scholarly journals Spectroscopic characterization of manganese-doped alkaline earth lead zinc phosphate glasses

2015 ◽  
Vol 38 (2) ◽  
pp. 475-482 ◽  
Author(s):  
S SREEHARI SASTRY ◽  
B RUPA VENKATESWARA RAO
Keyword(s):  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Spectroscopic Characterization ◽  
Phosphate Glasses ◽  
Lead Zinc

Spectroscopic studies of copper doped alkaline earth lead zinc phosphate glasses

2014 ◽  
Vol 434 ◽  
pp. 159-164 ◽  
Author(s):  
S. Sreehari Sastry ◽  
B. Rupa Venkateswara Rao
Keyword(s):  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Spectroscopic Studies ◽  
Phosphate Glasses ◽  
Lead Zinc

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 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

All-optical characterization of fs-laser induced refractive index changes in bulk and at the surface of zinc phosphate glasses

2015 ◽  
Author(s):  
J. Hernandez-Rueda ◽  
V. Semenov ◽  
N. Troy ◽  
C. E. Smith ◽  
R. K. Brow ◽  
...  
Keyword(s):  
Refractive Index ◽  
Zinc Phosphate ◽  
Optical Characterization ◽  
Phosphate Glasses ◽  
All Optical ◽  
Fs Laser ◽  
Index Changes

scholarly journals Spectroscopic Characterization of Omeprazole and Its Salts

2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
Tomislav Vrbanec ◽  
Primož Šket ◽  
Franci Merzel ◽  
Matej Smrkolj ◽  
Jože Grdadolnik
Keyword(s):  
Vibrational Spectroscopy ◽  
Alkali Metals ◽  
Alkaline Earth ◽  
Active Pharmaceutical Ingredient ◽  
Spectroscopic Characterization ◽  
Infrared And Raman Spectroscopy ◽  
Acid Environment ◽  
Ph Range ◽  
Spectroscopic Tool

During drug development, it is important to have a suitable crystalline form of the active pharmaceutical ingredient (API). Mostly, the basic options originate in the form of free base, acid, or salt. Substances that are stable only within a certain pH range are a challenge for the formulation. For the prazoles, which are known to be sensitive to degradation in an acid environment, the formulation is stabilized with alkaline additives or with the application of API formulated as basic salts. Therefore, preparation and characterization of basic salts are needed to monitor any possible salinization of free molecules. We synthesized salts of omeprazole from the group of alkali metals (Li, Na, and K) and alkaline earth metals (Mg, Ca). The purpose of the presented work is to demonstrate the applicability of vibrational spectroscopy to discriminate between the OMP and OMP-salt molecules. For this reason, the physicochemical properties of 5 salts were probed using infrared and Raman spectroscopy, NMR, TG, DSC, and theoretical calculation of vibrational frequencies. We found out that vibrational spectroscopy serves as an applicable spectroscopic tool which enables an accurate, quick, and nondestructive way to determine the characteristic of OMP and its salts.

Viscosity and kinetic fragility of alkaline earth zinc phosphate glasses

2012 ◽  
Vol 358 (12-13) ◽  
pp. 1480-1485 ◽  
Author(s):  
S. Striepe ◽  
J. Deubener
Keyword(s):  
Alkaline Earth ◽  
Zinc Phosphate ◽  
Phosphate Glasses

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
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