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Is it possible to observe a 4-fold axis of symmetry in a monoclinic crystal? Why or why not?
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- Discuss the differences between crystalline solids, amorphous solids, and gases.Calculate the concentration of vacancies in silicon at the solid-liquid equilibrium temperature of 1683K where single crystals of silicon are grown. The vacancy formation energy for vacancies in silicon is 2.3 eV/vacancy.How are vacancies created in a crystal?
- Why is it valid to represent the structure of a crystalline solid by the structure of its unit cell?A crystalline solid consists of atoms stacked up in a repeating lattice structure. Consider a crystal (a). The atoms reside at the corners of cubes of side L=0.200nm. One piece of evidence for the regular arrangement of atoms comes from the flat surfaces along which a crystal separates, or cleaves, when it is broken. Suppose this crystal cleaves along a face diagonal as shown in figure (b). Calculate the spacing d between two adjacent atomic planes that separate when the crystal cleaves.A computer chip 0.32cm thick is made up of layers of silicon. If the top and bottom layers are each 0.03cm thick and the inner layers are each 0.02cm thick, how many inner layers are there? A. 13 B. 15 C. 16 D. 52 E. 64.
- Why is it valid to represent the structure of a crystalline solid by the structure of its unit cell? What are the most important constraints in selecting a unit cell?When an FCC material has high stacking fault energy, do you expect widely-spaced or closely-spaced leading and trailing partial dislocations? Do you expect wavy or planar glide? Briefly explain both trends.Sketch the atomic structure of silicon and insert an impurity of arsenic as demonstrated for silicon.
- indicate the following lattice points (211) , (111) and (1 0 1) in an orthorhombic lattice structure with sides a= 5cm,, b =6cm and C =7cmYour answerDoes water of crystallization alter the properties of a substance?what is the packing factor of diamond? mass of carbon is 12 amu and lattice size is 0.36nm. as we know diamond is having cubic unit cell. what is the density of diamond?