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１ 概述根据经典的定义，混合价化合物是指一类化合物，其中的同一种元素（通常是金属元素）存在着两种不同的价态。早在１９６０年代，Ｒｏｂｉｎ和Ｄａｙ［１］就注意到该类化合物独特的结构及光谱特性，并根据不同价态原子之间相互作用的强弱将混合价化合物分为三大类（表?
1 Overview According to the classical definition, mixed valence compounds refers to a class of compounds in which the same element (usually a metal element) exists in two different valence states. As early as the 1960s, Robin and Day [1] noticed the unique structural and spectral properties of these compounds and classified the mixed valence compounds into three categories according to the strength of the interaction between different valence atoms (Table 1).