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Home / Questions / Fill in the blanks in the following table Note knowledge in chapter 12 Compound AX

Fill in the blanks in the following table Note knowledge in chapter 12 Compound AX

Fill in the blanks in the following table (Note: knowledge in chapter 12)

Compound AX

Rc (nm)

Ra (nm)

Rc/Ra

CN

Crystal structure

# cation
Per unit cell

# anion
Per unit cell

No. AX
Per unit cell

CaO

0.100

0.140

           

MnS

0.067

0.184

           

CsBr

0.170

0.196

           

2. Calculate the theoretical density of NiO, given that it has the rock salt crystal structure. (note: knowledge in chapters 12 and 3)

3. Gallium arsenide (GaAs) and indium arsenide (InAs) are commonly used in semiconductor industry and solar cell industry. GaAs and InAs both have the zinc blende crystal structure and are soluble in each other at all concentrations.

1) Please sketch the phase diagram. Given the melting temperatures of GaAs and InAs are 1,238A????1C and 942A????1C, respectively;
2) Please calculate the average molecular weight, average density of the solid solution which contains

40wt% of InAs. Given the densities of GaAs and InAs are 5.316 and 5.668 g/cm3, respectively and the molecular weights of GaAs and InAs are 144.64 g/mol and 189.74 g/mol, respectively.
3) Please predict the volume of unit cell Vc and lattice parameter (unit cell edge length) a.

(note: knowledge in chapters 12, 9, 3, 4)

4. What is the Schottky pair defect in a ceramic oxide MO?
It is known oxygen ion can diffuse in ceramic oxide materials when oxygen vacancies are present. If the oxygen ion diffusion coefficients are 1.1*10-6 cm2/s and 2.5*10-4 cm2/s at 500oC and 700oC, please determine the oxygen diffusion activation energy. (note: knowledge in chapters 12 and 5)

5. Compute the critical crack tip radius (in nm) and fracture toughness (in MPa?m ) for a glass specimen that experiences tensile fracture at an applied stress of 70 MPa. Assume a critical surface crack length is

10A????12 mm and the theoretical fracture strength (maximum stress) equals to E/10 where E is the modulus of elasticity. Given E = 69 GPa and Y=1 for the glass specimen.
(note: knowledge in chapters 12, 8)

6. The modulus of elasticity for a ceramic material having 5 vol% porosity is 240 GPa. (a) Compute the modulus of elasticity for the nonporous material; (b) Compute the modulus of elasticity for 15 vol% porosity.
(note: knowledge in chapter 12)

 

Jun 19 2020 View more View Less

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