Temperature dependence of the optical properties in p-Cd0.96Zn0.04Te single crystals

Photoluminescence (PL) measurements were performed on p-Cd0.96Zn0.04Te single crystals to investigate the dependence of the excitons on temperature. The activation energies and the longitudinal acoustic parameters of the excitons were determined from the temperature dependence of the PL spectra and were in reasonable agreement with the theoretical calculations. These results can help improve understanding for the application of p-CdxZn1–xTe single crystals in optoelectronic devices.

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Motion of the SO3−NH radical trapped in potassium sulfamate. Electron spin resonance dipolar coupling tensors for the motionless radical

Canadian Journal of Chemistry ◽

10.1139/v77-355 ◽

1977 ◽

Vol 55 (13) ◽

pp. 2570-2574 ◽

Cited By ~ 6

Author(s):

L. Bonazzola ◽

J. P. Michaut ◽

J. Roncin

Keyword(s):

Electron Spin Resonance ◽

Temperature Dependence ◽

Single Crystals ◽

Electron Spin ◽

Dipolar Coupling ◽

Theoretical Calculations ◽

Spin Resonance ◽

The Matrix

The temperature dependence of the esr couplings in SO3−NH radical trapped in potassium sulfamate single crystals allows the study of the motion of this radical in the matrix and the determination of N and H dipolar tensors corresponding to the motionless radical. These values are compared with different theoretical calculations.

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Zur Diffusion von Xenon in neutronenbestrahlten Cs-Halogeniden

Zeitschrift für Naturforschung A ◽

10.1515/zna-1967-1234 ◽

1967 ◽

Vol 22 (12) ◽

pp. 2075-2077 ◽

Cited By ~ 1

Author(s):

F. W. Felix ◽

K. Meier

Keyword(s):

Temperature Dependence ◽

Single Crystals ◽

Diffusion Coefficients ◽

Volume Diffusion ◽

Activation Energies ◽

Neutron Dose ◽

Xenon 133

The release of Xenon-133 m and Xe-133 from neutron-irradiated single crystals of Cs-halides was measured in function of temperature and neutron dose. This release could be expressed in terms of volume diffusion. The temperature dependence in CsF, CsBr and CsI can be described by the activation energies ≦ 2, 1.45 and 1.14 eV and the frequency factors ≦ 1 × 102, 1 × 102 and 2.0 cm2/sec in the temperature regions 450—600, 260—580 and 200—500°C respectively. Increasing neutron doses decrease diffusion coefficients in CsBr and CsI.

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Theoretical Framework of 1,3-Thiazolium-5-Thiolates Mesoionic Compounds: Exploring the Nature of Photophysical Properties and Molecular Nonlinearity

10.26434/chemrxiv.12063261 ◽

2020 ◽

Author(s):

Zeyu Liu ◽

Shugui Hua ◽

Tian Lu ◽

Ziqi Tian

Keyword(s):

Optical Properties ◽

Rational Design ◽

Rayleigh Scattering ◽

Function Analysis ◽

Theoretical Calculations ◽

Photophysical Properties ◽

Optical Nonlinearity ◽

Nonlinear Properties ◽

Photoelectric Performance ◽

Wave Function Analysis

Inspired by a previous experimental study on the first-order hyperpolarizabilities of 1,3-thiazolium-5-thiolates mesoionic compounds using Hyper-Rayleigh scattering technique, we theoretically investigated the UV-Vis absorption spectra and every order polarizabilities of these mesoionic molecules. Based on the fact that the photophysical and nonlinear properties observed in the experiment can be perfectly replicated, our theoretical calculations explored the essential characteristics of the optical properties of the mesoionic compounds with different electron-donating groups at the level of electronic structures through various wave function analysis methods. The influence of the electron-donating ability of the donor on the optical properties of the molecules and the contribution of the mesoionic ring moiety to their optical nonlinearity are clarified, which have not been reported by any research so far. This work will help people understand the nature of optical properties of mesoionic-based molecules and provide guidance for the rational design of molecules with excellent photoelectric performance in the future.

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Studies on the Temperature Stability of Pure and Doped Triglycine Sulphate Crystals Using TGA/DTA

Current Physical Chemistry ◽

10.2174/1877946810666200212094533 ◽

2020 ◽

Vol 10 (3) ◽

pp. 206-212

Author(s):

Vijeesh Padmanabhan ◽

Maneesha P. Madhu ◽

Supriya M. Hariharan

Keyword(s):

Thermal Analysis ◽

Temperature Dependence ◽

Single Crystals ◽

Temperature Stability ◽

Bandgap Energy ◽

Dsc Analysis ◽

Slow Cooling ◽

As Doping ◽

Similar Dependence ◽

Temperature Ranges

Aim: To study the temperature stability of TGS doped with ZnSO4, CdCl2, BaCl2, and compare it with that of pure TGS. Objectives: Synthesizing pure and doped TGS and studying their temperature dependence using TGA, DTA, and DSC analysis. Methods: Slow cooling solution growth was used to grow single crystals of pure and doped TGS. The TGA, DTA and DSC analysis was conducted for determining the temperature stability. Results: The thermal analysis of pure and doped TGS shows that the doped samples show a similar dependence on temperature as pure TGS. The temperature of decomposition of pure and doped samples (BTGS, ZTGS, CdTGS) was 226.60°C, 228.38°C, 229.13°C, and 239.13°C respectively. The melting onset of these samples was 214.51°C, 216.04°C, 217.69°C and 216.04°C respectively. Conclusion: The study shows that doping TGS with the above three described materials did not alter their temperature stability considerably. It is a good result as doping TGS, for varying its characteristics like absorbance, reflectance, bandgap energy, etc., which did not alter its temperature stability. Therefore, TGS doped with the above three dopants can be used at the same temperature ranges as of pure TGS but with much-improved efficiency.

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