Abstract
The sound wave velocity of lime-rich minerals and rocks has been a subject of inquiry, because it does not fit into Birch's law [Birch, 1961]: ‘the compressional wave velocity is expressible in terms of density, ρ, and mean atomic weight, m, by υp = a + bρ + cm, where a, b, and c are constants.’ In spite of the high value of m, lime-rich rocks exhibited higher velocity values than expected from Birch's empirical relationship. To correct this discrepancy, Simmons [1964a] introduced into Birch's equation the weight fraction of CaO as a variable in addition to ρ and m. Simmons' relationship is ((1)) Obviously, to solve this problem the actual data of sound wave velocity of CaO are needed. To accomplish this data collection, several polycrystalline CaO specimens were fabricated with the vacuum hot-press of the Mechanics Research Department of Bell Telephone Laboratories. CaO powder of Fisher-certified chemical reagent grade was used.
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