High-pressure x-ray-diffraction and optical-absorption studies of NH4I to 75 GPa

Seung Joon Jeon, Richard F. Porter, Yogesh K. Vohra, Arthur L. Ruoff

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The structure of NH4I has been studied by energy-dispersive x-ray diffraction at pressures between 1.3 and 68 GPa, and by optical-absorption techniques at pressures up to 75 GPa. The solid has a CsCl-type structure over the pressure range studied. A first-order Birch equation of state was used to calculate the bulk modulus and its first pressure derivative. The band gap drops from 5.5 eV at atmospheric pressure to 0.86 eV at 74.8 GPa and the extrapolation of data suggests metallization in the neighborhood of 1.2 Mbar (120 GPa).

Original languageEnglish
Pages (from-to)4954-4958
Number of pages5
JournalPhysical Review B
Issue number10
Publication statusPublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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