A study of V 2−x Mg x O 5−δ (x = 0.05–0.30) systems has been revealed a decreasing trend in density (3.2–2.7 gcm −3 ) and thermal stability with MgO concentration.
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Structural, optical, thermal and conducting properties of V<sub>2-x</sub>Li<sub>x</sub>O<sub>5-δ</sub> (0.15 ≤ x ≤ 0.30) systems.
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The sentences
The values of σ ac and σ dc show an increasing trend with an increase in lithium content (7.5–15 mol%) as shown in Fig. 11 .