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Influence of V2O5 and B2O3 addition on the sintering behaviour and physical properties of ZnO ceramics

The effect of V2O5 and B2O3 additions on sintering behaviour and physical
 properties of ZnO ceramics was investigated. XRD studies revealed ZnO as
 main phase with a hexagonal wurtzite-type structure. The V2O5 addition is
 the reason for an increase in grain size and some grains of oblong shape
 morphology in the ZnO ceramics. The dual addition of V2O5-B2O3 improved the
 liquid-assisted sintering of ZnO ceramics and resulted in further increase
 in grain size with more uniform grain growth. The reduction of sintering
 temperature to 900?C for ZnO ceramics was observed with the dual addition
 of V2O5 and B2O3. The room temperature PL spectra of the Z (ZnO), ZV (ZnO
 with 0.5mol% V2O5) and ZVB (ZnO with 0.5mol% V2O5 and 0.5mol% B2O3) ceramics
 revealed broad visible emission band because of impurities and defects in
 ZnO ceramics caused by oxygen vacancies due to vanadium and boron additions,
 as well as zinc interstitials. This emission band between 450-750 nm
 includes the entire visible region from blue to red.