Q1/ Aluminum is diffused into pure silicon to make a semiconductor material. How long should be the silicon be heated at 1300°C in contact with the aluminum such that the aluminum concentration at 0.01 mm below the surface of silicon. Q= 80 000 cal /mol. X=V Dt (Take :- Do for Al in Si is 8 cm2/sec. X= distance. t= time. D= Diffusion coefficient. R= gas constant = 2 %3D %3D cal/mol.°K
Q1/ Aluminum is diffused into pure silicon to make a semiconductor material. How long should be the silicon be heated at 1300°C in contact with the aluminum such that the aluminum concentration at 0.01 mm below the surface of silicon. Q= 80 000 cal /mol. X=V Dt (Take :- Do for Al in Si is 8 cm2/sec. X= distance. t= time. D= Diffusion coefficient. R= gas constant = 2 %3D %3D cal/mol.°K
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question
![Q1/ Aluminum is diffused into pure silicon to make a semiconductor
material. How long should be the silicon be heated at 1300°C in contact
with the aluminum such that the aluminum concentration at 0.01 mm
below the surface of silicon.
Q= 80 000 cal /mol. X=V Dt
X= distance. t = time. D= Diffusion coefficient. R= gas constant =
(Take :- Do for Al in Si is 8 cm²/sec.
%3D
cal/mol.°K
Q2/ The following results were obtained from a tensile test of a steel. The
test piece had a diameter of 10mm and a gauge length of 50mm. plot the
load – extension graph and determine (a) the tensile strength . (b) the
fracture stress. (c) the tensile modulus.
Load
5
10
15
20
25
30
32
28
KN
0 0.01 0.03 0.05 |0.07 0.08 | 0.1 0.15 0.25
(fracture)
Ext.
mm](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0e147023-127c-437a-8e69-4e483cc2f7ff%2F522de4d5-ff60-4dac-bff5-d7601009b357%2Fieaevb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q1/ Aluminum is diffused into pure silicon to make a semiconductor
material. How long should be the silicon be heated at 1300°C in contact
with the aluminum such that the aluminum concentration at 0.01 mm
below the surface of silicon.
Q= 80 000 cal /mol. X=V Dt
X= distance. t = time. D= Diffusion coefficient. R= gas constant =
(Take :- Do for Al in Si is 8 cm²/sec.
%3D
cal/mol.°K
Q2/ The following results were obtained from a tensile test of a steel. The
test piece had a diameter of 10mm and a gauge length of 50mm. plot the
load – extension graph and determine (a) the tensile strength . (b) the
fracture stress. (c) the tensile modulus.
Load
5
10
15
20
25
30
32
28
KN
0 0.01 0.03 0.05 |0.07 0.08 | 0.1 0.15 0.25
(fracture)
Ext.
mm
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