Li_(2)NH_(4)(IO_(3))_(3) single crystal with dimension of 14x14x27mm^(3) has been grown by cooling method.The cell parameters measured by four-cycle diffractometer are:a=11.317Å,b=ll.066Å,c=8.330Å,β=111.25°.The infrared absorption spectrum,transmission curve and refractive index have also been measured for the first time.
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