Question

Problem #11) Please answer to the following questions: i) Conceptually there is one characteristic that can be used to distinguish between a glass and a crystalline material. Describe this characteristic in 2 bullet points or less. ii) Semiconductor materials like Si and GaAs have electron-hole pairs as their intrinsic point defects. Using bonding as the starting point briefly explain why these materials don't have vacancies like metals or Schottky or Frenkel defects like ionic ceramics, as their primary intrinsic point defects.

Answer 1

Answer 1

The most basic difference between crystalline solids and noncrystalline solids (NCS) is that :

1. A long-range order in the distribution of atoms (ions) or molecules exists in the crystalline material but not in the glass/ non crystalline material.

2. Crystalline material are Anisotropic in nature i.e value of given property is different in all direction whereas glass/ non crystalline material is are isotropic in nature i.e value of given property is same in all direction.

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