Reversible Photochromic Properties of Ti2O3(H2O)2(C2O4) . H2O Material

Potassium titanyl oxalate is used as the titanium source and HCl as growth promoter. Ti2O3(H2O)(2)(C2O4) . H2O, with hexagonal prism and spherical polyhedral morphology, has been synthesized by one-step hydrothermal method at 120 degrees C for 6 similar to 12 h, and the particle size range is 8-12 mu m. Ti2O3(H2O)(2)(C2O4) . H2O prepared in this research has excellent reversible photochromic properties. It is a kind of P-type photochromic compound, which is achromatic or colorless. The equilibrium time of discoloration or fading is 30 min. The photochromic mechanism research shows that the photochromic properties of Ti2O3(H2O)(2)(C2O4) . H2O are caused by the continuous reaction of Ti4+, Ti3+ with e(cb)(-), V-O(++) in unsaturated cationic compounds.

Automated summary

Potassium titanyl oxalate and HCl were used to synthesize Ti2O3(H2O)(2)(C2O4) · H2O with excellent reversible photochromic properties, showing achromatic or colorless characteristics as a P-type photochromic compound. The discoloration or fading equilibrium time is 30 minutes. The photochromic properties are attributed to the continuous reaction of Ti4+, Ti3+, e(cb)(-), V-O(++) in unsaturated cationic compounds.