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Photochromic behavior of Li-doped MoO 3 sol–gels prepared by the peroxo sol–gel method was studied in details using various experimental techniques, including UV–vis, XRD, Raman, EPR, and XPS. The lithium doping has drastically enhanced the stability of the MoO 3 sol–gels. Upon UV-light irradiation from a high-pressure mercury lamp, the Li-doped MoO 3 sol turned from yellowish...
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