High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Liang, Akun; Turnbull, Robin; Bandiello, Enrico; Yousef, Ibraheem; Popescu, Cătălin; Hebboul, Zoulikha; Errandonea, Daniel

doi:10.3390/cryst11010034

Cited by 11 publications

(7 citation statements)

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“…By analogy with other iodates, the two vibrational frequencies of LiAl(IO3)4 observed at around 660 cm −1 and 786 cm −1 can be tentatively assigned as the symmetric (𝜈 at 780-630 cm −1 ) and anti-symmetric (𝜈 at 730-820 cm −1 ) stretching internal modes of the pyramidal IO3 -ion, respectively. These values are compatible with the equivalent modes of Al(IO3)3 [48], La(IO3) [22], Zn(IO3)2 [26], and LiZn(IO3)3 [37], among other iodates.…”

Section: Ftir Uv-vis and Shg Measurementssupporting

confidence: 81%

“…Many different families of nanomaterials have been studied with the aim of enhancing medical and NLO applications [18][19][20]. Metal iodates are considered to be among the most interesting nanomaterials [21][22][23][24][25][26][27][28][29], not only for NLO but also because of their dielectric properties and their unusual bonding properties, related to the presence of an electron lone pair on the iodine atom [30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Chikhaoui

Hebboul

Fadla³

et al. 2021

Nanomaterials

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Here we report on the non-hydrothermal aqueous synthesis and characterization of nanocrystalline lithium aluminum iodate, LiAl(IO3)4. Morphological and compositional analyses were carried out by using scanning electron microscopy (SEM) and energy-dispersive X-ray measurements (EDX). The optical and vibrational properties of LiAl(IO3)4 have been studied by UV-Vis and IR spectroscopy. LiAl(IO3)4 is found to crystallize in the non-centrosymmetric, monoclinic P21 space group, contrary to what was reported previously. Theoretical simulations and Rietveld refinements of crystal structure support this finding, together with the relatively high Second Harmonic Generation (SGH) response that was observed. Electronic band structure calculations show that LiAl(IO3)4 crystal has an indirect band gap Egap=3.68 eV, in agreement with the experimental optical band gap Egap=3.433 eV. The complex relative permittivity and the refraction index of LiAl(IO3)4 have also been calculated as a function of energy, as well as its elastic constants and mechanical parameters. LiAl(IO3)4 is found to be a very compressible and ductile material. Our findings imply that LiAl(IO3)4 is a promising material for optoelectronic and non -linear optical applications.

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Section: Ftir Uv-vis and Shg Measurementssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Chikhaoui

Hebboul

Fadla³

et al. 2021

Nanomaterials

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“…The non-linear pressure dependence exhibited by the wavenumbers of the IR modes is like that of the Raman-active modes, thus providing further evidence of the two subtle symmetry-preserving phase transitions we have previously described. It can be also mentioned that the non-linear pressure dependence of the IR-active modes has also been reported for Zn(IO 3 ) 2 as evidence of the presence of isostructural phase transitions …”

Section: Resultsmentioning

confidence: 72%

Pressure-Driven Symmetry-Preserving Phase Transitions in Co(IO₃)₂

et al. 2021

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High-pressure synchrotron X-ray diffraction studies of cobalt iodate, Co(IO3)2, reveal a counterintuitive pressure-induced expansion along certain crystallographic directions. High-pressure Raman and infrared spectroscopy, combined with density-functional theory calculations, reveal that with increasing pressure, it becomes energetically favorable for certain I–O bonds to increase in length over the full range of pressure studied up to 28 GPa. This phenomenon is driven by the high-pressure behavior of iodate ion lone electron pairs. Two pressure-induced isosymmetric monoclinic–monoclinic phase transitions are observed at around 3.0 and 9.0 GPa, which are characterized by increasing oxygen coordination of the iodine atoms and the probable formation of pressure-induced metavalent bonds. Pressure–volume equations of state are presented, as well as a detailed discussion of the pressure dependences of the observed Raman- and infrared-active modes, which clarifies previous inconsistencies in the literature.

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“…We chose KBr as the pressure-transmitting medium in our experiments. A ruby ball is loaded to serve as an internal pressure standard, and the pressure is determined by the R1-R2 line shift of the ruby ball. , Pressure was measured with an accuracy of 0.1 GPa.…”

Section: Experimental Methodsmentioning

confidence: 99%

Tunable Photocarrier Dynamics in CuS Nanoflakes under Pressure Modulation

Han,

Ma,

Miao

et al. 2024

ACS Omega

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Two-dimensional materials with a unique layered structure have attracted intense attention all around the world due to their extraordinary physical properties. Most importantly, the internal Coulomb coupling can be regulated, and thus electronic transition can be realized by manipulating the interlayer interaction effectively through adding external fields. At present, the properties of two-dimensional materials can be tuned through a variety of methods, such as adding pressure, strain, and electromagnetic fields. For optoelectronic applications, the lifetime of the photogenerated carriers is one of the most crucial parameters for the materials. Here, we demonstrate effective modulation of the optical band gap structure and photocarrier dynamics in CuS nanoflakes by applying hydrostatic pressure via a diamond anvil cell. The peak differential reflection signal shows a linear blueshift with the pressure, suggesting effective tuning of interlayer interaction inside CuS by pressure engineering. The results of transient absorption show that the photocarrier lifetime decreases significantly with pressure, suggesting that the dissociation process of the photogenerated carriers accelerates. It could be contributed to the phase transition or the decrease of the phonon vibration frequency caused by the pressure. Further, Raman spectra reveal the change of Cu–S and S–S bonds after adding pressure, indicating the possible occurrence of structural phase transition. Interestingly, all of the variation modes are reversible after releasing pressure. This work has provided an excellent sight to show the regulation of pressure on the photoelectric properties of CuS, exploring CuS to wider applications that can lead toward the realization of future excitonic and photoelectric devices modulated by high pressure.

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High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Cited by 11 publications

References 30 publications

Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Pressure-Driven Symmetry-Preserving Phase Transitions in Co(IO₃)₂

Tunable Photocarrier Dynamics in CuS Nanoflakes under Pressure Modulation

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High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Cited by 11 publications

References 30 publications

Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Synthesis and Characterization of Novel Nanoparticles of Lithium Aluminum Iodate LiAl(IO3)4, and DFT Calculations of the Crystal Structure and Physical Properties

Pressure-Driven Symmetry-Preserving Phase Transitions in Co(IO3)2

Tunable Photocarrier Dynamics in CuS Nanoflakes under Pressure Modulation

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Pressure-Driven Symmetry-Preserving Phase Transitions in Co(IO₃)₂