Abstract
An in situ X-ray powder diffraction experiment evaluated by a Rietveld-type refinement shows that NH 4 -Rho zeolite, Cs(NH 4 ) 11 Al 12 Si 36 O 96 , exists in two forms when heated in vacuum. The high-temperature form has at 573 K:a=14.4803 (1) A, D x =1.688 g cm -3 , and when quenched at 295 K:a=14.4024 (6) A, D x =1.716 g cm -3 ; the low-temperature form after prolonged cooling in vacuum at 295 K gives a=14.8168 (2) A, D x =1.576 g cm -3
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