Thermal activation of carriers from a metallic impurity band

1993 ◽  
Vol 48 (15) ◽  
pp. 11394-11397 ◽  
Author(s):  
S. Liu ◽  
K. Karrai ◽  
F. Dunmore ◽  
H. D. Drew ◽  
R. Wilson ◽  
...  
Keyword(s):  
Thermal Activation ◽  
Impurity Band ◽  
Metallic Impurity

Observation of a metallic impurity band inn-type GaAs

1990 ◽  
Vol 42 (5) ◽  
pp. 3179-3182 ◽  
Author(s):  
D. Romero ◽  
S. Liu ◽  
H. D. Drew ◽  
K. Ploog
Keyword(s):  
Impurity Band ◽  
Metallic Impurity

Shubnikov–de Haas effect in a metallic impurity band

1992 ◽  
Vol 45 (3) ◽  
pp. 1155-1158 ◽  
Author(s):  
S. Liu ◽  
H. D. Drew ◽  
A. Illiades ◽  
S. Hadjipanteli
Keyword(s):  
Impurity Band ◽  
Metallic Impurity ◽  
Haas Effect

Metallic impurity band in the narrow-band-gap semiconductorn-type InSb

1991 ◽  
Vol 43 (5) ◽  
pp. 4046-4050 ◽  
Author(s):  
J. B. Choi ◽  
S. Liu ◽  
H. D. Drew
Keyword(s):  
Band Gap ◽  
Narrow Band ◽  
Impurity Band ◽  
Metallic Impurity

IMPURITY BAND CONDUCTION STUDY BY PIEZORESISTANCE MEASUREMENTS

1976 ◽  
Vol 37 (C4) ◽  
pp. C4-333-C4-336
Author(s):  
M. AVEROUS ◽  
J. CALAS ◽  
C. FAU
Keyword(s):  
Impurity Band ◽  
Band Conduction

X- ray diffraction and dielectric properties of PbSe thin films

2019 ◽  
Vol 15 (34) ◽  
pp. 1-14
Author(s):  
Bushra A. Hasan
Keyword(s):  
Thin Films ◽  
Thermal Activation ◽  
Thermal Evaporation ◽  
Thermal Activation Energy ◽  
Dielectric Constants ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Glass Substrates

Lead selenide PbSe thin films of different thicknesses (300, 500, and 700 nm) were deposited under vacuum using thermal evaporation method on glass substrates. X-ray diffraction measurements showed that increasing of thickness lead to well crystallize the prepared samples, such that the crystallite size increases while the dislocation density decreases with thickness increasing. A.C conductivity, dielectric constants, and loss tangent are studied as function to thickness, frequency (10kHz-10MHz) and temperatures (293K-493K). The conductivity measurements confirm confirmed that hopping is the mechanism responsible for the conduction process. Increasing of thickness decreases the thermal activation energy estimated from Arhinus equation is found to decrease with thickness increasing. The increase of thickness lead to reduce the polarizability α while the increasing of temperature lead to increase α.

scholarly journals Impurity band conduction in Si-doped β-Ga2O3 films

2021 ◽  
Vol 118 (7) ◽  
pp. 072105
Author(s):  
Anil Kumar Rajapitamahuni ◽  
Laxman Raju Thoutam ◽  
Praneeth Ranga ◽  
Sriram Krishnamoorthy ◽  
Bharat Jalan
Keyword(s):  
Impurity Band ◽  
Si Doped ◽  
Band Conduction

scholarly journals Towards High Efficacy of Pd-Au/C Catalyst for Tetrachloromethane Hydrodechlorination

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 338-359
Author(s):  
Magdalena Bonarowska ◽  
Zbigniew Kaszkur ◽  
Krzysztof Matus ◽  
Alicja Drelinkiewicz ◽  
Tomasz Szumełda ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Gas Phase ◽  
Thermal Activation ◽  
Supported Catalysts ◽  
Carbon Support ◽  
Thermal Reduction ◽  
Microwave Oven ◽  
Optimal Conditions ◽  
Catalyst Activation ◽  
Critical Part

We present an efficient strategy for synthesising the PdAu catalysts with a homogeneous PdAu alloy phase for environmentally important hydrodechlorination of tetrachloromethane in the gas phase. The synthesis of carbon-supported catalysts involved two major steps: (i) incorporation of palladium and gold nanoparticles into carbon support and (ii) activation of the catalysts. The critical part of this work was to find the optimal conditions for both steps. Thus, the incorporation of the nanoparticles was carried out in two ways, by impregnation and direct redox reaction method using acetone solutions of metal precursor salts. The activation was performed either by a conventional thermal reduction in hydrogen or flash irradiation in a microwave oven. The homogeneity and structure of the PdAu alloy were found to depend on the catalyst activation method critically. In all cases, we observed better homogeneity for catalysts that were subject to microwave irradiation. Moreover, the flash microwave irradiation of prepared catalysts provided catalysts of better stability and selectivity towards the desired products (hydrocarbons) in the hydrodechlorination of tetrachloromethane as compared to the catalyst obtained by conventional thermal activation in hydrogen.

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