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In page Potassium chloride:

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Potassium chlorides with formulas other than KCl have been predicted to become stable under pressures of 20 GPa or more.[1] Among these, two phases of KCl3 were synthesized and characterized. At 20-40 GPa, a trigonal structure containing K+ and Cl3 is obtained; above 40 GPa this gives way to a phase isostructural with the intermetallic compound Cr3Si.[citation needed]