The structure of the technologically important hydrogen storage compound NaBH4 has been investigated under pressures up to 30 GPa by in situ angle dispersive high pressure x-ray diffraction using synchrotron x rays and a diamond anvil cell. Our experimental results show pressure-induced structural transitions of α-NaBH4 (cubic - Fm3m) to β-NaBH4 (tetragonal - P421c) at 6.3 GPa and further to an orthorhombic phase (Pnma) at 8.9 GPa. The high pressure orthorhombic phase is found to be stable up to 30 GPa. The cubic phase is completely recovered on releasing the pressure back to ambient.
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Kumar et al. (2005) studied this question.
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