![2. Sic has an fce lattice with si in lattice positions. Given radii of si 0.04nm and C 0.016nm, calculate the following: (a) What is the coordination number for Si? (b) Calculate the lattice parameter for the unit cell (c) Calculate the density of SiC (d) Which direction will have the highest linear density of atoms: [100]. [110] or [111]? (e) Why is this material brittle?](http://img.homeworklib.com/questions/c847de60-b0e4-11eb-9318-6746149830da.png?x-oss-process=image/resize,w_560)
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2. Sic has an fce lattice with si in lattice positions. Given radii of si 0.04nm...
7. ZnS has an FCC lattice with S2- in lattice positions. a. Calculate the number of...
7. ZnS has an FCC lattice with S2- in lattice positions. a. Calculate the number of S2- atoms in a unit cell. b. Given radii of Zn2+=0.88 nm and S2 =2.19 nm, calculate the coordination number. C. How must the Zn2+ ions be arranged in order to maintain charge neutrality and consistent packing size? d. Which direction will have the highest linear density of atoms: [100], [110], or [111]?
Calculate (a) LD for FCC Al and (b) for BCC Cr Problem 4 on Linear density...
Calculate (a) LD for FCC Al
and (b) for BCC Cr
Problem 4 on Linear density of atoms (LD) LD along a certain direction vector of a crystal is defined as LDZ= number of atoms centered along the x direction vector length of the x direction vector For example, along 100 direction of a cubic crystal Linear density is defined as LD 100 = 1 number of atoms centered on [100] direction vector length of [100] direction vector Similarly LD...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth. Myth has a molecular formula of AxBy, adopts an cubic arrangement of atoms as shown on the left. Find out how many atoms are present in each unit cell. a) Determine the molecular formula of myth. b) Calculate the atomic packing factor (APF) of the given arrangement. The atomic radii of A (red) and B (blue) are equal to 120...
Silver has an FCC crystal structure. The lattice parameter a of Ag is 0.4084nm. Calculate the...
Silver has an FCC crystal structure. The lattice parameter a of Ag is 0.4084nm. Calculate the planar concentration (number of atoms per m2) in the planes (100), (110) and (111). Which plane has highest concentration?
2. Elemental Si crystallizes with a diamond cubic structure is shown at right below. The Si...
2. Elemental Si crystallizes with a diamond cubic structure is shown at right below. The Si atoms form an foc unit cell with a certain fractions of the tetrahedral sites occupied. a) How many octahedral sites_ and how many tetrahedral sites____ are there per unit cell. How many tetrahedral sites are occupied __ per unit cell. b) How many si atoms per unit cell (or within unit cell) ___ (justify your answer below) c) What is the coordination of the...
1)(5 points) Walter White who lives in Side-centered cubic (scc) cell Simeranya (a utopic city in...
1)(5 points) Walter White who lives in Side-centered cubic (scc) cell Simeranya (a utopic city in Anarres) Top view prepares blue crysta ls, named as myth, which adopt a side-centered cubic (scc) cell, where atoms occupy the center of sides of a cubic cell. (The myth molecule is assumed to have a perfect spherical shape.) a) Find out how many atoms are present in each unit cell. Calculate the atomic packing factor (APF) of scc unit cell. c) b) Given...
Side-centered cubic (scc) cell Top view 1) (5 points) Walter White who lives in Simeranya (a...
Side-centered cubic (scc) cell Top view 1) (5 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth, which adopt a side-centered cubic (scc) cell, where atoms occupy the center of sides of a cubic cell. (The myth molecule is assumed to have a perfect spherical shape.) a) Find out how many atoms are present in each unit cell. b) Calculate the atomic packing factor (APF) of scc unit cell. c) Given...
Use foam balls and toothpicks to create a space-filling model of a simple cubic unit cell....
Use foam balls and toothpicks to create a space-filling model of a simple cubic unit cell. The surfaces of the balls should be touching. On the cube above, draw a cut- away view showing only the atoms (or parts of atoms) inside one unit cell. Pay particular attention to where atoms touch (or not). One atom has been drawn in for you as an example. Number of atoms per unit cell - Coordination number (number of nearest neighbors)- Co A...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most con...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most concentration of atoms per unit area? Sometimes the number of atoms per unit area nsurface on the surface of a crystal is estimated by using the relation nsurface - nbulk2/3 where nbulk is the concentration of atoms in the bulk. Compare nsurface values with...
The crystal lattice and lattice parameters of sodium chloride (NaCl) salt are given below. a =...
The crystal lattice and lattice parameters of sodium chloride (NaCl) salt are given below. a = b = c = 2.8 A, a=B=y=90° Atomic radii (in A): Ina -1.80 and rc -1.00 Ionic radii (in A): Na+ = 1.13 and Ta-- 1.67 (a) Identify the lattice points and unit cell of NaCl. (3 marks) (b) Name the Bravais lattice of NaCl. (1 mark) (c) Determine the density (ing cm) of Naci. (3 marks) (d) Determine the atomic packing factor of...
7. ZnS has an FCC lattice with S2- in lattice positions. a. Calculate the number of S2- atoms in a unit cell. b. Given radii of Zn2+=0.88 nm and S2 =2.19 nm, calculate the coordination number. C. How must the Zn2+ ions be arranged in order to maintain charge neutrality and consistent packing size? d. Which direction will have the highest linear density of atoms: [100], [110], or [111]?
Calculate (a) LD for FCC Al
and (b) for BCC Cr
Problem 4 on Linear density of atoms (LD) LD along a certain direction vector of a crystal is defined as LDZ= number of atoms centered along the x direction vector length of the x direction vector For example, along 100 direction of a cubic crystal Linear density is defined as LD 100 = 1 number of atoms centered on [100] direction vector length of [100] direction vector Similarly LD...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth. Myth has a molecular formula of AxBy, adopts an cubic arrangement of atoms as shown on the left. Find out how many atoms are present in each unit cell. a) Determine the molecular formula of myth. b) Calculate the atomic packing factor (APF) of the given arrangement. The atomic radii of A (red) and B (blue) are equal to 120...
Silver has an FCC crystal structure. The lattice parameter a of Ag is 0.4084nm. Calculate the planar concentration (number of atoms per m2) in the planes (100), (110) and (111). Which plane has highest concentration?
2. Elemental Si crystallizes with a diamond cubic structure is shown at right below. The Si atoms form an foc unit cell with a certain fractions of the tetrahedral sites occupied. a) How many octahedral sites_ and how many tetrahedral sites____ are there per unit cell. How many tetrahedral sites are occupied __ per unit cell. b) How many si atoms per unit cell (or within unit cell) ___ (justify your answer below) c) What is the coordination of the...
1)(5 points) Walter White who lives in Side-centered cubic (scc) cell Simeranya (a utopic city in Anarres) Top view prepares blue crysta ls, named as myth, which adopt a side-centered cubic (scc) cell, where atoms occupy the center of sides of a cubic cell. (The myth molecule is assumed to have a perfect spherical shape.) a) Find out how many atoms are present in each unit cell. Calculate the atomic packing factor (APF) of scc unit cell. c) b) Given...
Side-centered cubic (scc) cell Top view 1) (5 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth, which adopt a side-centered cubic (scc) cell, where atoms occupy the center of sides of a cubic cell. (The myth molecule is assumed to have a perfect spherical shape.) a) Find out how many atoms are present in each unit cell. b) Calculate the atomic packing factor (APF) of scc unit cell. c) Given...
Use foam balls and toothpicks to create a space-filling model of a simple cubic unit cell. The surfaces of the balls should be touching. On the cube above, draw a cut- away view showing only the atoms (or parts of atoms) inside one unit cell. Pay particular attention to where atoms touch (or not). One atom has been drawn in for you as an example. Number of atoms per unit cell - Coordination number (number of nearest neighbors)- Co A...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most concentration of atoms per unit area? Sometimes the number of atoms per unit area nsurface on the surface of a crystal is estimated by using the relation nsurface - nbulk2/3 where nbulk is the concentration of atoms in the bulk. Compare nsurface values with...
The crystal lattice and lattice parameters of sodium chloride (NaCl) salt are given below. a = b = c = 2.8 A, a=B=y=90° Atomic radii (in A): Ina -1.80 and rc -1.00 Ionic radii (in A): Na+ = 1.13 and Ta-- 1.67 (a) Identify the lattice points and unit cell of NaCl. (3 marks) (b) Name the Bravais lattice of NaCl. (1 mark) (c) Determine the density (ing cm) of Naci. (3 marks) (d) Determine the atomic packing factor of...
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