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Metastable Polymeric Nitrogen From N2H2 Alloys
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Studies of high-density binary mixtures of simple molecular solids have uncovered a new aspect of high pressure chemistry. In contrast 10 the many previous studies on relatively inert mixtures, here we show that high pressures can lead 10 unexpected behavior in reactive compounds. Raman studies were performed on nitrogen and hydrogen binary alloys al room temperature to 83 GPa To pressures of 30 GPa, large vibron deviations from those of the pure materials suggest complex phase behavior. An unusual phase separation is observed near 35 GPa, which results in two distinct solid phases, one rich in both nitrogen and hydrogen and the other relatively amorphous. Spectroscopic signatures that can be attributed to N-N stretching were observed at high pressures.
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