Phase transition, crystal water and low thermal expansion behavior of Al2−2x(ZrMg)xW3O12·n(H2O)

(a and b) Temperature dependent Raman spectra of Al2−x(ZrMg)xW3O12 (x=0.1, 0.2), (c and d) Building block of a unit cell of Al2−x(ZrMg)xW3O12·n(H2O) and schematic showing the effect of crystal water on Al(Zr, Mg)-O-W linkages.