The effect of pressure to several hundred kilobars has been measured on the compressibilities of NaI, LiF, and NaF. For NaI and LiF the semiclassical Born—Mayer—Huggins theory gives a good fit over the entire pressure range. For NaI this is not necessarily expected as the large size of the I− ion relative to Na+ would indicate that next-nearest-neighbor interactions could be important. The equation is quite unsatisfactory for NaF, which is quite surprising as this should be a typical ionic crystal.
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Pagannone et al. (1965) studied this question.
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