The S r values of the MGS:0.12Eu 3+ ,0.004Mn 4+ sample show an increasing trend, with a maximum S r of 3.38% K −1 at 473 K, as shown in Figure 11 e.
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Structural Investigation and Energy Transfer of Eu<sup>3+</sup>/Mn<sup>4+</sup> Co-Doped Mg<sub>3</sub>Ga<sub>2</sub>SnO<sub>8</sub> Phosphors for Multifunctional Applications.
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The sentences
The value of S a shows a decreasing trend with increasing temperature and has a maximum value of 0.041 K −1 at 298 K.