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- W62397608 abstract "Highly reactive coal pyrites and unstable museum specimens are easily distinguished from the stable pyrites by the growth of white crystals that cover samples exposed to room atmosphere for short periods of time. Continued exposure to the atmosphere will eventually cause the specimens to fall apart. The term rotten pyrite has been applied to museum specimens that fall apart in this way. SEM studies show that reactive (rotten) pyrites contain between 100 and 10,000 times more dislocations than stable pyrites. Shock-loading of a stable pyrite to 7.5 GPa and 17 GPa increased its reactivity by a factor of two, probably caused by an increase in the number of imperfections. However, shock-loading at 22 GPa decreased the reactivity of pyrite because the imperfections produced at the higher pressure were removed during annealing the sample received at the higher temperature. Although there was a factor of six difference between the most and least reactive shocked MCB (commercial pyrite) samples, shock-loading did not increase the reactivity of the MCB pyrite to that of the Queensland coal pyrite. The results in hand show that while shock-loading produces sufficient imperfections to increase the reactivity of pyrites, there is insufficient data to show that imperfections aremore » the main reason why some coal pyrites are highly reactive. 9 refs., 1 fig., 1 tab.« less" @default.
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- W62397608 date "1991-01-01" @default.
- W62397608 modified "2023-09-24" @default.
- W62397608 title "REACTIVITY OF PYRITES AND DISLOCATION DENSITY" @default.
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- W62397608 doi "https://doi.org/10.1016/b978-0-7506-0387-4.50224-2" @default.
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