There’s been an unsolved mystery associated with mixed valence compounds: When the valence state of an element in these compounds changes with increased temperature, the number of electrons associated with that element decreases, as well. But just where do those electrons go? Using a combination of state-of-the-art tools, researchers have come up with the answer.

Via:: https://www.nanowerk.com/nanotechnology-news/newsid=48562.php

Where did those electrons go? X-ray measurements solve decades-old mystery

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