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Date: 14-5-2017
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Date: 20-5-2017
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Date: 18-9-2020
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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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علامات تحذيرية قد تسبق الموت القلبي المفاجئ لدى الشباب
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استنساخ ذئاب عملاقة وشرسة "انقرضت منذ آلاف السنين"
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أصواتٌ قرآنية واعدة .. أكثر من 80 برعماً يشارك في المحفل القرآني الرمضاني بالصحن الحيدري الشريف
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