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. 2015 Jan 22;5:7875. doi: 10.1038/srep07875

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(a) revised results from this study; (b) results from previous study⁵. Note that that each colour represents distinct Cs's valence state in the given compounds (grey: Cs⁺; green: Cs²⁺; blue: Cs³⁺; red: Cs⁵⁺), while the gradient colour indicate mixed valence states in between. The I4/mmm-CsF₂ structure in (a) and (b) are very different. The only common phase between (a) and (b) is Fddd-CsF₅.