Journal Article

PUBDB-2015-05291

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermoelastic equation of state of boron suboxide $\mathrm{B_{6}O}$ up to 6 GPa and 2700 K: Simplified Anderson-Grüneisen model and thermodynamic consistency

Kurakevych, O.>Extern* ; Solozhenko, V. (Corresponding author)>Extern*

2014
Allerton Press New York, NY

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Please use a persistent id in citations: doi:10.3103/S1063457614040054

Abstract: The p-V-T equation of state of superhard boron suboxide $B_{6}O$ 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 $\delta$$_{T}$. Bulk modulus B$_{0}$ =181 GPa and its first pressure derivative $B_{0}$$^\prime$ = 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 $\delta$$_{T}$ = 6 have been included in the model. The good agreement between fitted and experimental isobars has been achieved to the absolute volume changes up to 5% as compared to the volume at standard conditions, V$_{0}$. The fitted thermal expansion at 0.1 MPa well consistent with the experimental data as well as with ambient-pressure heat capacity c$_{p}$ , bulk modulus B$_{0}$ and $\delta$$_{T}$ describing its evolution with volume and temperature have been discussed. The fitted value of Grüneisen parameter $\gamma$ = 0.85 in agreement with previous empiric estimations for $B_{6}O$ and experimental values for other boron-rich solids has been reported.

Note: (c) Allerton Press, Inc. the arxiv v1 version matches with the post referee version.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)
2. FS-Proposal: I-20080149 EC (I-20080149-EC) (I-20080149-EC)
3. FS-Proposal: I-20120445 EC (I-20120445-EC) (I-20120445-EC)
4. ELISA - European Light Sources Activities - Synchrotrons and Free Electron Lasers (226716) (226716)

Experiment(s):

1. DORIS Beamline F2.1 (DORIS III)
2. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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