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The framework flexibility of the nanosized rhombohedrally distorted titanosilicate analog of the mineral pharmacosiderite (RTS) has been in situ studied by powder X-ray diffraction at elevated temperatures. Between 30 and 175°C the rhombohedral lattice showed tendency to shrink and open the angle of the axes. At 125°C the cell distortion resulted in pseudo cubic cell metrics where the reflections...
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