scholarly journals Assessment of glass-forming ability and the effect of La2O3 on crystallization mechanism of barium–lead–zinc phosphate glasses

2007 ◽  
Vol 61 (3) ◽  
pp. 912-916 ◽  
Author(s):  
Marcio Luis Ferreira Nascimento ◽  
Noelio Oliveira Dantas
Keyword(s):  
Zinc Phosphate ◽  
Glass Forming Ability ◽  
Phosphate Glasses ◽  
Crystallization Mechanism ◽  
Glass Forming ◽  
Lead Zinc

Structural and optical study of samarium doped lead zinc phosphate glasses

2013 ◽  
Vol 300 ◽  
pp. 204-209 ◽  
Author(s):  
M. Reza Dousti ◽  
S.K. Ghoshal ◽  
Raja J. Amjad ◽  
M.R. Sahar ◽  
Fakhra Nawaz ◽  
...  
Keyword(s):  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
Optical Study ◽  
Lead Zinc

scholarly journals Influence of ZrO2 Addition on Structural and Biological Activity of Phosphate Glasses for Bone Regeneration

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4058
Author(s):  
M. Mohan Babu ◽  
P. Syam Prasad ◽  
P. Venkateswara Rao ◽  
S. Hima Bindu ◽  
A. Prasad ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Biological Activity ◽  
Incubation Time ◽  
Sample Surface ◽  
Glass Forming Ability ◽  
Phosphate Glasses ◽  
Bioactive Materials ◽  
Glass Forming ◽  
Before And After ◽  
Thermal Stability Of

Zirconium doped calcium phosphate-based bioglasses are the most prominent bioactive materials for bone and dental repair and regeneration implants. In the present study, a 8ZnO–22Na2O–(24 − x)CaO–46P2O5–xZrO2 (0.1 ≤ x ≤ 0.7, all are in mol%) bioglass system was synthesized by the conventional melt-quenching process at 1100 °C. The glass-forming ability and thermal stability of the glasses were determined by measuring the glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm), using differential thermal analysis (DTA). The biological activity of the prepared samples was identified by analyzing X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy-energy dispersive spectra (SEM-EDS), before and after immersion in simulated body fluid (SBF) for various intervals of 0, 1 and 5 days, along with the magnitude of pH and the degradation of glasses also evaluated. The obtained results revealed that the glass-forming ability and thermal stability of glasses increased with the increase in zirconia mol%. The XRD, FTIR, and SEM-EDS data confirmed a thin hydroxyapatite (HAp) layer over the sample surface after incubation in SBF for 1 and 5 days. Furthermore, the development of layer found to be increased with the increase of incubation time. The degradation of the glasses in SBF increased with incubation time and decreased gradually with the increase content of ZrO2 mol% in the host glass matrix. A sudden rise in initial pH values of residual SBF for 1 day owing to ion leaching and increase of Ca2+ and PO43− ions and then decreased. These findings confirmed the suitability of choosing material for bone-related applications.

Theoretical Studies of the Spin Hamiltonian Parameters and Local Distortions for Cu2+ in Alkaline Earth Lead Zinc Phosphate Glasses

2016 ◽  
Vol 71 (8) ◽  
pp. 769-775 ◽  
Author(s):  
Bo-Kun Wang ◽  
Shao-Yi Wu ◽  
Zi-Yi Yuan ◽  
Zi-Xuan Liu ◽  
Shi-Xin Jiang ◽  
...  
Keyword(s):  
Field Strength ◽  
Crystal Field ◽  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
Spin Hamiltonian ◽  
Local Structures ◽  
Crystal Field Strength ◽  
Lead Zinc ◽  
Hamiltonian Parameters

AbstractThe spin Hamiltonian parameters and local structures are theoretically studied for Cu2+-doped alkaline earth lead zinc phosphate (RPPZ, R=Mg, Ca, Sr, and Ba) glasses based on the high-order perturbation calculations for a tetragonally elongated octahedral 3d9 cluster. The relative elongation ratios are found to be ρ≈3.2%, 4.4%, 4.6%, and 3.3% for R=Mg, Ca, Sr, and Ba, respectively, because of the Jahn-Teller effect. The whole decreasing crystal-field strength Dq and orbital reduction factor k from Mg to Sr are ascribed to the weakening electrostatic coulombic interactions and the increasing probability of productivity of nonbridge oxygen (and hence increasing Cu2+–O2− electron cloud admixtures) under PbO addition, respectively, with increasing alkali earth ionic radius. The anomalies (the largest Dq and the next highest k among the systems) for R=Ba are attributed to the cross linkage of this large cation in the network. The overall increasing order (Mg≤Ba<Ca<Sr) of ρ is largely due to the decreasing crystal-field strength Dq and hence the decreasing force constant of the Cu2+–O2− bonds. The present studies would be helpful to understand local structures and the influences on the optical properties of RPPZ glasses containing copper dopants.

Structural properties of Er3+ doped lead zinc phosphate glasses

2019 ◽  
Vol 240 ◽  
pp. 116-120 ◽  
Author(s):  
Swarup Chowdhury ◽  
Pabitra Mandal ◽  
Subhankar Ghosh
Keyword(s):  
Structural Properties ◽  
Zinc Phosphate ◽  
Phosphate Glasses ◽  
Lead Zinc

Spectroscopic studies of chromium doped alkali earth lead zinc phosphate glasses

2014 ◽  
Vol 89 (1) ◽  
pp. 73-80 ◽  
Author(s):  
S. S. Sastry ◽  
B. R. Venkateswara Rao ◽  
T. Vishwam
Keyword(s):  
Zinc Phosphate ◽  
Spectroscopic Studies ◽  
Phosphate Glasses ◽  
Alkali Earth ◽  
Lead Zinc
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