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The thermodynamics of ammonium scheelites IV. Heat capacity of ammonium metaperiodate NH4IO4from 8 to 324 K

Authors
Journal
The Journal of Chemical Thermodynamics
0021-9614
Publisher
Elsevier
Publication Date
Volume
19
Issue
7
Identifiers
DOI: 10.1016/0021-9614(87)90092-9
Disciplines
  • Physics

Abstract

Abstract The heat capacity of the scheelite salt ammonium metaperiodate, NH 4IO 4, was measured from 8 to 324 K using adiabatic calorimetry. The heat capacity against temperature curve shows an excess with a maximum around 200 K as is typical of other ammonium scheelites. A small peak in the curve near 270 K resulted from melting a saturated aqueous solution trapped in the lattice. Values of the standard molar thermodynamic quantities for NH 4IO 4 are presented up to 320 K. Values for C p, m o(298.15 K ) R , Δ 0 TS m o(298.15 K ) R , and Φ m o(298.15 K, 0)/ R are (18.58±0.02), (23.03±0.04), and (11.20±0.02), respectively.

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