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The pressure dependence of the exchange-narrowed triplet-exciton magnetic resonance in (φ3PCH3)+-(TCNQ)2− and (φ3AsCH3)+(TCNQ)2− has been observed at 170 Mc/sec in the ranges 1–9 kbar, and 220°—362°K. Pressure-induced phase transitions in these salts are reported. The observed p—T phase diagram for (φ3AsCH3)+(TCNQ)2− can be explained remarkably well in terms of an elementary theory of non-interacting triplet excitons.
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Merkl et al. (1965) studied this question.
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