Study of relationships among synthesis, microstructure and mechanical properties of lithium aluminosilicate glass-ceramics containing ZnO and MgF2 by synchrotron XRD and XANES

摘要: The effect of MgF2 and ZnO as additives on the microstructure evolution a lithium aluminosilicate glass-ceramic is studied by X-ray powder diffraction absorption near edge structure. changes main, secondary phase development morphology under different additive concentrations are responsible for variation in flexural strength. decreased strength (>50 %) MgF2-bearing samples can be attributed to non-uniform microstructure, while increased ZnO-doped might due residual stress resulting from reduction viscosity. In addition, structural role Zn ions changed evolutions. For highly crystalline with commercial-like composition, tend have spinel-like local environments; simplified favor hexagonal ZnO-like surroundings. appearance significant multiple scattering peaks structure indicates usually presented an ordered environment high doping level (>1 % or MgF2).