Titlebook: Anisotropy in Single-Crystal Refractory Compounds; Fred W. Vahldiek,Stanley A. Mersol Book 1968 Springer-Verlag US 1968 crystal.refractori

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The New Geopolitics of Educational Aidare impurity-dominated, and that the most significant impurities are boron and nitrogen. Speculating on the origin of polytypes, it appears that any adequate theory must include the influence of chemical and physical imperfections, temperature, and ambient gas composition and pressure.