Английская Википедия:Iodate nitrate

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Iodate nitrates are mixed anion compounds that contain both iodate and nitrate anions.

Giant birefringence

Iodate nitrates can have high birefringence. The scandium salt has a giant birefringence of 0.348 at 546 nm. When discovered in 2021 it was a record high birefringence for oxyanion compounds, but it was exceeded by CeF₂(SO₄) just a month later with a value of 0.361 and sodium hydrogen squarate hydrate, NaHC₄O₄·H₂O with a value of 0.52 at 1064 nm. All of these are beaten by hexagonal boron nitride (h-BN) with birefringence of 0.7 in visible light.

List

formula	name	formula weight	system	space group	cell Å	volume	density	comments	ref
Al(IO3)2NO3•6H2O	aluminium diiodate nitrate hexahydrate		hexagonal	P321	a=6.764 c=8.09 Z=1
KIO3•KNO3•2HIO3	dipotassium dihydrogen triiodate nitrate		orthorhombic	P212121	a=7.109 b=10.638 c=15.5
Sc(IO3)2(NO3)	scandium diiodate nitrate	1370.31	trigonal	R32	a=5.3536 c=23.567 Z=1	584.96	3.890	colourless; giant birefringence 0.348 at 546 nm; SHG 4.0×KDP; UV edge 298 nm; stable to 360°C
In(IO3)2(NO3)	indium diiodate nitrate	526.63	trigonal	R32	a=5.2165 c=24.195, γ=120° Z=3	570.2	4.601	colourless
[In(IO3)(OH)(H2O)](NO3)		386.75	monoclinic	P21/n	a=5.5756 b=16.410 c=7.734, β=109.95 Z=4	665.2	3.862	colourless
La(IO3)2(NO3)	lanthanum diiodate nitrate		trigonal	P3121	a=7.1002 c=38.177 Z=9			SHG 0.6 × KDP; band gap 4.23 eV
Ce(IO3)2(NO3)	cerium diiodate nitrate	551.93	trigonal	P3121	a=7.0537 c=37.972 Z=9	1639.8	5.030	SHG 1 × KDP
α-Th(IO3)2(NO3)(OH)			triclinic	PШаблон:Overbar	a=6.9581 b=7.2294 c=9.8989 α=68.896° β=88.759° γ=66.620°
β-Th(IO3)2(NO3)(OH)			orthorhombic	Pbca	a=7.1459 b=14.140 c=16.612