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p-V-T equation of state of superhard boron suboxide B6O has been measured upto 6 GPa and 2700 K using multianvil technique and synchrotron X-raydiffraction. To fit the experimental data, the theoretical p-V-T equation ofstate has been derived in approximation of the constant value of theAnderson-Gr\"uneisen parameter {\delta}T. The model includes bulk modulus B0=181 GPa and its first pressure derivative B0' = 6 at 300 K; two parametersdescribing thermal expansion at 0.1 MPa, i.e. a = 1.4x10-5 K-1 and b = 5x10-9K-2, as well as {\delta}T = 6. The good agreement between fitted andexperimental isobars has been achieved to the absolute volume changes up to 5%as compared to volume at standard conditions, V0. The fitted thermal expansionat 0.1 MPa is well consistent with the experimental data, as well as withambient-pressure heat capacity cp, bulk modulus B0 and {\delta}T describing itsevolution with volume and temperature. The fitted value of Gr\"uneisenparameter {\gamma} = 0.85 is in agreement with previous empiric estimations forB6O and experimental values for other boron-rich solids.

Thermoelastic Equation of State of Boron Suboxide B6O up to 6 GPa and 2700 K: Simplified Anderson-Gr\"uneisen Model and Thermodynamic Consistency