Infrared Absorption of NiO

Johnston, R. W.; Cronemeyer, D. C.

doi:10.1103/physrev.93.634

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…The absorption spectrum of NiO in mid-infrared spectral range has a band at ~2000 cm -1 (0.24 eV), observed previously in [5][6][7][8][9][10]. This band was attributed to an impurity induced absorption in [5]. However, further studies have shown its connection with magnetic ordering in .…”

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confidence: 78%

Influence of diamagnetic impurity on mid‐IR absorption in antiferromagnetic insulator NiO

Миронова-Улмане

Kuzmin

Guidi

et al. 2005

phys. stat. sol. (c)

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The influence of diamagnetic magnesium impurities on the absorption band at ~2000 cm -1 was studied in polycrystalline Ni c Mg 1-c O solid solutions with c=0. 99, 0.98, 0.97, 0.95, 0.90, 0.80, 0.70 and 0.60. The composition and temperature dependences of the absorption suggest that the band has magnetic origin related to simultaneous excitation of two-magnons at the Brillouin-zone boundary and one phonon. . The absorption spectrum of NiO in mid-infrared spectral range has a band at ~2000 cm -1 (0.24 eV), observed previously in [5][6][7][8][9][10]. This band was attributed to an impurity induced absorption in [5]. However, further studies have shown its connection with magnetic ordering in . It was found that upon temperature increase, the band becomes less intensive and its position shifts to lower energies, till the band disappears completely above the Nèel temperature [6,7,10]. The energy position of the band was attributed to the joint excitation of two magnons and one phonon [8,9]. The theoretical description of such transitions was given in [10,11] and more recently in [12].The magnetic properties of nickel oxide can be strongly influenced by admixture of non-magnetic ions [13]. For example, Ni c Mg 1-c O solid solutions represent a nice example of diluted antiferromagnetic system. Its magnetic properties vary from antiferromagnetic-like behaviour for c=1, to diamagnetic-like behaviour for c=0 [14,15]. For intermediate compositions with c>0.3, paramagnetic-toantiferromagnetic phase transition occurs upon cooling [14,15].In this work, we have studied the influence of diamagnetic magnesium impurities on the absorption band at ~2000 cm -1 in polycrystalline Ni c Mg 1-c O solid solutions. Polycrystalline solid solutions Ni c Mg 1-c O (c=0.99, 0.98, 0.97, 0.95, 0.90, 0.80, 0.70 and 0.60) were prepared using ceramic technology from the appropriate amounts of aqueous solutions of Mg(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 O salts, which were mixed and slowly evaporated. The remaining dry 'flakes' were heated up to 500-600 ºC to remove NO 2 completely. The obtained polycrystalline solid solutions were pressed and annealed during 100 hours at 1200 ºC in air and then rapidly cooled down to room temperature. The pure polycrystalline NiO and MgO were obtained using the same method by thermal decomposition of the above mentioned salts. These Ni c Mg 1-c O solid solutions have greenish

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confidence: 78%

Influence of diamagnetic impurity on mid‐IR absorption in antiferromagnetic insulator NiO

Миронова-Улмане

Kuzmin

Guidi

et al. 2005

phys. stat. sol. (c)

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“…The transmission T of the sample is about 20% at 0.5 eV (the long wavelength limit of our instrument), decreases with increasing photon energy, and drops to 3 Â 10 À5 (sensitivity limit) at 0.92 eV. The absorption coefficient a can be calculated, taking into account reflection losses and ignoring Rayleigh scattering by gas bubbles, from 15,36 exp ðÀadÞ ¼ T=½ð1 À RÞ 2 ;…”

Section: Samples and Experimental Detailsmentioning

confidence: 99%

“…For example, there has been tremendous interest in the band structure and optical constants of NiO recently among theorists. [4][5][6][7][8][9][10][11][12][13][14] On the other hand, experimental optical evidence of NiO is limited mostly to experiments performed several decades ago using transmission, [15][16][17][18][19] reflection, 16,17,[19][20][21] electroreflectance, 22 and thermoreflectance 21 from the midinfrared to the vacuum-ultraviolet, except for some recent roomtemperature ellipsometry studies. 23 Since theory papers on the band structure of NiO by far outnumber experimental ones, it seems appropriate to perform precision measurements of the optical constants of NiO using spectroscopic ellipsometry over a broad spectral and temperature range.…”

Section: Introductionmentioning

confidence: 99%

Optical constants and band structure of trigonal NiO

Ghosh

Nelson

Abdallah

et al. 2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Using spectroscopic ellipsometry and transmission measurements, the authors determined the optical constants (absorption coefficient, complex refractive index, and dielectric function) of bulk trigonal NiO from 0.08 to 6.5 eV. By careful discussion of the data, elastic scattering by oxygen bubbles was ruled out and the effects of surface roughness were removed numerically to obtain an accurate dielectric function of NiO. A direct band gap of 0.85 eV was found from transmission and assigned to direct interband transitions from the Ni-O hybrid valence band states to the Ni 4s conduction band at the center of the Brillouin zone. At 4 eV, the authors find the well-known charge transfer gap from the lower to the upper Hubbard band. Several intermediate sharp peaks were also found. The temperature dependence of the NiO charge transfer gap is similar to the E 1 gap of Si between 100 and 700 K. At higher temperatures, heating NiO in vacuum leads to sublimation, which has drastic irreversible consequences for the pseudodielectric function of the sample, including a strong Ni nanoparticle plasmon peak at 2 eV. V

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Oxides of the Metals Fe, Co, Ni, Cu, and Homologues

Suchet

1971

Crystal Chemistry and Semiconduction in Transition Metal Binary Compounds

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Infrared Absorption of NiO

Cited by 14 publications

References 4 publications

Influence of diamagnetic impurity on mid‐IR absorption in antiferromagnetic insulator NiO

Influence of diamagnetic impurity on mid‐IR absorption in antiferromagnetic insulator NiO

Optical constants and band structure of trigonal NiO

Oxides of the Metals Fe, Co, Ni, Cu, and Homologues

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