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c) Below is shown the cubic perovskite structure (ABX; -CaTiOj): Determine the coordinates of all atoms...
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...
Thanks In the cubic unit cell shown below, show atoms at the following coordinates: (1,0,1),
Thanks
In the cubic unit cell shown below, show atoms at the following coordinates: (1,0,1),
The ideal perovskite (ABO3) structure consists of AOs closest packed layers (ordered Am cations and O2-anions)...
The ideal perovskite (ABO3) structure consists of AOs closest packed layers (ordered Am cations and O2-anions) with B cations in ¼ of the octahedral holes. What pairs of charges are possible for A and B (there is more than one combination of charges)? For each pair, say which cation will likely sit in the closest packed layers and which will likely sit in the holes. Without specific examples of ions (e.g., Ca, Ti+), base your answer around the fact that...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown below (a derivative of the zinc blende structure). The Pt atoms form an fcc unit cell and N atoms occupy all tetrahedral sites. Please answer the following questions regarding this compound and its structure. (a) Identify the N atoms as either large spheres or small spheres (b) Indicate the coordination of the Natoms (show below (c) What is the formula of the compound how...
ReO3 structure is cubic with an Re atom at each corner of the unit cell and...
ReO3 structure is cubic with an Re atom at each corner of the unit cell and one O atom on each unit cell edge midway between Re atoms. Sketch the unit cell and determine (a) the coordination numbers of the ions and (b) number of atoms in the unit cell.
9. Rhenium oxide has a cubic structure with the Re atoms sitting at the eight corners...
9. Rhenium oxide has a cubic structure with the Re atoms sitting at the eight corners of the cube and the (O) atoms half way along the 12 edges of the cube: (a) Draw the structure and place the Re and O atoms in their positions (b) What is the molecular formula? contributions Explain your answer using fractional Re and O (c) What is the oxidation number of Re? (d) How many formula units per cell?, (e) Is the unit...
Answer the following questions 1. Give the coordinates of atoms in the unit cell 2. What...
Answer the following questions 1. Give the coordinates of atoms in the unit cell 2. What is the formula of diamond? Calculate Z. Found is the motif? 3. Give a projection of the structure in the (001) plane 4. What is the coordination number 5. Calculate the unit cell parameter a knowing that dc-e = 154pm 6. Describe the structure of Diamond 7. The structure of diamond is similar to any structure of the ionic compounds? 8. What is the...
3. The ReO2 structure is cubic with one Re atom at each corner of the unit...
3. The ReO2 structure is cubic with one Re atom at each corner of the unit cell and one O atom on each unit cell edge midway between the Re atoms. a. Sketch this unit cell. b. Determine the coordination number of each cation and anion. c. Confirm that the stoichiometry is consistent with the structure. d. Determine the identity of the structure type that would be generated if a cation were inserted into the center of the ReOz structure.
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters:...
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters: a=245pm, c 670pm. 1. Draw the unit cell. How many carbon atoms per unit cell. Specify the motif. 2. Give the coordinates of all atoms in the unit cell Give a projection of the structure in the (001) plane. 3. What is the coordination number of carbon atoms? 4. 5. Specify the hybridization of carbon. 6. Give the interatomic distances de-c? 7. Calculate the...
Question 1. a) Determine the indices of the cubic crystal plane that intersects the position coordinates...
Question 1. a) Determine the indices of the cubic crystal plane that intersects the position coordinates 1,1/4.0: 1.1.1/2: 34.1,1/4 (5 Marks) b) Sketch the (110) plane in a bcc unit cell and give the positions of the atoms whose centers are intersected by this plane. (5 Marks) c) Draw and state the indices for the major slip planes and slip directions that occur in the unit cells of iron, copper, and zinc. (10 Marks)
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...
Thanks
In the cubic unit cell shown below, show atoms at the following coordinates: (1,0,1),
The ideal perovskite (ABO3) structure consists of AOs closest packed layers (ordered Am cations and O2-anions) with B cations in ¼ of the octahedral holes. What pairs of charges are possible for A and B (there is more than one combination of charges)? For each pair, say which cation will likely sit in the closest packed layers and which will likely sit in the holes. Without specific examples of ions (e.g., Ca, Ti+), base your answer around the fact that...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown below (a derivative of the zinc blende structure). The Pt atoms form an fcc unit cell and N atoms occupy all tetrahedral sites. Please answer the following questions regarding this compound and its structure. (a) Identify the N atoms as either large spheres or small spheres (b) Indicate the coordination of the Natoms (show below (c) What is the formula of the compound how...
9. Rhenium oxide has a cubic structure with the Re atoms sitting at the eight corners of the cube and the (O) atoms half way along the 12 edges of the cube: (a) Draw the structure and place the Re and O atoms in their positions (b) What is the molecular formula? contributions Explain your answer using fractional Re and O (c) What is the oxidation number of Re? (d) How many formula units per cell?, (e) Is the unit...
Answer the following questions 1. Give the coordinates of atoms in the unit cell 2. What is the formula of diamond? Calculate Z. Found is the motif? 3. Give a projection of the structure in the (001) plane 4. What is the coordination number 5. Calculate the unit cell parameter a knowing that dc-e = 154pm 6. Describe the structure of Diamond 7. The structure of diamond is similar to any structure of the ionic compounds? 8. What is the...
3. The ReO2 structure is cubic with one Re atom at each corner of the unit cell and one O atom on each unit cell edge midway between the Re atoms. a. Sketch this unit cell. b. Determine the coordination number of each cation and anion. c. Confirm that the stoichiometry is consistent with the structure. d. Determine the identity of the structure type that would be generated if a cation were inserted into the center of the ReOz structure.
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters: a=245pm, c 670pm. 1. Draw the unit cell. How many carbon atoms per unit cell. Specify the motif. 2. Give the coordinates of all atoms in the unit cell Give a projection of the structure in the (001) plane. 3. What is the coordination number of carbon atoms? 4. 5. Specify the hybridization of carbon. 6. Give the interatomic distances de-c? 7. Calculate the...
Question 1. a) Determine the indices of the cubic crystal plane that intersects the position coordinates 1,1/4.0: 1.1.1/2: 34.1,1/4 (5 Marks) b) Sketch the (110) plane in a bcc unit cell and give the positions of the atoms whose centers are intersected by this plane. (5 Marks) c) Draw and state the indices for the major slip planes and slip directions that occur in the unit cells of iron, copper, and zinc. (10 Marks)
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