Thermal expansion and compressibility of alamosite (PbSiO3) determined by in-situ synchrotron X-ray diffraction

This manuscript presents an investigation of alamosite, PbSiO3, obtained by crystallization of lead metasilicate glass, PbO.SiO2. Rietveld refinement of synchrotron X-ray diffraction (SXRD) measurements as a function of temperature and pressure confirmed the stable crystalline structure of PbSiO3, with a monoclinic crystal system in the P12/n1 (13) space group. The samples were heated to 973 K at ambient pressure and compressed to 6 GPa at room-temperature. Furthermore, the in situ temperature-induced lattice expansion and pressure-induced lattice compression are reported, providing the thermal expansion coefficients, compressibility and bulk modulus, important parameters determining physical properties of glass-ceramic materials.