Synthesis and Magnetic Properties of the KCu(IO₃)₃ Compound with [CuO₅]_∞ Chains

Abstract

The new quaternary iodate KCu(IO3)3 has been prepared by hydrothermal synthesis. KCu(IO3)3 crystallizes in the monoclinic space group P21/n with unit cell parameters a = 9.8143(4) Å, b = 8.2265(4) Å, c = 10.8584(5) Å, β = 91.077(2)°, and z = 4. The crystals are light blue and translucent. There are three main building units making up the crystal structure: [KO10] irregular polyhedra, [CuO6] distorted octahedra, and [IO3] trigonal pyramids. The Jahn–Teller elongated [CuO6] octahedra connect to each other via corner sharing to form [CuO5]∞ zigzag chains along [010]; the other building blocks separate these chains. The Raman modes can be divided into four groups; the lower two groups into mainly lattice modes involving K and Cu displacements and the upper two groups into mainly bending and stretching modes of [IO3E], where E represents a lone pair of electron. At low temperatures, the magnetic susceptibility is characterized by a broad maximum centered at ∼5.4 K, characteristic for antiferromagnetic short-range ordering. Long-range magnetic ordering at TC = 1.32 K is clearly evidenced by a sharp anomaly in the heat capacity. The magnetic susceptibility can be very well described by a spin S = 1/2 antiferromagnetic Heisenberg chain with a nearest-neighbor spin exchange of ∼8.9 K.

Synthesis and Characterization of Two New Second Harmonic Generation Active Iodates: K3Sc(IO3)6 and KSc(IO3)3Cl

“…However, bending modes are also expected in the range 300−450 cm −1 . 24,25 The rather different effect of temperature on the modes is due to the different mechanisms of anharmonicity that collective phonon vibrations and local modes are experiencing. A collective optical vibration can decay into pairs of acoustic modes based on the anharmonicity of the lattice potential.…”

Crystal structure and X-ray powder diffraction data of barium copper iodate Ba2Cu(IO3)6

“…The Cu 2+ ion possesses a partially filled d -orbital and usually occupies a distorted octahedral CuO 6 coordination geometry; hence, the combination of copper cations with iodate groups is expected to form novel structures with various connection fashion of CuO 6 units, and may further afford interesting magnetic properties. As far, only seven Cu-containing quaternary iodates, NaCu(IO 3 ) 3 (Sen Gupta et al, 1987), AgCu(IO 3 ) 3 (Wang et al, 2017), KCu(IO) 3 (Mitoudi-Vagourdi et al, 2019), and Ln Cu(IO 3 ) 5 ( Ln = La, Ce, Pr, and Nd) (Geng et al, 2022), have been reported. In this study, a new Cu-containing quaternary iodate, namely, Ba 2 Cu(IO 3 ) 6 , has been synthesized.…”

MIO3F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

“…However, iodates for magnetic properties have rarely been reported. − In particular, none of the magnetic iodate fluorides has been synthesized and reported yet till now. Here, we first report two new magnetic iodate fluorides MIO 3 F (M = Co 1 and Ni 2 ) by a hydrothermal method with interesting magnetic properties.…”