Nanometric modulation in apatite |
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| Authors: | C Ferraris T J White J Plévert R Wegner |
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| Institution: | 1. School of Materials Science and Engineering, Nanyang Technological University, N4.1-01-30, Nanyang Avenue, 639798, Singapore, Singapore
2. Departamento de Miner??o e Geologia, Campus II UFPb, CP 10094 58.109-970, Campina Grande Pb, Brazil
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| Abstract: | Brazilian gem-grade apatite (B-Ap) consists of contiguous fluorine-enriched (host-Ap) domains (∼400 nm), interspersed by isolated domains (∼200 nm) of a chlorine-enriched (guest-Ap) apatite in a long period compositional modulation. Within each of these domains a third modulation differentiating Si- and
S-rich nanocrystals (5–10 nm) of ellestadite (El-Ap), a monoclinic apatite variety, developed possibly during a short term high temperature event. These unexpected miscibility
gaps may be useful geothermometric tools, and could prove decisive for enhancing the properties of apatites used as heterogeneous
catalysts and fuel–cell electrolytes. |
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| Keywords: | Apatite HRTEM Exsolution Miscibility gap |
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