Properties and structure of copper ultraphosphate glasses

Metwalli, Ezzeldin; Karabulut, Mevlüt; Sidebottom, David L.; Morsi, Morsi M.; Brow, Richard K.

doi:10.1016/j.jnoncrysol.2004.07.058

Cited by 113 publications

(62 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As compared to the borosilicate glasses, the phosphate glasses remain amorphous even after accommodating higher concentrations of transition ions [5]. In addition to this, the phosphate glasses also possess high electrical conductivity and thermal expansion coefficient [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, the phosphate glasses also possess high electrical conductivity and thermal expansion coefficient [6,7]. Amorphous phosphate has ultraphosphate structure, which gets converted to metaphosphate structure with the introduction of network modifiers [5]. P 2 O 5 , SiO 2 and B 2 O 3 act as basic glass formers whereas oxides like ZnO, BaO, CaO, SrO, Na 2 O and K 2 O etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of P2O5 on optical parameters of (25−x) CaO–xP2O5–B2O3–SiO2–ZnO sol–gel glasses: a theoretical assessment

Kaur

Pickrell

Sriranganathan

2015

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

The present investigation is an attempt to address the effect of P 2 O 5 on the optical properties, cross link density (n c ) as well as theoretical parameters like Poisson's ratio and bulk modulus for (25-x)%CaO-x%P 2 O 5 -60%SiO 2 -5%B 2 O 3 -10%ZnO (x = 5, 10, 15, 20) novel sol-gel glasses. The optical basicity, oxide polarisability, direct/indirect band gaps and theoretical elastic constants have been calculated for all the glasses. In addition to this, the cross-link density, average force stretching constant and number of network bonds per unit volume (n b ) have been calculated. The values of optical basicity and polarisabilty have allowed the same trend for all these glasses. The cross-link density decreases when the P 2 O 5 content increases from 5 to 20 %. Graphical Abstract0 0.5 1 1.5 2 2.5 3 3.5 4 CP5 CP10 CP15 CP20 Indirect /direct band gap and Urbach energy (in eV) Glass samples Eg(Ind) Eg(Dir) EuIndirect/Direct band gap and Urbach energy for all the samples.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of P2O5 on optical parameters of (25−x) CaO–xP2O5–B2O3–SiO2–ZnO sol–gel glasses: a theoretical assessment

Kaur

Pickrell

Sriranganathan

2015

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

show abstract

“…It was found that addition of increasing amount of CuO at the cost of NaO and P 2 O 5 in structure of glasses from (50-x/2)Na 2 O-xCuO-(50-x/2)P 2 O 5 system, where x is less than 34 mol% [1], as well as glasses from P 2 O 5 -Na 2 O-CuO system [3] caused increase of the glass transition temperature T g due to depolimeryzation of the glass network on smaller units which in turn combined by P-O-Cu bonds and resulted in an increase of crosslinking density of the glasses. According to the literature the ratio of Cu 2? ions to total amount of copper ions in the structure of glasses from 50P 2 O 5 -20Na 2 O-30CuO [2] and xCuO-(1-x)P 2 O 5 (0 B x C 0.50) [7] systems had impact on their T g . The higher the ratio, the higher value of T g of these glasses.…”

Section: Introductionmentioning

confidence: 99%

Effect of copper addition on glass transition of silicate–phosphate glasses

Sułowska

Wacławska

Szumera

2012

J Therm Anal Calorim

View full text Add to dashboard Cite

Glass transformation effect of mixed SiO 2 -P 2 O 5 -K 2 O-MgO-CaO-CuO glasses was studied by DSC, XRD, SEM, and Raman spectroscopy methods. The relationship between the parameters characterizing glass transformation effect and an amount of phosphorous and copper forming the glassy structure was discussed. It was shown that an increasing content of phosphorous increased solubility of copper in the structure of the studied glasses which was the result of P-O-Cu bonds formation. Degree of changes of T g , Dc p , and time of relaxation values were higher in glasses with higher content of P 2 O 5 and CuO. The observed relations were explained on the basis of the local atomic interactions in the structure of glass.

show abstract

“…The Q 2 tetrahedra link to form long chains (or rings). Phosphate glasses based on pyrophosphate (Q 1 ) and orthophosphate (Q 0 ) are also possible [37]. Van Wazer developed relationships that describe the compositional dependencies of the tetrahedral site distributions in binary alkali phosphate glasses [38].…”

Section: Infrared Spectramentioning

confidence: 99%

Optical, physical and structural studies of vanadium doped P2O5–BaO–Li2O glasses

Lakshmikantha

Ayachit

Anavekar

2014

Journal of Physics and Chemistry of Solids

View full text Add to dashboard Cite

a b s t r a c tGlasses in the compositions (Li 2 O) 25 -(BaO) 25 -(P 2 O 5 ) 50 À x -(V 2 O 5 ) x (with x ¼0.5,1.0,1.5,2.0,2.5, and 3.0 mol %) have been prepared by the conventional melt quenching technique. X-ray powder diffractrogram show broad peaks which conforms glassy nature of the sample. Differential scanning calorimetry (DSC) thermograms show characteristic glass transition temperature (T g ) and it increases with increasing substitution of V 2 O 5 for P 2 O 5 . The measured physical parameters like density, refractive index, ionic concentration and electronic polarizability are found to vary linearly with increasing x. Infrared spectra exhibits few bands, which are attributed to (P ¼O) AS , (P¼ O) S , (V¼O), (P-O-P) AS ,P-O-V, (P-O-P) AS and O-P-O vibrations. The optical absorption spectra of VO 2 þ ions in these glasses show three bands and are assigned to the 2 B 2 -2 E, 2 B 2 -2 B 1 and 2 B 2 -2 A 1 transitions. Electron paramagnetic resonance spectra of all the glass samples exhibit resonance signals characteristic of VO 2 þ ions. The values of SpinHamiltonian parameters indicate that the VO 2 þ ions are present in octahedral sites with tetragonal compression and belong to C 4V symmetry.

show abstract

Properties and structure of copper ultraphosphate glasses

Cited by 113 publications

References 36 publications

Effect of P2O5 on optical parameters of (25−x) CaO–xP2O5–B2O3–SiO2–ZnO sol–gel glasses: a theoretical assessment

Effect of P2O5 on optical parameters of (25−x) CaO–xP2O5–B2O3–SiO2–ZnO sol–gel glasses: a theoretical assessment

Effect of copper addition on glass transition of silicate–phosphate glasses

Optical, physical and structural studies of vanadium doped P2O5–BaO–Li2O glasses

Contact Info

Product

Resources

About