Abstract
The resistance of magnesium, calcium, strontium, and barium have been measured to 600 kbar at temperatures from 77 to 296\ifmmode^\circ\else\textdegree\fi{}K.Magnesium shows some shallow maxima and minima in resistance along an isotherm, but no striking features. Calcium has a phase transition at about 150 kbar to a semimetallic phase, and a second transition initiating near 300 kbar, to a metallic state. Strontium has a sharp maximum in resistance below 40 kbar. Near the maximum it may be a semimetal. There is then a phase transition to metallic phase.Barium exhibits a very sharp rise in resistance at 140 kbar at 296\ifmmode^\circ\else\textdegree\fi{}K (190 kbar at 197\ifmmode^\circ\else\textdegree\fi{}K). At 77\ifmmode^\circ\else\textdegree\fi{}K there is a transition at 240 kbar which is somewhat more sluggish. Isobars obtained on this high-pressure phase indicate a very sharp transition near 160\ifmmode^\circ\else\textdegree\fi{}K. The evidence indicates that barium is a liquid at high pressure above 160\ifmmode^\circ\else\textdegree\fi{}K.
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