Boron substitution in diopside evaluated through 11B nuclear reaction analysis |
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| Authors: | U. Hålenius P. Kristiansson H. Skogby |
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| Affiliation: | (1) Department of Mineralogy, Swedish Museum of Natural History, Box 50007, 104 05 Stockholm, Sweden Fax: +46-851954031 e-mail: ulf.halenius@nrm.se, SE;(2) Department of Nuclear Physics, Lund Institute of Technology, Box 118, 221 00 Lund, Sweden, SE |
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| Abstract: | ![]()
Nuclear reaction analyses on boron in flux-grown Me3+- and Na+-doped diopside crystals utilising the 11B(p,2α)4He reaction in conjunction with EMP analyses for major elements and optical absorption spectroscopy for determination of Me-valence state distributions show that appreciable amounts of B may enter the diopside lattice in crystals produced in Na2B4O7 fluxes. The results indicate that the substitution [6]Me3+[4]B3+[6]Mg2+ −1 [4]Si4+ −1 operates in the present diopside samples in addition to the coupled substitution [6]Me3+[8]Na+[6]Mg2+ −1 [8]Ca2+ −1. The specific NRA technique applied allows for quantitative, high resolution (ca. 5 μm) B analyses at ppm level as well as high-resolution and high-contrast imaging of B-concentration patterns in minerals. The estimated detection limit and relative error of the B analyses are 10 ppm and 5–10%, respectively. Received: 20 September 1999 / Accepted: 6 June 2000 |
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| Keywords: | Boron NRA Diopside Manganese Titanium |
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