Premium
Stabilities and cell parameters for phases of the AgI–NH 4 I–H 2 O system
Author(s) -
Johnson L. R.,
Davis B. L.
Publication year - 1976
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889876010698
Subject(s) - monoclinic crystal system , ammonium iodide , orthorhombic crystal system , iodide , silver iodide , phase (matter) , powder diffraction , crystallography , chemistry , analytical chemistry (journal) , ammonium , materials science , inorganic chemistry , crystal structure , organic chemistry , layer (electronics) , silver halide
The density, composition, X‐ray powder data, unit‐cell parameters, and stability fields are reported for five phases of the AgI–NH 4 I–H 2 O chemical system. The determinations were made by X‐ray powder diffraction but with some aid from polarizing optical microscopy. Provisional cell assignments are: phase A n (4AgI.NH 4 I) is cubic, phase B n (3AgI.NH 4 I.6H 2 O) monoclinic, phase C n (AgI.2NH 4 I) orthorhombic, phase En (AgI.2NH 4 I.H 2 O) orthorhombic, and phase F n (2AgI.NH 4 I.2H 2 O) monoclinic. Upon combustion of an acetone solution of silver iodide and ammonium iodide, phase A n forms and, when injected into the atmosphere, transforms to phases F n or B n as determined by the available moisture and temperature.