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Ammonium Iodate—A Potentially Useful Nonlinear Optical Material
Author(s) -
CRANE G. R.,
BERGMAN J. G.,
GLASS A. M.
Publication year - 1969
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1969.tb16070.x
Subject(s) - pyroelectricity , piezoelectricity , iodate , crystal (programming language) , symmetry (geometry) , phase transition , precession , order (exchange) , space (punctuation) , chemistry , materials science , analytical chemistry (journal) , crystallography , mineralogy , physics , condensed matter physics , iodine , composite material , dielectric , geometry , ferroelectricity , mathematics , optoelectronics , chromatography , computer science , programming language , organic chemistry , philosophy , linguistics , finance , economics
The space group of NH 4 IO 3 was determined, from precession photographs and observations of symmetry‐related characteristics, to be Pna 2 1 . The cell constants are a 0 = 6.3740 ± 0.0005, b 0 = 6.4115±0.0005, and c 0 =9.1706±0.0005 Å. The crystal is piezoelectric along all three axes and pyroelectric with dP/dT ⋍(3±1)×10 −9 C/cm 2 °C along the c 0 axis at room temperature. At 85°C a first‐order transition to a nonpolar piezoelectric phase is observed.