc = 233(5)� , 195(2)� and 174(2)� C respectively. The transition was revealed by the disappearance of critical reflections and variations in the rate of change of cell parameters with temperature. A significant, although small (between 0.0025 and 0.0012 at room temperature), spontaneous strain could be measured, allowing the thermodynamic behaviour of the transition to be modelled. A second- order trend for An90SrF10 and An85SrF15 (b = 0.504(7) and 0.505(7) respectively) or nearly second-order for An95SrF5(b = 0.458(4)) was observed in contrast with tricritical behaviour of end member anorthite. An extrapolation of the Tc versus composition to room temperature indicates that the critical composition for the Pis An60SrF40." @default.
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- W286025850 date "2005-01-01" @default.
- W286025850 modified "2023-09-27" @default.
- W286025850 title "Thermodynamic behaviour of the high-temperature PIphase transition along the CaAl 2 Si 2 O 8 -SrAl 2 Si 2 O 8 join" @default.
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