Iodate nitrates are mixed anion compounds that contain both iodate and nitrate anions.
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[1] and sodium hydrogen squarate hydrate, NaHC4O4·H2O with a value of 0.52 at 1064 nm.[2] All of these are beaten by hexagonal boron nitride (h-BN) with birefringence of 0.7 in visible light.[3]
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 | [4] | ||||
KIO3•KNO3•2HIO3 | dipotassium dihydrogen triiodate nitrate | orthorhombic | P212121 | a=7.109 b=10.638 c=15.5 | [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 | [6] |
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 | [7] |
[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 | [7] | |
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 | [8] | |||
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 | [9] |
α-Th(IO3)2(NO3)(OH) | triclinic | P1 | a=6.9581 b=7.2294 c=9.8989 α=68.896° β=88.759° γ=66.620° | [10] | |||||
β-Th(IO3)2(NO3)(OH) | orthorhombic | Pbca | a=7.1459 b=14.140 c=16.612 | [10] |