| 摘要 |
According to one embodiment, there is provided an active substance. The active substance contains active material particles. The active material particles comprise a compound represented by the formula: Ti 1-x M1 x Nb 2-y M2 y O 7 . The active material particles has a peak A attributed to a (110) plane which appears at 2¸ ranging from 23.74 to 24.14°, a peak B attributed to a (003) plane which appears at 2¸ ranging from 25.81 to 26.21° and a peak C attributed to a (-602) plane which appears at 2¸ ranging from 26.14 to 26.54° in an X-ray diffraction pattern of the active material particles. An intensity I A of the peak A, an intensity I B of the peak B, and an intensity I C of the peak C satisfy the relation (1): 0.80 ‰¤ I B /I A ‰¤ 1.12; and the relation (2) I C /I B ‰¤ 0.80. |
