Effect of B substitution on thermal changes of UV-Vis and Raman spectra and color of Al2W3O12 powder

We investigated the influence of B substitution for Al2W3O12 on thermal changes of UV-Vis and Raman spectra, and colors. First, B-substituted Al2W3O12 powder was synthesized by a solid-state reaction method. Single-phase Al2-xBxW3O12 powders with x = 0, 0.10 and 0.20 were successively prepared. B substitution promoted thermal changes of the UV-Vis spectra, resulting in a more pronounced color change of Al2W3O12 in the range of 30-150 A degrees C. Raman spectra of the Al2-xBxW3O12 powders with x = 0 and 0.20 indicated that the lattice vibrations of Al2-xBxW3O12 with x = 0.20 were larger than those of Al2W3O12. The thermal change of the color phase (Delta E) in the range 30-150 A degrees C of Al2W3O12 was increased by B substitution. The color of the B-substituted Al2W3O12 powders changed reversibly from pale white at 30 A degrees C to light yellowish green at 150 A degrees C.