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Date: 14-5-2017
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Date: 8-5-2017
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Date: 8-5-2017
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IMPERFECTIONS AND IMPURITIES IN SOLIDS
Up to this point, we have been considering an ideal single-crystal structure. In areal crystal, the lattice is not perfect, but contains imperfections or defects; that is, the perfect geometric periodicity is disrupted in some manner. Imperfections tend to alter the electrical properties of a material and, in some cases, electrical parameters can be dominated by these defects or impurities.
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التوتر والسرطان.. علماء يحذرون من "صلة خطيرة"
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مرآة السيارة: مدى دقة عكسها للصورة الصحيحة
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نحو شراكة وطنية متكاملة.. الأمين العام للعتبة الحسينية يبحث مع وكيل وزارة الخارجية آفاق التعاون المؤسسي
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