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首页> 美国政府科技报告 >HIGH-PRESSURE INVESTIGATIONS OF GROUP ⅢELEMENTS:PART I:FUSION CURVES AND POLYMORPHIC TRANSITIONS OF ALUMINUM, GALLIUM, INDIUM, AND THALLIUM AT HIGH PRESSURES PART II:PHASE TRANSFORMATIONS IN URANIUM AT HIGH PRESSURES
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HIGH-PRESSURE INVESTIGATIONS OF GROUP ⅢELEMENTS:PART I:FUSION CURVES AND POLYMORPHIC TRANSITIONS OF ALUMINUM, GALLIUM, INDIUM, AND THALLIUM AT HIGH PRESSURES PART II:PHASE TRANSFORMATIONS IN URANIUM AT HIGH PRESSURES

机译：第Ⅲ组的高压研究：第一部分：高压下铝，镓，铟和铊的熔融曲线和多晶态转变第二部分：高压下铀的相变

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The fusion curves of aluminum and thallium to 50 kbar, and of gallium to 70 kbar, were investigated by differential thermal analysis (DTA). Com¬parison is made with previous work and with the fusion curve of indium. A break in slope of the melting curve of gallium near 45°C and 30 kbar led to the discovery of a new polymorph. This phase — Ga III— is slightly less dense than Ga II, both persisting to 75 kbar. Solid-solid phase boundaries for gallium and thallium were determined by changes in volume and resist¬ance as well as with DTA. The Ga II to Ga III transition is rapid and charac¬terized by a substantial heat as well as a drop in resistance. From the inves¬tigation of the metastability phenomena, it is tentatively concluded that Ga III is identical with Bridgman' s Ga II and that the metastable phase studied by Defrain at one atmosphere is closely related to Ga II.

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