Phonon characteristics and dielectric properties of a phase pure CoWO4 ceramic

Xiao, En-Cai; Liu, Mengting; Ren, Qi; Cao, Zhikai; Guo, Mei; Dou, Gang; Qi, Zeming; Shi, Feng

doi:10.1016/j.ceramint.2020.03.049

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…41 Nonetheless, for CoWO 4 , the frequency of some of the modes differs significantly among previous experimental reports. 38,[44][45][46][47] These discrepancies are mostly observed in the low-frequency range, i.e. mostly external modes are affected.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

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Electronic properties and high-pressure behavior of wolframite-type CoWO₄

et al. 2021

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Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

“…The distribution of calculated IR modes is in good agreement with previous results. 46 Similarly to the Raman modes, IR phonons generally harden with pressure. Only one B u mode around 247 cm -1 appears to have a small negative pressure coefficient.…”

Section: Experiments Theorymentioning

confidence: 99%

Electronic properties and high-pressure behavior of wolframite-type CoWO₄

et al. 2021

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“…Unfortunately, our FT-IR equipment is limited. Moreover, this technique 6(a,b)) [10,105]. Also observed was a %] bonds in distorted octahedral [WO 6 ] clusters [108].…”

Section: Atomsmentioning

confidence: 74%

“…According to the literature [4], CoWO 4 crystals are not recognized as a natural mineral by the International Mineralogical Association (IMA) [5,6]. These crystals are oxides belonging to the wolframite family [7] with a general formula (AWO 4 ) (A = Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , and Zn 2+ ), space group (P2/c), symmetry point group (C 4 2h Þ, two molecular formula units per unit cell (Z = 2) and n°13 in the international crystallography table [8][9][10][11][12]. Among the transition metals belonging to the fourth period of the periodic table (from d 5 to d 10 ), only the tungstate cooper (CuWO 4 ) does not present a wolframite-type monoclinic structure [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

Oliveira

Gouveia

Costa

et al. 2022

Materials Science for Energy Technologies

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“…In this way, different types of materials were assessed to maximize the nonlinear optical properties. Due to its fascinating size and structure-dependent optical and electronic features, CoWO4 has attracted much attention as a significant inorganic material [9]. CoWO4 is a p-type semiconductor known for its amazing optical, electrical, and magnetic features.…”

Section: Introductionmentioning

confidence: 99%

Effect of MnO2 and MnO2-NCNO addition on structural and nonlinear optical properties of CoWO4 ceramics

Nadafan

Ghalkhani

Sohouli

2021

Preprint

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The nitrogen-doped carbon nano-onions (NCNOs) were prepared by annealing the ultra-dispersed aminated-nanodiamond solution under He gas at 1150°C followed by calcination at 400°C. The nanostructures of CoWO4, MnO2, CoWO4-MnO2, and CoWO4-MnO2-NCNO were synthesized through the simple precipitation method under ultrasonication followed by calcination at 450°C. The morphology, structure, and optoelectronic properties of the samples were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Z-scan method. The homogeneous distribution of the tiny aggregated plate-like and spongy particles throughout the nanocomposite created a highly porous nanostructure with a large surface area. The nonlinear absorption (NLA) coefficient and nonlinear refractive (NLR) index were of the order of 10-3(cm/W) and 10-8(cm2/W), respectively. In different incident intensity of laser, all synthesized samples show TPA effect implying the positive sign of NLA coefficient. MnO2 and NCNO structure have positive NLR index indicating the self-focusing optical nonlinearity. The self-defocusing effect and the negative sign of nonlinearity in the CoWO4 nanoparticles, MnO2-CoWO4, and MnO2-NCNO-CoWO4 nanocomposites are vivid. The porous structure of CoWO4 nanoparticles and trapping the light into CoWO4 nanoparticles are the main reasons for nonlinearity of this nanoparticles. Porosity is also one of the most important reasons for the nonlinear optical responses of NCNO structure. The NLR index and NLA coefficient of MnO2 decreased by increasing the incident intensity. Moreover, an increase in the incident intensity improved the nonlinear responses in the rest of samples. The present nonlinear optical results of the synthesized samples can be applied in optical devices.

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Phonon characteristics and dielectric properties of a phase pure CoWO4 ceramic

Cited by 8 publications

References 17 publications

Electronic properties and high-pressure behavior of wolframite-type CoWO₄

Electronic properties and high-pressure behavior of wolframite-type CoWO₄

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

Effect of MnO2 and MnO2-NCNO addition on structural and nonlinear optical properties of CoWO4 ceramics

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Phonon characteristics and dielectric properties of a phase pure CoWO4 ceramic

Cited by 8 publications

References 17 publications

Electronic properties and high-pressure behavior of wolframite-type CoWO4

Electronic properties and high-pressure behavior of wolframite-type CoWO4

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

Effect of MnO2 and MnO2-NCNO addition on structural and nonlinear optical properties of CoWO4 ceramics

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Electronic properties and high-pressure behavior of wolframite-type CoWO₄

Electronic properties and high-pressure behavior of wolframite-type CoWO₄