scholarly journals Density and molar volume studies of phosphate glasses

2011 ◽  
Vol 9 (1) ◽  
pp. 29-36 ◽  
Author(s):  
U.B. Chanshetti ◽  
V.A. Shelke ◽  
S.M. Jadhav ◽  
S.G. Shankarwar ◽  
T.K. Chondhekar ◽  
...  
Keyword(s):  
Molar Volume ◽  
Phosphate Glasses ◽  
Sodium Oxide ◽  
Oxide Content ◽  
Ionic Radii ◽  
Field Strengths

The density and molar volume of some phosphate glasses (xNa2O?(100-x)P2O5, x = 30, 35, 40, 45, 50); xB2O3?(1-x)NaPO3, x = 5, 10, 15, 20, 25; xNa2O?(30-x) K2O?10Al2O3? 25B2O3?35P2O5, x= 5, 10, 15, 20, 25) glasses were determined, in order to study their structure. The density of the glasses increased while their molar volume values decreases with the increase of sodium oxide content in phosphate glasses. The results obtained could be correlated to several factors such as the polarization, the field strengths and the ionic radii of the different incorporated cations.

Preparation and Properties of La2O3-CaO-P2O5 Glasses Doped with Eu3+ Ions

2016 ◽  
Vol 675-676 ◽  
pp. 376-379 ◽  
Author(s):  
Narun Luewarasirikul ◽  
Piyachat Meejitpaisan ◽  
Jakrapong Kaewkhao
Keyword(s):  
Calcium Phosphate ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Emission Spectra ◽  
Phosphate Glasses ◽  
Excitation Wavelength ◽  
Melt Quenching ◽  
Volume Measurements ◽  
Doped Glasses

Lanthanum calcium phosphate glasses doped with Eu3+ ions in compositions 20La2O3:10CaO:(70-x)P2O5:xEu2O3 (where x = 0.05, 0.10, 0.50 and 1.50 mol%) were prepared by melt-quenching technique. The density and molar volume measurements were carried out at room temperature. The absorption spectra were investigated in the UV-Vis-NIR region from 200 to 2500 nm. The emission spectra of Eu3+-doped glasses centered at 590 nm (5D0→7F1), 612 nm (5D0→7F2), 652 nm (5D0→7F3) and 699 nm (5D0→7F4) have been observed with 393 nm excitation wavelength.

scholarly journals Effect of Sodium Oxide and Sodium Fluoride in Gadolinium Phosphate Glasses Doped with Eu2O3 Content

2020 ◽  
Vol 1428 ◽  
pp. 012029
Author(s):  
S. Ravangvong ◽  
R. Rajaramakrishna ◽  
N. Chanthima ◽  
N. Sangwaranatee ◽  
J. Kaewkhao
Keyword(s):  
Sodium Fluoride ◽  
Phosphate Glasses ◽  
Sodium Oxide

The Polarizability and Optical Characteristics of Zinc Phosphate Glasses Doped Terbium Embedded with Copper Oxide Nanoparticles

2019 ◽  
Vol 290 ◽  
pp. 35-40 ◽  
Author(s):  
Syariffah Nurathirah S. Yaacob ◽  
M.R. Sahar ◽  
E.S. Sazali ◽  
S. Sulhadi
Keyword(s):  
Refractive Index ◽  
Molar Volume ◽  
Zinc Phosphate ◽  
Glass Network ◽  
High Refractive Index ◽  
Copper Oxide Nanoparticles ◽  
Phosphate Glasses ◽  
X Ray Diffraction ◽  
Cuo Nps ◽  
Vis Spectroscopy

Tuning the concentration of nanoparticles (NPs) to accommodate wider application demanded a better understanding of the physicals and structural properties of the glass. A series of zinc phosphate glasses with the composition of (57-x) P2O5- 40ZnO-3Tb2O3 –xCuO, (0 ≤ x ≤ 2 mol %) has been prepared by melt quenching technique and their physical and optical characterization have been studied. The X-Ray Diffraction technique and UV-Vis Spectroscopy have been used to characterize the glass sample. The XRD confirms the amorphous nature of the prepared glasses. The physical properties of glasses with different CuO NPs such as density, molar volume, refractive index and electronic polarizability are determined. It is found that both density and molar volume decreases with increasing CuO NPs concentration. The optical band gap (4.54 eV-2.96 eV) and the Urbach energy (0.19 eV-0.54 eV) are showing a decreasing trend with the increasing amount of CuO NPs.This is due to the formation of non-bridging oxygen, (NBO) in the glass network. The glass exhibits high refractive index ~2.40 and polarizability ~1.12 ×10-23 cm3 and is useful for solid-state laser and optoelectronic devices.

Optical Absorption of Erbium Doped Zinc Phosphate Glass Containing Fe3O4 Nanoparticles

2015 ◽  
Vol 1107 ◽  
pp. 420-425 ◽  
Author(s):  
Puzi Anigrahawati ◽  
M.R. Sahar ◽  
Md Supar Rohani ◽  
Sib Krishna Ghoshal
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Molar Volume ◽  
Urbach Energy ◽  
Phosphate Glasses ◽  
Zinc Phosphate Glass ◽  
Erbium Doped ◽  
Quenching Method ◽  
Average Size

Modifying the optical properties of rare earth doped phosphate glasses in a tunable fashion via the embedment of magnetic nanoparticles (NPs) is challenging for magneto-optic devices. Glasses with compositions (69-x)P2O5-30ZnO-1Er2O3-(x)Fe3O4, where x = 0 to 1.5 mol% are prepared by conventional melt quenching method. The Fe3O4NPs concentration dependent density, molar volume, refractive index and optical properties are determined. Density and molar volume shows strong correlation with structural alteration in the presence of NPs. The XRD spectra confirm the disordered nature of the glass and TEM micrograph display the presence of spherical NPs with average size ~26 nm. The optical band gap and Urbach energy calculated from the room temperature absorption spectra recorded in the range of 350-1700 nm reveal significant improvement. The density and refractive index increases and the molar volume decreases with the increase of Fe3O4contents. The energy band gap for direct and indirect transitions varies in the range of 4.47-3.64 eV and 4.27-3.53 eV, respectively. The Urbach energy increases from 0.15 to 0.19 eV as the NPs concentration increases from 0 to 1.5 mol%.

scholarly journals Effect of sodium oxide content on the formation of nanogratings in germanate glass by a femtosecond laser

2018 ◽  
Vol 26 (10) ◽  
pp. 12761 ◽  
Author(s):  
Juechen Wang ◽  
Xiaofeng Liu ◽  
Ye Dai ◽  
Zhiyu Wang ◽  
Jianrong Qiu
Keyword(s):  
Femtosecond Laser ◽  
Sodium Oxide ◽  
Oxide Content ◽  
Germanate Glass

PHYSICAL PROPERTIES OF SODIUM CADMIUM PHOSPHATE GLASSES

2011 ◽  
Vol 25 (26) ◽  
pp. 3503-3512 ◽  
Author(s):  
M. ALTAF ◽  
M. A. CHAUDHRY
Keyword(s):  
Transition Temperature ◽  
Physical Properties ◽  
Molar Volume ◽  
Packing Density ◽  
Linear Expansion ◽  
Mass Density ◽  
Softening Temperature ◽  
Phosphate Glasses ◽  
Coefficient Of Linear Expansion ◽  
Cadmium Phosphate

A series of sodium cadmium phosphate glasses was prepared in a platinum crucible by melt quench technique. These glasses contain a mole% composition of x% Na 2 O -(50-x)% CdO -50% P 2 O 5, where the quantity x lies in 0–40 mole%. In this work the physical properties of these glasses were studied, which are reported as mass density ρ, oxygen packing density, molar volume, sodium ion concentration, modulus of rigidity η, coefficient of linear expansion α, transition temperature Tg, and softening temperature Ts. The mass density, oxygen packing density, modulus rigidity, transition temperature and softening temperature show decreasing trend with increasing concentration of sodium ions in these glasses, whereas molar volume and coefficient of linear expansion indicate an increase with increasing concentration of sodium oxide.

Physical and optical properties of calcium sulfate ultra-phosphate glass-doped Er2O3

2018 ◽  
Vol 32 (08) ◽  
pp. 1850084
Author(s):  
Aliyu Mohammed Aliyu ◽  
R. Hussin ◽  
Karim Deraman ◽  
N. E. Ahmad ◽  
Amina M. Danmadami ◽  
...  
Keyword(s):  
Optical Properties ◽  
Molar Volume ◽  
Phosphate Glass ◽  
Calcium Sulfate ◽  
Optical Measurement ◽  
Emission Spectra ◽  
Optical Bandgap ◽  
Oxide Content ◽  
X Ray Diffraction ◽  
Xrd Techniques

The influence of erbium on physical and optical properties of calcium sulfate ultra-phosphate glass was investigated using conventional melt quench process. Selected samples of composition 20CaSO4 (80 – x) P2O5– xEr2O3 with 0.1 [Formula: see text]x [Formula: see text] 0.9 mol.% were prepared and assessed. X-ray diffraction (XRD) techniques were used to confirm the amorphous nature of the said samples. The structural units of phosphate-based glass were assessed from Raman spectra as ultra-(Q3), meta-(Q2), pyro-(Q1) and orthophosphate (Q0) units. Depolymerization process of the glasses was testified for higher calcium oxide content and UV-visible for optical measurement. Thermal analysis have been investigated by means of thermogravimetric analysis. The results show the decomposition of materials in the temperature range of 25[Formula: see text]C–1000[Formula: see text]C. Er[Formula: see text] absorption spectra were measured in the range of 400–1800[Formula: see text]nm. PL measurement was carried out in order to obtain the excitation and emission spectra of the samples. The emission spectra excited at 779[Formula: see text]nm comprises of 518[Formula: see text]nm, 550[Formula: see text]nm and 649[Formula: see text]nm of transition 4F[Formula: see text], 4S[Formula: see text] and 2H[Formula: see text] excited states to 4I[Formula: see text] ground state. In physical properties, the density calculated using Archimedes method is inversely proportional to molar volume with increase in Er[Formula: see text] ions. Optical bandgap (E[Formula: see text]) were determined using Tauc’s plots for direct transitions where E[Formula: see text] (direct) decreases with increase in erbium content. The refractive index increases with decreasing molar volume; this may have a tendency for larger optical bandgap. The result obtained from the glass matrix indicates that erbium oxide-doped calcium sulfate ultra-phosphate may give important information for wider development of functional glasses.

Intermediate Range Order in Sodium Tellurite Glasses

1996 ◽  
Vol 455 ◽  
Author(s):  
J. W. Zwanziger ◽  
J. C. McLaughlin ◽  
S. L. Tagg
Keyword(s):  
Random Model ◽  
Range Order ◽  
Sodium Oxide ◽  
Oxide Content ◽  
Tellurite Glasses ◽  
Sodium Ions ◽  
Distance Distributions ◽  
Sodium Tellurite ◽  
Maximum Stability ◽  
Spin Echoes

ABSTRACTInformation about the spatial distribution of sodium cations in sodium tellurite glasses is obtained from the decay rate of sodium spin echoes. The spin echoes decay due to the magnetic dipole coupling between sodium nuclei, with each pair contributing to the rate in proportion to 1/r6, where r is the distance between the pair. The experiment is used to probe the sodium distributions in sodium tellurite glasses as a function of sodium oxide content, and the resulting distance distributions are interpreted by comparison with model distributions. At low sodium contents the distribution is similar to that of a random model in which the sodium ions are constrained to be no closer than a minimum cut-off distance. At higher contents the distributions deviate significantly from the random model, suggesting the onset of medium range order in the distribution of sodium ions. This order is most pronounced at 20% sodium oxide content, the composition at which this glass has been claimed to have maximum stability against devitrification.

scholarly journals PLASMOCHEMICAL MODIFICATION OF WALL BUILDING MATERIALS

2020 ◽  
pp. 11-18
Author(s):  
Vasiliy Bessmertnyy ◽  
O. Puchka ◽  
Diana Bondarenko ◽  
I. Antropova ◽  
Lyudmila Bragina
Keyword(s):  
Aluminum Oxide ◽  
Phase Transformations ◽  
Liquid Glass ◽  
Building Materials ◽  
Sodium Oxide ◽  
Liquid Sodium ◽  
High Alumina ◽  
Oxide Content ◽  
Layer By Layer ◽  
Decorative Coating

the aim of the work is to study the effect of a high-temperature plasma torch on the processes of phase transformations and layer-by-layer modification of the protective and decorative coating on concrete using as a filler a mixture of quartz sand and hollow glass microspheres. The main tasks included: investigation of the processes of evaporation and thermal diffusion of oxides of plasma-coated coatings; study of phase transformations in the melt and its subsequent crystallization in the process of rapid spontaneous cooling of the fused protective and decorative coating; study of the effect of sodium liquid glass on the processes of polymorphic transformations of alumina and the formation of micro-wicks due to the intense diffusion of sodium oxide; study of operational characteristics of protective and decorative coatings. It was established that the initial phases in the protective-decorative coating are α-Al2O3 and CaO∙6Al2O3 (β-Al2O3), and the liquid sodium glass in the coating leads additionally to the formation of Na2O∙11Al2O3. The top layer of the protective and decorative coating is Na–Ca–Al–Si glass with regions of heterogeneities containing an increased content of sodium oxide. The content of aluminum oxide in the protective and decorative coating based on the battle of high-alumina refractory was 95.1 %. The introduction into the coating composition of sodium liquid glass minimizes the processes of dehydration of the binding component and changes the chemical composition of the protective and decorative coating. Reduction of the aluminum oxide content to 83.0 % affects the microhardness indicators. Microhardness of the concrete surface due to the introduction of liquid glass is reduced from 2510 HV to 887 HV.

Structural and Physical Properties Study of Some Phosphate Glasses Used for Radiation Shielding

2016 ◽  
pp. 3983-3993
Author(s):  
Taghreed Zaghloul Amer
Keyword(s):  
Molar Volume ◽  
Attenuation Coefficient ◽  
Gamma Ray ◽  
Glassy State ◽  
Glass Network ◽  
Mass Attenuation Coefficient ◽  
Radiation Shielding ◽  
Phosphate Glasses ◽  
Ion Density ◽  
Oxygen Ion

Mossbauer Effect (ME) and Infrared (IR) spectroscopes are used to study the structure of some iron-sodium phosphate glasses containing strontium, with composition [(70-x) mol% P2O5. x mol% SrO, 15 mol% Fe2O3.15 mol% Na2O, where x= 3, 6,9,12 and 15]. These glasses can have many interesting applications especially as gamma ray attenuators.The amorphous nature and the glassy state character of these glasses can be confirmed from comparing the experimental and empirical values of both their density and molar volume. It was found that, as SrO was gradually increased the density increased while the molar volume decreased which may be due to the gradual decrease of the number of oxygen ion density in the glass networks.The micro-hardness and magnetic susceptibility are also increased, which can be attributed to the gradual migration of iron from glass network modifier (GNM) to glass network former (GNF) positions, as confirmed by IR and ME results. IR and ME analysis indicated that both ferric and ferrous have tetrahedral and octahedral symmetry respectively and acting as GNF and GNM at different SrO contents. The gradual replacement of P2O5 by SrO force the iron to transfer from GNM to GNF.The gamma-ray mass attenuation coefficient increased with the gradual increase of Sr2+ as heavy metal, while the HVL decreased.  On the other hand the attenuation coefficient decreased with the increase of gamma-ray photon energy. So, these glasses can be used as transparent shielding materials for low gamma-ray energies and to capsulate the radio-active wastes, while the sample containing 15 mol% SrO, exhibits the highest attenuation coefficient.  

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