PVD, Physics

Assignment Help:
In order to deposit films of the alloy YBa2Cu3, the metals Y, Ba, and Cu are evaporated from three point
sources. The latter are situated at the corners of an equilateral triangle whose side is 20 cm. Directly above
the centroid of the source array, and parallel to it, lies a small substrate; the deposition system geometry is
effectively a tetrahedron, each side being 20 cm long.
a. If the Y source is heated to 1740 K to produce a vapor pressure of 10-3 torr, to what temperature must
the Cu source be heated to maintain film stoichiometry?
b. Rather than a point source, a surface source is used to evaporate Cu. How must the Cu source
temperature be changed to ensure deposit stoichiometry?
c. If the source configuration in part (a) is employed, what minimum O2 partial pressure is required to
deposit stoichiometric superconducting oxide YBa2Cu3O7 films by a reactive evaporation process?
The atomic weights are Y = 89, Cu = 63.5, Ba = 137, and O = 16.

Related Discussions:- PVD

Heavy water is often used as a moderator in thermal nuclear, 'Heavy water i...

'Heavy water is often used as a moderator in thermal nuclear reactors.' Give reason.

Person travels faster than light in a space shuttle, What happens if a pers...

What happens if a person travels faster than light in a space shuttle?  Ans) Interstellar space travel is manned or unmanned travel among stars. The concept of interstellar trav

Semiconductor materials: cadmium sulphide, Energy gap: 2.4ev.   The...

Energy gap: 2.4ev.   The colour of pure cadmium sulphide is pale yellow. It melts only under at high temperature. It can be prepared in the resistivity range from 10 to

What evidence is there supporting the big bang theory, What evidence is the...

What evidence is there supporting the Big Bang theory? In short, the universe is increasing. All of the galaxies we have observed that are great distance away are moving away f

Compute the reactance of capacitor, Q. A capacitor of capacitance 2 μF is i...

Q. A capacitor of capacitance 2 μF is in an ac circuit of 1000 Hz. Compute the reactance of it. Solution: Capacitive reactance XC        = 1 / ω C = 1 / 2π ν C =

Torque and equilibrium, What is the effect of torque and equilibrium on tap...

What is the effect of torque and equilibrium on taps,handlebars and bicycles?

Define laterite stone, Define Laterite stone. Laterite is called sedime...

Define Laterite stone. Laterite is called sedimentary rock. It has porous and spongy structure and can be simply quarried in blocks. It have high percentage of oxide of ion and

Determine the change in temperature of water, What is the change in tempera...

What is the change in temperature of water after falling over a 50.0-m-tall waterfall? Suppose that the water is at rest just before falling off and just after it reaches the b

G.m. counter, quenching process in g.m. counter

quenching process in g.m. counter

Electrical materials, Electrical materials: Materials which allow an el...

Electrical materials: Materials which allow an electric current to flow easily are known as conductors and those which prevent the flow of an appreciable current are known as i

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd