The compressibility of wurtzitic boron nitride (wBN) taken in mixture with cubic BN has been measured at room temperature up to 66 GPa, using a diamond anvil cell and powder diffraction of synchrotron radiation. From the obtained pressure-volume relation for wBN the isothermal bulk modulus of B0=375±9 GPa and its first pressure derivative of dB0/dp=4.9±0.7 have been calculated indicating that this phase has nearly the same compressibility as cBN (B0=377±4 GPa and dB0/dp=4.1±0.2). Thermodynamic calculations using our findings on wBN equation of state have shown that wurtzitic boron nitride is metastable over the whole ranges of pressures and temperatures.
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Solozhenko et al. (1998) studied this question.
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