The third type of point defect is impurity atom. Impurities can be classified as（）间隙 impurity atom or（）置换impurity atom.

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• Steel is an interstitial solid solution with impurity carbon atoms in iron crystal lattice.
• When impurity atoms replace the host atoms, it is called aan　 solid solution
• Steel is an interstitial solid solution with impurity carbon atoms in iron crystal lattice