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What is the effect of these conditions on the structure of solids? My book has the answer that confuses me. I got nothing about it. Can you please explain? The answer of the book is

With the increase in temperature, coordination number of ion decrease. With the increase in pressure the coordination number of ions increase.

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    $\begingroup$ Roughly speaking, that is generally correct. Increasing temperature, which implies increasing atomic vibrations, might make a less dense, more open crystal structure the preferred option. Increasing pressure will favor small volume crystal structures, increasing the number of nearest neighbors. $\endgroup$ – Jon Custer Jul 28 '17 at 16:01

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