Ontology type: schema:ScholarlyArticle Open Access: True
2014-07
AUTHORSO. O. Kurakevych, V. L. Solozhenko
ABSTRACTThe p-V-T equation of state of superhard boron suboxide B6O has been measured up to 6 GPa and 2700 K using multianvil technique and synchrotron X-ray diffraction. To fit the experimental data, the theoretical p-V-T equation of state has been derived in approximation of the constant value of the Anderson-Grüneisen parameter δT. Bulk modulus B0 =181 GPa and its first pressure derivative B0′ = 6 at 300 K; two parameters describing thermal expansion at 0.1 MPa, i.e., a = 1.4 × 10−5 K−1 and b = 5 × 10−9 K−2 as well as δT = 6 have been included in the model. The good agreement between fitted and experimental isobars has been achieved to the absolute volume changes up to 5% as compared to the volume at standard conditions, V0. The fitted thermal expansion at 0.1 MPa well consistent with the experimental data as well as with ambient-pressure heat capacity cp, bulk modulus B0 and δT describing its evolution with volume and temperature have been discussed. The fitted value of Grüneisen parameter γ = 0.85 in agreement with previous empiric estimations for B6O and experimental values for other boron-rich solids has been reported. More... »
PAGES270-278
http://scigraph.springernature.com/pub.10.3103/s1063457614040054
DOIhttp://dx.doi.org/10.3103/s1063457614040054
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