perfect crystal

With the increase of sintered temperature, the barium ferrites prepared by coprecipitation-melted salt method come from imperfect crystal to perfect crystal, while the barium ferrites prepared by Sol-Gel method come from soft magnetic phases to permanent magnetic phases, and there are two phases in 800 ℃.

随焙烧温度的升高，采用共沉淀-熔盐法制备的样品逐步由非晶态向晶态转化，而溶胶-凝胶法制备的样品，由软磁相向永磁相转化，800℃时两相共存。

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We looked at pressure change before, actually, in discussing the third law, the fact that the entropy goes to zero as the absolute temperature goes to zero for a pure, perfect crystal.

在讨论热力学第三定律的时候，我们讨论过压强变化，即对于纯净的完美晶体，随着温度下降到绝对零度熵也变成零。

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