WHY ARE FACE-CENTERED CUBIC METALS MORE DUCTIC, BETTER CONDUCTORS OF HEAT AND ELECTRICITY COMPARED TO BODY-CENTERED CUBICS?
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WHY ARE FACE-CENTERED CUBIC METALS MORE DUCTIC, BETTER CONDUCTORS OF HEAT AND ELECTRICITY COMPARED TO BODY-CENTERED CUBICS?
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- What is thermal conductivity?Copper is a typical face-centered-cubic metal. In its pure state, it has extremely high electrical conductivity. Oxygen in copper causes a major reduction of conductivity. To investigate this issue further, I want to you to tell me whether oxygen atoms substitute for copper atoms, or if they enter interstitial sites.Which of the following statements are true? (This question has more than one correct answer) a. Higher thermal conductivity in metals arises in part from the properties of the free electron model of metals b. Dislocations and imperfections reduce the efficiency of phonon heat transfer c. Significant heat transfer occurs by both phonons and electron energy level excitation in both metals and ceramics d. Dislocations and imperfections increase the efficiency of phonon heat transfer
- The form of pure iron at room temperature called: O Ferrite with a BCC crystal structure O 8-ferrite with a FCC crystal structure O Austenite with a FCC crystal structure O Ferrite with a FCC crystal structureWhat are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: a. To match the thermal conductivity of the TBC to the metal substrate b. To increase the weight of the TBC c. To prevent a change of the crystallographic structure as the temperature changes d. To match the thermal conductivity of the TBC to the underlying oxide layer e. To avoid breakage during change in thermal conditionsWhat is heat?
- Calculate the number of vacancies per cubic meter for some metal, M, at 811°C. The energy for vacancy formation is 0.89 eV/atom, while the density and atomic weight for this metal are 6.96 g/cm3 (at 811°C) and 55.72 g/mol, respectively.What do you understand by charge stratification? Explain the method of achieving the same with Suitable sketches. Discuss the advantages and disadvantages of charge stratification(a) What is the physical interpretation of the Grashof number?
- Calculate the number of vacancies per cubic meter for some metal, M, at 806°C. The energy for vacancy formation is 0.88 eV/atom, while the density and atomic weight for this metal are 5.24 g/cm^ (at 806°C) and 44.02 g/mol, respectively.Calculate the number of vacancies per cubic meter at 1000°C for a metal that has an energy for vacancy formation of 1.22 eV/atom, a density of 6.25 g/cm3, and an atomic weight of 37.4 g/mol.</o:p> (A) 1.49 ×1018 m−3</o:p> (B) 7.18 ×1022 m−3</o:p> (C) 1.49 ×1024 m−3</o:p> (D) 2.57 ×1024 m−3</o:p>Some of the metals possess a body-centered crystal structure. Which of the following statements is correct about the structure? a. There are atoms found at the center of each face of the cube. b. It has a density lower than scc. c. The corner atoms touch the center atom but not each other. d. It has a packing efficiency (74%) greater than scc and bcc.