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Effect of Bound Water on the Fractal Geometry of Nanosized Cracks in Glasses Prepared by Vacuum Pressure-Assisted Sintering
Pleiades Publishing Ltd - - 2001
The vibrational properties of fractal nanocracks in vitreous SiO2samples
prepared by vacuum pressure-assisted sintering are investigated by low-frequency
Raman scattering spectroscopy. In the Raman spectrum, nanosized discontinuities
with a fractal geometry manifest themselves in a specific frequency dependence
of the scattering intensity: a monotonic decrease in the intensity according to
the law...
Microwave Dehydration of Borax: Characterization, Dehydration Kinetics, and Modelling
Pleiades Publishing Ltd - Tập 48 - Trang 210-218 - 2022
In the present study, borax (Na2B4O7·10H2O) was dehydrated using microwave
radiation and the dehydration rate curves were calculated. The kinetic
parameters and mathematical constants of several drying models were calculated
from the dehydration curve data. The best model was selected using the
statistical analyses of R2, χ2, and root mean square error. From the best model,
the kinetic parameters ...
Identification of photoluminescence centers in oxygen- and erbium-doped a-Si(H) films
Pleiades Publishing Ltd - Tập 37 - Trang 406-410 - 2011
It has been shown that [Er-O] clusters play the role of photoluminescence
centers in films of amorphous hydrogenated silicon a-Si(H) doped with oxygen and
erbium. The local symmetry of Er3+ ions in clusters is the same as that in
Er2O3. A decrease in the cluster size and an increase in the particle density
result in the enhancement of the photoluminescence intensity of a-Si(H): Er at a
wavelength ...
Synthesis and Research of the Properties of Lanthanum and Neodymium Indates
Pleiades Publishing Ltd - Tập 46 - Trang 434-439 - 2020
Single-phase nanocrystalline (18–20 nm) lanthanum indate powder (LaInO3) and
neodymium indate powder (NdInO3) with the structure of orthorhombic perovskite
are synthesized by the coprecipitation of hydroxides with the simultaneous
ultrasonic treatment of the precipitation and subsequent firing of the
powder-precursors at a temperature of 700°C. Ceramic samples with an open
porosity of 4 to 5% are ...
Effects of Different Quenching Rate on the Various Properties of Fe–Si–B Amorphous Alloy Prepared by Melt Spinning Method
Pleiades Publishing Ltd - Tập 49 - Trang 617-624 - 2023
In this work an attempt is made to study the impact of the quenching rate upon
structure, hyperfine interactions, magnetic and mechanical properties of
Fe78Si9B13 metallic glasses. Other involved parameters in melt spinning method
were kept invariant. Analytical techniques comprising X-ray diffraction,
transmission Mössbauer spectrometry, vibration sample magnetometer, Vickers
microhardness and di...
Photon interaction parameters for some ZnO–Al2O3–Fe2O3–P2O5 glasses
Pleiades Publishing Ltd - Tập 43 - Trang 227-232 - 2017
Some photon interaction parameters such as mass attenuation coefficient,
effective atomic number, half value layer, mean free path and electron density
for 15ZnO–(17.5–x)Al2O3–xFe2O3–67.5P2O5 glass system (x = 0, 7.5, 12.5, 17.5)
and 15ZnO–(25–x)Al2O3–xFe2O3–60P2O5 glass system (x = 0, 25) have been
investigated in the photon energy range of 1 keV to 100 GeV. It has been
observed that all the phot...
Investigation of nanocomposites based on hydrated calcium phosphates and cellulose Acetobacter xylinum
Pleiades Publishing Ltd - - 2009
Physical and Mechanical Properties of Composite Ceramics in the ZrB2–SiC–MoSi2 System
Pleiades Publishing Ltd - - 2021
Synthesis of nanocomposite materials in the SnO2-NiO system
Pleiades Publishing Ltd - Tập 38 - Trang 131-136 - 2012
The SnO2-NiO nanocomposites with the specific surface area on the order of 100
m2/g and the particle size of both phases of less than 10 nm have been
synthesized by the sol-gel method with the subsequent annealing in the
temperature interval 200–1000°C. It has been shown that, with an increase in the
annealing temperature to 900°C, the specific surface area of the nanocomposites
increases. This ef...
Stabilization of silver nanoparticles and clusters in porous zeolite matrices with Rho, Beta, and paulingite structures
Pleiades Publishing Ltd - Tập 41 - Trang 537-544 - 2015
Silver nanoparticles and clusters (Ag 2 + , Ag 4 + and Ag8) in zeolite matrices
having the structures of paulingite, Rho, and Beta have been obtained using the
method of chemical reduction of silver in the ionic form preliminarily
introduced to the pores of the studied zeolites through ion exchange. The effect
of the ion exchange conditions, surface properties, and porous-textural
characteristics ...
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