【摘要】 本文运用玻璃中铬的顺磁共振与吸收光谱研究了R₂O-Al₂O₃-B₂O₃玻璃中R₂O的种类和含量对铬的价态及玻璃结构的影响。发现随着R₂O含量的增加铬由Cr³⁺经Cr⁵⁺向Cr⁶⁺转化,并在一定的玻璃成分范围内可同时存在Cr³⁺、Cr⁵⁺和Cr⁶⁺三种价态。由Cr³⁺的顺磁信号及光谱参数随R₂O含量的变化很小,可以推断Cr³⁺并非均匀地分布于整个玻璃体内,而是基本上集中在铝氧四面体的周围。更多还原

【Abstract】 Influence of the type and content of R₂O in R₂O-Al₂O₃-B₂O₃ glasses on the state of valence of Cr as well as glass structure has been studied by means of ESR and optical absorption spectrum of Cr.It is found that with the increase of R₂O content the chemical valence of cr changes from Cr³⁺ through Cr₅₊ to Cr₆₊ and in certain extent of glass composition, the three states of Cr₃₊, Cr₅₊, and Cr⁶⁺ can exist simultaneously. Owing to the small variation of ESR and the parameters of optical absorption spectrum of Cr³⁺ with R₂O content, it is deduced that Cr³⁺ ions do not distribute uniformly in the whole glass, but concentrate in the vicinity of the tetrahedron of alumino-oxygen fundamentally.更多还原