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- Title
Dielectric and spectroscopic features of ZnO-ZnF-BO:MoO glass ceramic-a possible material for plasma display panels.
- Authors
Naresh, P.; Naga Raju, G.; Reddy, M.; Rao, T.; Kityk, I.; Veeraiah, N.
- Abstract
ZnO-ZnF-BO borate glass mixed with different concentrations of MoO were synthesized and subsequently crystallized. The X-ray diffraction studies revealed that the samples were embedded with crystalline phases in which molybdenum ions exist in Mo and Mo states. The results of spectroscopic studies (viz., optical absorption and electron spin resonance) have revealed that the there is an increasing proportion of Mo ions with increase in the concentration of MoO in the glass ceramic. The results of photoluminescence spectra have indicated that if the care is taken to minimize Mo ion concentration, these glass ceramics are suitable for light emission in the blue, green and red regions. The analysis of the results of IR spectra have indicated that with increase in the content of MoO there is an increasing degree of disorder in the glass network. The room temperature dielectric constant of these glass ceramics containing even the highest concentration of MoO is always found to be in between 11.5 and 12.4 suggesting that these glass ceramics would be suitable for dielectric layer in plasma display panels (PDP). The dielectric parameters have exhibited relaxation character; the relaxation effects have been attributed to molybdenyl complexes. The observed increase in the electrical conductivity with MoO content is attributed to the contribution of polaronic transfer between Mo ⟷ Mo ions. Additionally, the substantial decrement in jump distance for zinc ions between the two sites in the ceramic network (because of increase in the concentration of dangling bonds) is also found to contribute to the conductivity. The value of dielectric breakdown strength for the studied materials is measured to be in the range of 10.54-12.9 kV/cm which is far greater than the required value for a material to be used as dielectric layer in PDP.
- Subjects
BORATE glass; MOLYBDENUM oxides; GLASS-ceramics; X-ray diffraction measurement; PLASMA displays
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 11, p4902
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2251-1