Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..799w&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 6, p. 799-802
Physics
7
Physical Properties Of Rocks: Magnetic And Electrical Properties, Mineral Physics: Electrical Properties, Physical Properties Of Rocks: Transport Properties
Scientific paper
Dehydration and electrical conductivity (σ) experiments were performed on diopsides from India (In), Sri Lanka (Sri) and Russia (Ru) to study the effect of hydrogen (H) on σ. Dehydration showed that hydrogen concentrations (CH) of In- and Sri-diopsides remained constant (~50 and ~900 H/106Si), and CH in Ru-diopside decreased continuously from 1000 to 100H/106Si within 72 h. σ's were measured at T=1193-1473K, P=0.1MPa and fO2=10-9MPa. Different changes in σ with time were observed: the σ of Ru-diopside was reduced by one order of magnitude within 72 h as crystals dehydrated; σs of In- and Sri-diopsides remained time-independent. Sri-diopside shows the highest σ corresponding to its highest CH among the three crystals. Our results suggest an important effect of H on the σ of diopsides. We interpret this as a result from the fast diffusion of H incorporated into diopside. Also the concentration and mobility of intrinsic charged defects may increase due to the presence of H.
Dresen Georg
Ji Shaocheng
Wang Zichao
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