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Skolkovo Institute of Science and Technology (Skoltech)

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Microphotographs of laser-heated potassium azide samples at pressures of 500,000 atmospheres (left) and 300,000 atmospheres (right). The white to light-blue areas on the outside are K1N3. Toward the center, the material has transformed into K2N6 in the left photo and a mysterious and poorly understood compound with the formula K3(N2)4 on the right.

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Yu Wang et al./Nature Chemistry

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