# Iodate sulfate

Iodate sulfates are mixed anion compounds that contain both iodate and sulfate anions. Iodate sulfates have been investigated as optical second harmonic generators, and for separation of rare earth elements. Related compounds include the iodate selenates and chromate iodates.
Iodate sulfates can be produced from water solutions of iodic acid and sulfate salts.

## List

| formula | name | formula weight | system | space group | cell Å | volume | density | comments |
| Na$_7$(IO$_3$)(SO$_4$)$_3$ | | 624.01 | orthorhombic | P2$_1$2$_1$2$_1$ | a=6.839 b=10.851 c=18.519 Z=4 | 1374.2 | 3.016 | at 100K; band gap 4.83; SHQ 0.5×KDP; birefringence 0.075 at 1064 nm |
| Na$_9$(IO$_3$)(SO$_4$)$_4$ | Hectorfloresite | | monoclinic | P2$_1$/a | a = 18.775 b = 6.9356 c = 14.239 β = 108.91° Z = 4 | | | |
| K$_2$SO$_4$·HIO$_3$ | | 350.17 | monoclinic | P2$_1$/n | a=7.4215 b=7.1578 c=13.802 β=93.330° Z=4 | 731.9 | 3.178 | colourless; birefingence 0.14 at 589.3 nm; UV edge 275 nm |
| K$_3$Na$_5$Mg$_5$(IO$_3$)$_6$(SO$_4$)$_6$(H$_2$O)$_5$ | | | trigonal | P3c1 | | | | |
| K$_{7.2}$Na$_{8.8}$Mg$_{10}$(IO$_3$)$_{12}$(SO$_4$)$_{12}$(H$_2$O)$_{12}$ | Fuenzalidaite | | trigonal | P3c1 | a = 9.4643 c = 27.336 | 2,120.52 | | colourless; Uniaxial (-) n$_ω$ = 1.622 n$_ε$ = 1.615; Birefringence = 0.007 |
| Nb$_2$O$_3$(IO$_3$)$_2$(SO$_4$) | | 679.68 | monoclinic | P2$_1$ | a=5.299 b=20.479 c=5.452 β=119.095° Z=2 | 517.0 | 4.366 | band gap 3.25; SHG 6 × KDP; birefringence 0.22 at 1064 nm; stable below 580 °C |
| Ce(IO$_3$)$_2$(SO$_4$) | CISO | 585.98 | orthorhombic | P2$_1$2$_1$2$_1$ | a=7.5366 b=8.9787 c=11.6121 Z=4 | 785.78 | 4.953 | yellow; SHG 3.5 × KDP; birefringence 0.259 at 546 nm |
| Sm(IO$_3$)(SO$_4$) | | | monoclinic | P2$_1$/c | a=9.3148 b=6.8678 c=8.2852 β=104.701° | | | |
| Sm$_2$(IO$_3$)$_3$(SO$_4$)OH·3H$_2$O | | | triclinic | P1 | a 7.3858 b 9.6166 c 11.8629 α=66.482° β=76.884° γ=69.101° | | | |
| Eu(IO$_3$)(SO$_4$) | | | monoclinic | P2$_1$/c | a=9.3083 b=6.8460 c=8.2575 β=104.696° | | | |
| Eu$_2$(IO$_3$)$_3$(SO$_4$)OH·3H$_2$O | | | triclinic | P1 | a=7.3666 b=9.5817 c=11.8263 α=66.5365° β=76.8591° γ=69.1131° | | | |
| Dy(IO$_3$)(SO$_4$)(H$_2$O) | | | orthorhombic | P2$_1$2$_1$2$_1$ | a=7.3088 b=9.4824 c=11.7302 α=66.6573° β=76.8745° γ=69.2970° | | | |
| Dy(IO$_3$)(SO$_4$)(H$_2$O)$_3$ | | | orthorhombic | P2$_1$2$_1$2$_1$ | a=6.682 b=8.791 c=13.632 | | | |
| Dy$_2$(IO$_3$)$_3$(SO$_4$)OH·3H$_2$O | | | triclinic | P1 | | | | |
| Hg$_2$(IO$_3$)$_2$(SO$_4$) | | | monoclinic | C2/c | a=12.040 b=4.7133 c=15.533 β=102.43° | | | |
| Hg$_2$(IO$_3$)$_2$(SO$_4$)(H$_2$O) | | | monoclinic | C2 | a=11.767 b=4.9190 c=7.8076 β=97.10° | | | band gap 3.98 eV; SHG 6 × KDP; dehydrate 250 °C |
| Bi(IO$_3$)(SO$_4$) | | 479.94 | monoclinic | P2$_1$/c | a=9.4355 b=6.9168 c=8.3374 β=105.168° Z=4 | 525.17 | 6.070 | band gap 3.91 eV; birefringence 0.087 at 1064 nm; colourless |
| Bi$_2$O(SO$_4$)(IO$_3$)$_2$ | | | monoclinic | P2$_1$/n | a=7.2391 b=17.907 c=7.7964 β = 109.652° Z =4 | | | |
| AgBi(SO$_4$)(IO$_3$)$_2$ | | 1525.42 | triclinic | P1 | a=5.5189 b=6.9129 c=11.8527 α=90.598° β=92.151° γ=109.895° Z=1 | 424.78 | 5.963 | colourless; SHG 3.0 × KDP |
| CdBi(IO$_3$)(SO$_4$)$_2$ | | 688.40 | monoclinic | P2$_1$/c | a=12.777 b=6.8491 c=9.984 β=103.23° Z=4 | 850.5 | 5.376 | band gap 4.03 eV; birefringence 0.100 at 1064 nm |