crystal data
Method of growth and chemical characterization of single crystals of Pr(IO3)3. HIO3 and 3La(IO3)3. HIO3.7H2O are given together with the powder data. Pr(IO3)3.HIO3 is monoclinic, a = 14.237±0.006, b = 7.578± 0.003, c = 10.616±0.005 Å, β = 110.48±0.04° at 298 K with space group P21/a and four formulas perunit cell. 3La(IO3)3.HIO3.7H2O is orthorhombic, a = 13.18008±0.00010, b = 21.72076±0.00010, c = 12.15514±0.00018 Å at 298 K with space group Aba2 and four formulas per unit cell. The hydrated La acid salt generates second harmonics: the pyroelectric coefficient p3 = 2.1 x 10−5 Cm−2 deg−1. Mo K radiation produces a bright orange coloration.