Transformation of the semi-transparent into the metallic phase of zirconium nitride compounds by implantation at controlled temperature: the evolution of the optical properties

2000 ◽  
Vol 2 (5) ◽  
pp. 442-448 ◽  
Author(s):  
S Camelio ◽  
T Girardeau ◽  
L Pichon ◽  
A Straboni ◽  
C Fayoux ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metallic Phase ◽  
Zirconium Nitride

Optical properties of non-stoichiometric sputtered zirconium nitride films

2003 ◽  
Vol 211 (1-4) ◽  
pp. 146-155 ◽  
Author(s):  
H.M. Benia ◽  
M. Guemmaz ◽  
G. Schmerber ◽  
A. Mosser ◽  
J.C. Parlebas
Keyword(s):  
Optical Properties ◽  
Zirconium Nitride

Functional Metamaterials Based on Mesoscale Gold Sponges, Particulate Aggregates, and Their Composites with Dielectric Materials

2006 ◽  
Vol 964 ◽  
Author(s):  
Michael Cortie ◽  
Abbas Maaroof ◽  
Geoff B Smith
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Plasmon Resonance ◽  
Composite Structures ◽  
Dielectric Materials ◽  
Continuous Phase ◽  
Metallic Phase ◽  
Dipole Approximation ◽  
Functional Material ◽  
Nanoscale Composites

ABSTRACTThe optical properties of some nanoscale composites may deviate from that expected from a simple law of mixture of their individual components. In these cases the resulting structure can be considered to be a type of “metamaterial”. Here we explore some of the possibilities for nanoscale composite structures comprised of gold and VO2 – the latter being a functional material that undergoes a reversible insulator to metallic phase transition at 68°C. Two microstructures are examined: aggregates of gold nanoparticles surrounded by VO2 as the continuous phase, and its geometric inverse, mesoporous gold sponge with discontinuous VO2 inclusions. A composite, right-angled parallelepiped measuring 40×100×100 nm is taken as representative of the mixture, and calculations of the optical properties performed using the discrete dipole approximation code of Draine and Flatau. The VO2 matrix strongly attenuates the dipole-dipole plasmon resonance of the gold structure, and thermochromic switching of the remaining plasmon resonance occurs

scholarly journals Zirconium Nitride: Optical Properties of an Emerging Intermetallic for Plasmonic Applications

2021 ◽  
pp. 2100178
Author(s):  
Alireza Shabani ◽  
Matiyas Tsegay Korsa ◽  
Søren Petersen ◽  
Mehdi Khazaei Nezhad ◽  
Yogendra Kumar Mishra ◽  
...  
Keyword(s):  
Optical Properties ◽  
Zirconium Nitride

Optical Properties of Vanadium Dioxide Film during Semiconductive–Metallic Phase Transition

2007 ◽  
Vol 46 (No. 5) ◽  
pp. L113-L116 ◽  
Author(s):  
Hiroshi Kakiuchida ◽  
Ping Jin ◽  
Setsuo Nakao ◽  
Masato Tazawa
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Vanadium Dioxide ◽  
Metallic Phase ◽  
Vanadium Dioxide Film ◽  
Dioxide Film

Optical Properties of the Half-Metallic La3/4Ca1/4MnO3

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3359-3364
Author(s):  
D. Bagayoko ◽  
G. L. Zhao ◽  
J. D. Fan ◽  
J. T. Wang
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Optical Conductivity ◽  
Local Density ◽  
Metallic Phase ◽  
Ferromagnetic Phase ◽  
Metallic State ◽  
Average Magnetic Moment ◽  
Half Metallic ◽  
Experimental Values

We studied the electronic structure and optical properties of the low temperature (T = 0 K for the calculation) ferromagnetic phase of La3/4Ca1/4MnO3 using a self-consistent ab-initio LCAO method. We employed a local density potential. The calculated electronic structure suggests that the material is in a half-metallic state. The calculated average magnetic moment for the half-metallic phase is 3.75 μ B per Mn. This value is very close to the experimental values of 3.7 μ B per Mn. The real part of the optical conductivity, σ1(ω), from the direct band transitions, is predicted. The calculated optical conductivity shows that for photon energies below 2.4 eV, the electronic states of minority spin do not contribute to the optical transitions.

Electronic structure and optical properties of CsSnI3−yBry (y = 0, 1, 2, 3) perovskites

2019 ◽  
Vol 33 (04) ◽  
pp. 1950003 ◽  
Author(s):  
R. Padmavathy ◽  
A. Amudhavalli ◽  
R. Rajeswarapalanichamy ◽  
K. Iyakutti
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Density Functional ◽  
Energy Gap ◽  
Phonon Dispersion ◽  
Bromine Atom ◽  
Low Cost ◽  
Normal Pressure ◽  
Metallic Phase ◽  
Halide Perovskites

The halide perovskites-based solar cells have been attractive due to their excellent power conversion efficiency and low cost. The structural, electronic and optical properties of Sn-based cesium halide perovskites CsSnI[Formula: see text]Br[Formula: see text] (y = 0, 1, 2, 3) are investigated based on density functional theory. The computed electronic structure profile of CsSnI[Formula: see text]Br[Formula: see text] (y = 0, 1, 2, 3) reveals that these materials exhibit semiconducting behavior at normal pressure. The energy gap of CsSnI3 is tuned by the substitution of bromine atom for iodine atom. Also, it is found that the energy gap values of these materials decrease with increase in pressure and a semiconductor to metallic phase transition is observed at high pressure. The optical properties of these Sn-based halide perovskite compounds against the incident photon energy radiation indicate that these materials can be effective candidates for solar cell applications. The dynamical stability of these perovskites is analyzed by phonon dispersion curve.

scholarly journals 5. Asteroid Infrared Reflectances and Compositional Implications

1977 ◽  
Vol 39 ◽  
pp. 229-241
Author(s):  
D. L. Matson ◽  
T. V. Johnson ◽  
G. J. Veeder
Keyword(s):  
Optical Properties ◽  
Metallic Phase ◽  
The State ◽  
Reflectance Spectra ◽  
Space Weathering ◽  
Infrared Reflectance ◽  
Reflectance Measurements

This paper assesses the state of asteroid infrared reflectance measurements and discusses what they have contributed to our understanding of asteroidal surfaces. The data suggest that space weathering has not significantly affected the optical properties of the asteroids. Thus comparisons of asteroid reflectance spectra with unweathered meteorite and rock data is a valid procedure. The high 1.6 and 2.2 μm reflectances of a number of asteroids strongly suggest the presence of a metallic phase.

Electrical transport and optical properties of zirconium nitride/aluminum nitride multilayers

1991 ◽  
Vol 69 (2) ◽  
pp. 846-849 ◽  
Author(s):  
W. J. Meng ◽  
D. T. Morelli ◽  
D. M. Roessler ◽  
J. Heremans
Keyword(s):  
Optical Properties ◽  
Aluminum Nitride ◽  
Electrical Transport ◽  
Zirconium Nitride

Electronic and Optical Properties of Cubic Perovskites CsPbCl3−yIy (y = 0, 1, 2, 3)

2019 ◽  
Vol 74 (10) ◽  
pp. 905-913 ◽  
Author(s):  
R. Padmavathy ◽  
A. Amudhavalli ◽  
R. Rajeswarapalanichamy ◽  
K. Iyakutti
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Density Functional ◽  
Energy Gap ◽  
Phonon Dispersion ◽  
Low Cost ◽  
Normal Pressure ◽  
Metallic Phase ◽  
Halide Perovskites ◽  
Gap Values

AbstractLead-based halide perovskites are attractive substrates for solar cells because of their excellent power conversion efficiency and low cost. The ground-state properties, electronic structure, as well as optical and phonon properties of lead-based halide perovskites (CsPbCl3−yIy (y = 0, 1, 2, 3) are investigated by first-principles calculations based on density functional theory. Their electronic structure indicates that CsPbCl3−y Iy (y = 0, 1, 2, 3) compounds exhibit semiconducting behaviour at normal pressure. The energy gap of CsPbCl3 can be tuned by substituting iodine atoms for chlorine atoms. The energy gap values are found to be 3.06, 2.681, 2.330, and 2.030 eV using HSE06 calculations for CsPbCl3, CsPbCl2I, CsPbClI2, and CsPbI3, respectively. Also, it is found that the energy gap values of these materials decrease with increase in pressure and that a semiconductor-to-metallic phase transition is observed at high pressure. The optical properties of these Pb-based compounds are analysed. The dynamical stability of these perovskites is analysed by their phonon dispersion curves.

Ab initio study of the structural and optoelectronic properties of the half-Heusler CoCrZ (Z = Al, Ga)

2014 ◽  
Vol 92 (10) ◽  
pp. 1105-1112 ◽  
Author(s):  
A. Missoum ◽  
T. Seddik ◽  
G. Murtaza ◽  
R. Khenata ◽  
A. Bouhemadou ◽  
...  
Keyword(s):  
Optical Properties ◽  
Fermi Level ◽  
Ab Initio ◽  
Metallic Phase ◽  
Full Potential ◽  
Generalized Gradient ◽  
Band Structures ◽  
Electronic Density ◽  
Electronic Band ◽  
Densities Of States

To study the structural, electronic, and optical properties of the half-Heusler CoCrZ (Z = Al, Ga), we have performed ab initio calculations using the full-potential with the mixed basis (APW + lo) method within the generalized gradient approximation. The structural properties as well as the band structures, and total and atomic projected densities of states are computed. From electronic band structures we have found that both compounds have a semimetallic nature. We also studied the evolution of electronic structure of CoCrAl under external hydrostatic pressure. It is found that the pseudo gap around the Fermi level increases continuously with increasing pressure, while the electronic density of states at the Fermi level does not change significantly. Furthermore, the optical properties, such as the dielectric function and refractive index were evaluated and discussed under pressure up to 20 GPa, and the electrical conductivity and electron energy loss were calculated for radiation up to 30 eV. The same way, we have studied the magnetic properties of CoCrAl for lattice expansion up to a = 1.1a0 where a transition from the paramagnetic phase to the half-metallic phase is expected.

Sign in / Sign up

Export Citation Format

Share Document