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Date: 17-2-2019
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Date: 17-2-2016
1073
Date: 17-4-2019
1007
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Metals can have various types of defects. A point defectA defect in a crystal that affects a single point in the lattice. is any defect that involves only a single particle (a lattice point) or sometimes a very small set of points. A line defectA defect in a crystal that affects a row of points in the lattice. is restricted to a row of lattice points, and a plane defectA defect in a crystal that affects a plane of points in the lattice. involves an entire plane of lattice points in a crystal. A vacancyA point defect that consists of a single atom missing from a site in a crystal. occurs where an atom is missing from the normal crystalline array; it constitutes a tiny void in the middle of a solid (Figure 1.1). We focus primarily on point and plane defects in our discussion because they are encountered most frequently.
Figure 1.1 Common Defects in Crystals In this two-dimensional representation of a crystal lattice containing substitutional and interstitial impurities, vacancies, and line defects, a dashed line and arrows indicate the position of the line defect.
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حمية العقل.. نظام صحي لإطالة شباب دماغك
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إيرباص تكشف عن نموذج تجريبي من نصف طائرة ونصف هليكوبتر
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بمشاركة 60 ألف طالب.. المجمع العلمي يستعدّ لإطلاق مشروع الدورات القرآنية الصيفية
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صدور العدد الـ 33 من مجلة (الاستغراب) المحكمة
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المجمع العلمي ينظّم ورشة تطويرية لأساتذة الدورات القرآنية في كربلاء
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شعبة التوجيه الديني النسوي تختتم دورتها الثانية لتعليم مناسك الحجّ
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