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

What is permeability?, It is the property of a material by virtue of which ...

It is the property of a material by virtue of which it allows itself to be magnetized. Permeability varies from material to material depending upon the saturation and temperature.

Final image is formed at the near point of the eye, A compound microscope w...

A compound microscope with an objective of 1.0 cm focal length and an eye-piece of 2.0 cm focal length has a tube length of 20 cm. Measure the magnifying power of the microscope, i

Which gates are known as universal gates, Which gates are known as universa...

Which gates are known as universal gates? Draw the circuit symbols of n-p-n and p-n-p transistor.

Lawson criterion, Lawson criterion (J.D. Lawson): A situation for the ...

Lawson criterion (J.D. Lawson): A situation for the release of energy from a thermonuclear reactor. Usually it is stated as the minimum value for the product of the density of

Explain the energy and power in circuits, Explain the Energy and Power in C...

Explain the Energy and Power in Circuits Electrical power dissipated in a circuit or a single circuit element can be calculated using P = I V     where power (P) is in wa

Polarisation, production and analysis of diffrent polarised light

production and analysis of diffrent polarised light

Angular velocity is contiguously decreasing, Which graph represents the ang...

Which graph represents the angular velocity as function of time in which the magnitude of angular velocity is contiguously decreasing? Ans) That is down parabola from origin gra

Heat, what is expansion of solids

what is expansion of solids

What is the dimentional formula of surface tension?, Surface tension is a ...

Surface tension is a contractive tendency of the surface of a liquid that permits it to resist an external force. It is revealed, for instance, in the floating of some objects on t

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