Band gap variation in manganese phosphate glasses with increasing manganese concentration

Siddiqi, Saadat Anwar; Khan, Rafiullah; Khwaja, Farid A.; Naseem, Shahzad

doi:10.1080/00207218808962838

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…4. Similar results are reported by Siddiqi et al 24,25 in binary manganese phosphate glasses. A plot of the E photo variation for varying molar ratio of ZnO is shown in Fig.…”

Section: Photoconduction Measurementssupporting

confidence: 91%

“…However, a dependence of the band gap value on both the applied electric field and the MnO content in Mn-phosphate glasses has already been reported. 24,25 In a similar study, it was shown that an addition of CdO in MnO-P 2 O 5 glasses gives higher band gap values. 26 In the present investigations, the addition of ZnO has been made to Mnphosphate glasses 24,25 for the measurement of band gaps and to understand the charge transport mechanism.…”

Section: Introductionmentioning

confidence: 88%

“…8,[22][23][24][25][26] Using photoconduction measurements, it was observed that the band gap was electric field-dependent. 8 An addition of ZnO in Cd-phosphate glasses resulted in decreasing the band gap value whereas in another similar study, an addition of V 2 O 5 again in Cd-phosphate did not show any significant change in E photo .…”

Section: Introductionmentioning

confidence: 99%

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The Band Gap Estimation of Zinc Manganese Phosphate Glasses

2008

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Zinc manganese phosphate glasses (ZnO-MnO-P 2 O 5 ) of different compositions are synthesized. The optical band gaps are measured in the UV-VIS region. Photoconduction measurements are also made in the spectral energy range 1.5-6.2 eV. At various applied electric fields, the values of the energy band gaps have been deduced from the spectral dependence curves. Furthermore, the band gaps at zero applied voltage were also obtained for different compositions. The charge transport mechanism in these glasses is studied under the Mott's model.

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“…4. Similar results are reported by Siddiqi et al 24,25 in binary manganese phosphate glasses. A plot of the E photo variation for varying molar ratio of ZnO is shown in Fig.…”

Section: Photoconduction Measurementssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 88%

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The Band Gap Estimation of Zinc Manganese Phosphate Glasses

2008

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“…These results are similar to the published data. 8,9,19 It is well-known that B 2 O 3 is a higher quality glass former than P 2 O 5 . The increasing concentration of high bond strength glass former causes a greater increase in bridging oxygen than the non-bridging oxygen, 18 which alters the structure of zinc phosphate glass.…”

Section: Resultsmentioning

confidence: 99%

EFFECT OF B₂O₃ ON PHYSICAL AND OPTICAL PROPERTIES OF ZINC PHOSPHATE GLASSES

Altaf

Chaudhry

Bhatti³

2006

Mod. Phys. Lett. B

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Zinc-phosphate glasses with the addition of B 2 O 3 were prepared by using the melt quench technique. These glasses had a mol% composition of 30ZnO − xB 2 O 3 -(70 − x)P 2 O 5 . The quantity x had values of 10-40 mol%. The mass density of these glasses was found to be in the range of 2.4912-3.0142 g/cm 3 . The oxygen packing density and molar volume were estimated to lie in the range 192.385-286.026 g-atom/liter and 46.78-31.46 cm 3 respectively. The absorption spectra of these glasses were recorded in the range of 190 to 1100 nm. No sharp edges were found in the optical spectra, which confirms the amorphous nature of these glasses. The optical band gap energies were determined to be in the range of 2.40-3.00 eV. A decreasing behavior in optical band gap energy was seen due to the increasing concentration of B 2 O 3 . The extent of band tailing was worked out from the Urbach plots, which showed an exponential dependence of absorption coefficients on photon energies.

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