Preparation and Characterization of TeO2 Based Glasses

2005 ◽  
Vol 480-481 ◽  
pp. 315-322 ◽  
Author(s):  
J. Pedlíková ◽  
J. Zavadil ◽  
Olga Prochazková ◽  
J. Kaluzny
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Low Temperature ◽  
Absorption Edge ◽  
Electronic Transitions ◽  
Transmission Range ◽  
Dc Electrical Conductivity ◽  
Pacs Codes ◽  
Low Temperature Photoluminescence

Binary and ternary TeO2 based oxy-chloride glass systems have been prepared and characterised by absorption and low-temperature photoluminescence spectroscopy, and by the measurements of dc electrical conductivity. Prepared glasses exhibit transmittance 75-80% in a broad transmission range 0.3 – 6.5µm with modest shift of upper absorption edge to longer wavelength as heavier ions are introduced into the system. Electronic transitions between 4f-4f inner shells of Pr3+ ions embedded into the host glass have been investigated in a wide temperature range as a function of used precursors used for doping. The temperature dependence of dc electrical conductivity exhibits Arrhenius plots with the single activation energy. PACS codes 81.05.Kf, 78.20.Ci, 78.55.Hx

Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

1990 ◽  
Vol 55 (12) ◽  
pp. 2933-2939 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Klaus Richau
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Cellulose Acetate Membrane ◽  
Structure Parameters ◽  
Dc Electrical Conductivity ◽  
Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

Low temperature photoluminescence properties of CsPbBr3 quantum dots embedded in glasses

2017 ◽  
Vol 19 (26) ◽  
pp. 17349-17355 ◽  
Author(s):  
Bing Ai ◽  
Chao Liu ◽  
Zhao Deng ◽  
Jing Wang ◽  
Jianjun Han ◽  
...  
Keyword(s):  
Activation Energy ◽  
Quantum Dots ◽  
Thermal Expansion ◽  
Low Temperature ◽  
Size Dependence ◽  
Phonon Coupling ◽  
Photoluminescence Properties ◽  
Electron Phonon Coupling ◽  
Cspbbr3 Quantum Dots ◽  
Low Temperature Photoluminescence

Size dependence of exciton activation energy, electron–phonon coupling strength, and thermal expansion of the bandgap of CsPbBr3 QDs were studied.

Structural Characterization of MBE Grown (001) CdTe Films by Means of Transmission Electron Microscopy, Low Temperature Photoluminescence and Double Crystal Rocking Curves.

1986 ◽  
Vol 77 ◽  
Author(s):  
M. G. Burke ◽  
W. J. Choyke ◽  
N. J. Doyle ◽  
Z. C. Feng ◽  
M. H. Hanes ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ion Milling ◽  
Double Crystal ◽  
X Ray ◽  
Transmission Electron ◽  
Line Defects ◽  
Cdte Films ◽  
Means Of Transmission ◽  
Low Temperature Photoluminescence

ABSTRACTThe effects of chemical etching, mechanical thinning, and ion milling on the low temperature photoluminescence spectra of MBE grown (001) CdTe films are reported. Line defects observed by TEM are correlated with photoluminescence. It is shown that X-ray D.C.R.C, measurements in these films are weighted averages over the whole thickness of the films and therefore weakly reflect the structural perfection of the samples near the surface as deduced by photoluminescence.

Electrical and thermal properties of Na2SO4 doped with NaVO3, Ln2(SO4)3 (Ln = Eu, Pr)

1983 ◽  
Vol 61 (7) ◽  
pp. 1557-1561 ◽  
Author(s):  
Nobuhito Imanaka ◽  
Gin-Ya Adachi ◽  
Jiro Shiokawa
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Phase Transformation ◽  
Thermal Properties ◽  
Low Temperature ◽  
Apparent Activation Energy ◽  
Solid Electrolytes ◽  
A Value

In order to develop useful solid electrolytes for SO2 detectors, Na2SO4, Na2SO4–Eu2(SO4)3, Na2SO4–NaVO3, and Na2SO4–NaVO3–Ln2(SO4)3 (Ln = Eu, Pr) systems have been prepared, and their electrical and thermal properties have been measured. By doping Na2SO4 with Eu2(SO4)3, the electrical conductivity increases and the apparent activation energy of the Na2SO4–Eu2(SO4)3 system shows a value between those of Na2SO4-III and Na2SO4-I. Addition of NaVO3 and Ln2(SO4)3 (Ln = Eu, Pr) to Na2SO4 suppressed the phase transformation, by stabilizing the structure of the Na2SO4-I phase even at a relatively low temperature.

scholarly journals INVESTIGATION OF ELECTRICAL CONDUCTION IN VANADATE BASED GLASSES

2013 ◽  
Vol 22 ◽  
pp. 255-260 ◽  
Author(s):  
R. V. BARDE ◽  
S. A. WAGHULEY
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Electrical Conduction ◽  
Arrhenius Equation ◽  
Localized States ◽  
Melt Quenching ◽  
Temperature Range ◽  
Dc Electrical Conductivity ◽  
Glassy Systems

The binary glassy systems 60V2O5-(40-x)P2O5 –xB2O3 were prepared by melt quenching technique. The mole of B2O3 was varies from 5 to 20 mol % with constant mol % of V2O5 during preparation of glass samples. The dc electrical conductivity of samples was measured in temperature range 303-473 K and found to be higher for sample 60 V2O5-20P2O5 –20B2O3 . Using the Arrhenius equation of conductivity, the activation energy of conduction is estimated. The conduction in these glasses is takes place by phonon-assisted hopping between the localized states.

Low-temperature photoluminescence characterization of hydrogen- and helium-implanted silicon

2001 ◽  
Vol 4 (1-3) ◽  
pp. 297-299 ◽  
Author(s):  
A.G. Ulyashin ◽  
R. Job ◽  
W.R. Fahrner ◽  
A.V. Mudryi ◽  
A.I. Patuk ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Photoluminescence

Electrophysical properties of the (SnSe)1−x–(SmSe)x solid solutions at high and low temperature

2019 ◽  
Vol 34 (01) ◽  
pp. 2050008
Author(s):  
V. A. Abdurahmanova ◽  
N. M. Abdullaev ◽  
Sh. S. Ismayilov
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Low Temperature ◽  
Solid Solutions ◽  
Low Temperatures ◽  
Electrophysical Properties ◽  
Type Specimens ◽  
Text Type ◽  
Donor Type ◽  
Text Density

The temperature range of [Formula: see text] = 77–770 K in the system alloys: Holl coefficient [Formula: see text], thermo-emf [Formula: see text], electric conductivity [Formula: see text], measured [Formula: see text]-density of components and analyzed. It has been established that samarium additive atoms contain donor-type properties and the effectiveness increases with the temperature increase: up to 40% proportional to [Formula: see text] K in [Formula: see text]-type specimens, whereas in [Formula: see text]-type samples this increase is higher and covers the contents of pH varying from [Formula: see text] to [Formula: see text]. An electrical conductivity of compounds increased due to the carrier activation with further increase of temperature. The activation energy of carriers at low temperatures ([Formula: see text] K) is [Formula: see text] eV for [Formula: see text] mol.% and [Formula: see text] mol.% compounds at [Formula: see text] = 77–320 K and for [Formula: see text] mol.% and [Formula: see text] mol.% compounds are [Formula: see text] eV. [Formula: see text] const at [Formula: see text]–400 K for [Formula: see text] mol.% and [Formula: see text] mol.% compounds, and passing with minimum increases at [Formula: see text] = 400–500 K.

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