Raman and Ftir Spectral Investigations of Twinned M(IO3)2 (M = Mn, Ni, Co, AND Zn) Crystals

Kochuthresia, T. C.; Gautier‐Luneau, Isabelle; Vaidyan, V. K.; Bushiri, M. Junaid

doi:10.1007/s10812-016-0209-1

Cited by 13 publications

(41 citation statements)

References 17 publications

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“…Two additional frequencies could be foreseen, since degeneracy of the two asymmetric fundamental vibrations 3 and 4 was no longer present [54]. By analogy with other iodates, the five absorption peaks observed between 900 and 630 cm −1 could be assigned to the I-O stretching vibrations of the IO3 polyhedron, but the occurrence in the LiZn(IO3)3 structure of pyramidal IO3 − ions and of IO6 octahedral units made the IR spectra more complicated [12]. It was therefore difficult to assign the bands unambiguously, especially as the pyramidal and octahedral geometries were distorted.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…In addition, their properties are known to strongly depend on the growth conditions [11]. Transition metal iodates free of OH inclusions, e.g., Zn(IO 3 ) 2 , have thus been developed as alternative materials with high SHG efficiency [12]. It is generally accepted that the important electro and nonlinear optical properties of metal iodates originate from the lone electron pair of iodine in the IO 3 − iodate anion [13].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

et al. 2019

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Synthesis and characterization of anhydrous LiZn(IO3)3 powders prepared from an aqueous solution are reported. Morphological and compositional analyses were carried out by using scanning electron microscopy and energy-dispersive X-ray measurements. The synthesized powders exhibited a needle-like morphology after annealing at 400 °C. A crystal structure for the synthesized compound was proposed from powder X-ray diffraction and density-functional theory calculations. Rietveld refinements led to a monoclinic structure, which can be described with space group P21, number 4, and unit-cell parameters a = 21.874(9) Å, b = 5.171(2) Å, c = 5.433(2) Å, and  = 120.93(4)°. Density-functional theory calculations supported the same crystal structure. Infrared spectra were also collected, and the vibrations associated with the different modes were discussed. The non-centrosymmetric space group determined for this new polymorph of LiZn(IO3)3, the characteristics of its infrared absorption spectrum, and the observed second-harmonic generation suggest it is a promising infrared non-linear optical material.

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Section: Ftir Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

et al. 2019

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“…This is in agreement with previous phonon studies on M(IO 3 ) 2 , with M = Ni, Mn, Co, and Zn and related compounds, as well as systematic tables of vibrational frequencies. 37−39…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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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.

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“…Two additional frequencies can be foreseen since degeneracy of the two asymmetric fundamental vibrations 3 and 4 is no longer present [51]. By analogy with other iodates, the five absorption peaks observed between 900 and 630 cm −1 can be assigned to the I-O stretching vibrations of the IO3 polyhedron but occurrence in the LiZn(IO3)3 structure of pyramidal IO3 -ions and of IO6 octahedral units makes the IR spectra more complicate [12]. It is therefore difficult to assign the bands unambiguously, especially as the pyramidal and octahedral geometries are distorted.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…Transition metal iodates, free of OH inclusions, e.g. Zn(IO3)2, have thus been developed as alternative materials with high SHG efficiency [12]. It is generally accepted that the important electro-and nonlinear optical properties of metal iodates originate from the lone electron pair of iodine in the IO3 -iodate anion [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO<sub>3</sub>)<sub>3</sub>

Hebboul¹,

Galez²,

Benbertal³

et al. 2019

Preprint

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Synthesis and characterization of anhydrous LiZn(IO3)3 powders prepared from an aqueous solution are reported. Morphological and compositional analyses were carried out by scanning electron microscopy and energy dispersive X-ray measurements. The synthesized powders exhibit a needle-like morphology after annealing at 400°C. A crystal structure for the synthesized compound has been proposed from powder X-ray diffraction and density-functional theory calculations. Rietveld refinements led to a monoclinic structure, which can be described with space group P21, number 4, and unit-cell parameters a = 21.874(9) Å, b = 5.171(2) Å, c = 5.433(2) Å, and beta = 120.93(4)º. Density-functional theory calculations supported the same crystal structure. Infrared spectra were also collected and the vibrations associated to the different modes discussed. The non-centrosymmetric space group determined for this new polymorph of LiZn(IO3)3, the characteristics of its infrared absorption spectrum, and the observed second harmonic generation suggest a promising infrared non-linear optical material.

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Raman and Ftir Spectral Investigations of Twinned M(IO3)2 (M = Mn, Ni, Co, AND Zn) Crystals

Abstract: International audienc

Cited by 13 publications

References 17 publications

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

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

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO<sub>3</sub>)<sub>3</sub>

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Raman and Ftir Spectral Investigations of Twinned M(IO3)2 (M = Mn, Ni, Co, AND Zn) Crystals

Abstract: International audienc

Cited by 13 publications

References 17 publications

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO3)3

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

Synthesis, Characterization, and Crystal Structure Determination of a New Lithium Zinc Iodate Polymorph LiZn(IO<sub>3</sub>)<sub>3</sub>

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