The electrochromic behavior of amorphous films prepared by electron‐beam deposition has been studied. SIMS analysis has revealed that lithium accumulates in amorphous films during reversible coloring and bleaching in propylene carbonate solution of . When a large quantity of lithium has been injected into films, an absorption spectrum different from tungsten bronze is observed. In these films, lithium tungstate has been observed using x‐ray photoelectron spectroscopy and x‐ray diffraction analysis. It has been concluded that the degradation of electrochromism of amorphous is caused by the formation of stable lithium tungstate.
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Hashimoto et al. (1990) studied this question.