Research Article
Influence of Rare Earth Doping on Microstructure and Luminescence Behaviour of Sodium Sulphate
Table 1
The crystallite size and stress factor of pure, doped, and codoped Na2SO4 samples.
| | Phosphor | Crystallite size (nm) | FWHM values (rad) | spacing () | 2θ (degrees) | Stress factor (ε) ×10−3 | | T | M | T | M | T | M | T | M | T | M |
| | Na2SO4 | 55 | — | 0.29 | — | 1.43 | — | 32.4 | — | 1.2 | — | | Na2SO4 : | 22 | — | 0.37 | — | 2.77 | — | 32.3 | — | 5.5 | — | | Na2SO4 : Li0.5%, Eu0.5%, Dy0.2% | 59 | 98 | 0.14 | 0.083 | 2.77 | 3.95 | 32.3 | 22.5 | 2.1 | 1.8 | | Na2SO4 : Li0.5%, Eu0.5%, Dy0.5% | 39 | 82 | 0.21 | 0.100 | 2.77 | 3.95 | 32.3 | 22.5 | 1.5 | 2.2 |
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T and M correspond to thenardite and mirabilite content of Na2SO4.
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