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We studied four tourmalines with different Fe contents from Xinjiang,Sichuan,and Yunnan provinces of China using M ssbauer spectroscopy and single crystal X-ray diffraction.The valence and location of Fe in the four tourmalines and two heat-treated tourmalines have been investigated.The experimental results showed that Fe in the four tourmalines at room temperature had two valence states and two locations,i.e.Fe2+(Y),Fe2+(Z),Fe3+(Y).After being heated at 850℃ for 48 and 72 h,Fe elements in tourmaline were nearly completely oxidized and mainly occupied Y sites,and a small amount of Fe3+ shifted to Z sites.Simultaneously,the amount of mixed valence state Fe 2.5+ progressively increased with heating time,and electron delocalization occurred between the adjacent sites [Fe2+-Fe3+].
We studied four tourmalines with different Fe contents from Xinjiang, Sichuan, and Yunnan provinces of China using M ssbauer spectroscopy and single crystal X-ray diffraction. The valence and location of Fe in the four tourmalines and two heat-treated tourmalines have been investigated. The experimental results showed that Fe in the four tourmalines at room temperature had two valence states and two locations, ie Fe2 + (Y), Fe2 + (Z), Fe3 + (Y). After being heated at 850 ° C for 48 and 72 h, Fe elements in tourmaline were nearly completely oxidized and mainly occupied Y sites, and a small amount of Fe3 + shifted to Z sites. Simultaneously, the amount of mixed valence state Fe 2.5+ progressively increased with heating time, and electron delocalization occurred between the adjacent sites [ Fe2 + -Fe3 +].