NbO2, Nb0.98V0.02O2, and Nb0.95V0.05O2 transform from semiconducting to metallic state at temperatures higher than the DTA phase-transition temperatures. Vibrational mode softening and c-axis NbNb pairing appear to be important factors in the mechanism of these transitions. In the solid solutions,
c
a
ratio is maximum at x = 0.5 since the metal-metal interaction along the c axis becomes minimum; conductivity is minimum at this composition since there are no mobile electrons.
Budhi Singh, Yasir Hassan, Nasir Ali, Santosh Durairaj, Jimin Jang, Tien Dat Ngo, Jyoti Saini, Muhammad Sabbtain Abbas, Kenji Watanabe, Takashi Taniguchi, Min Sup Choi, Subhasis Ghosh, Taesung Kim, Hyung Mo Jeong, Sungjoo Lee, Won Jong Yoo, Pawan Kumar Srivastava, Changgu Lee
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