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-rw-r--r--3665/CH4/EX4.1/Ex4_1.sce15
-rw-r--r--3665/CH4/EX4.2/Ex4_2.sce20
-rw-r--r--3665/CH4/EX4.3/Ex4_3.sce20
-rw-r--r--3665/CH4/EX4.4/Ex4_4.sce17
4 files changed, 72 insertions, 0 deletions
diff --git a/3665/CH4/EX4.1/Ex4_1.sce b/3665/CH4/EX4.1/Ex4_1.sce
new file mode 100644
index 000000000..d418666ff
--- /dev/null
+++ b/3665/CH4/EX4.1/Ex4_1.sce
@@ -0,0 +1,15 @@
+clc//
+//
+//
+
+//Variable declaration
+Ev=1;
+k=1.38*10^-23; //boltzmann constant(J/K)
+e=1.6*10^-19; //charge(eV)
+
+//Calculation
+r=Ev/(2.303*1000*k/e);
+n=10^r; //ratio of n1000/n500
+
+//Result
+printf("\n ratio of vacancies is %0.3f *10^5",n/10^5)
diff --git a/3665/CH4/EX4.2/Ex4_2.sce b/3665/CH4/EX4.2/Ex4_2.sce
new file mode 100644
index 000000000..a097b52fb
--- /dev/null
+++ b/3665/CH4/EX4.2/Ex4_2.sce
@@ -0,0 +1,20 @@
+clc//
+//
+//
+
+//Variable declaration
+Ev=1.2;
+k=1.38*10^-23; //boltzmann constant(J/K)
+e=1.6*10^-19; //charge(eV)
+T1=350; //temperature(K)
+T2=500; //temperature(K)
+
+//Calculation
+x1=Ev/(2.303*k*T1/e);
+n1=1/(10^x1); //number of vacancies per atom at 350K
+x2=Ev/(2.303*k*T2/e);
+n2=1/(10^x2); //number of vacancies per atom at 500K
+
+//Result
+printf("\n number of vacancies per atom at 350K is %0.4f *10^-17",n1*10^17)
+printf("\n number of vacancies per atom at 500K is %0.3f *10^-12",n2*10^12)
diff --git a/3665/CH4/EX4.3/Ex4_3.sce b/3665/CH4/EX4.3/Ex4_3.sce
new file mode 100644
index 000000000..bbec93cd1
--- /dev/null
+++ b/3665/CH4/EX4.3/Ex4_3.sce
@@ -0,0 +1,20 @@
+clc//
+//
+//
+
+//Variable declaration
+d=2.82*10^-10; //distance(m)
+k=1.38*10^-23; //boltzmann constant(J/K)
+e=1.6*10^-19; //charge(eV)
+T=273+25; //temperature(K)
+sd=5*10^11; //schotky defects(per m^3)
+
+//Calculation
+V=(2*d)^3; //volume of unit cell(m^3)
+N=4/V; //density of ion pairs
+x=(log10(N/sd));
+
+Es=2*(k/e)*T*2.303*x; //average energy required(eV)
+
+//Result
+printf("\n average energy required is %0.3f eV",Es)
diff --git a/3665/CH4/EX4.4/Ex4_4.sce b/3665/CH4/EX4.4/Ex4_4.sce
new file mode 100644
index 000000000..698226236
--- /dev/null
+++ b/3665/CH4/EX4.4/Ex4_4.sce
@@ -0,0 +1,17 @@
+clc//
+//
+//
+
+//Variable declaration
+T1=273+25; //temperature(K)
+T2=273+350; //temperature(K)
+Ef=1.35; //energy(eV)
+k=8.625*10^-5;
+
+//Calculation
+x=(Ef/k)*((1/(2*T1))-(1/(2*T2)))/2.303;
+r=1/(10^(x)); //ratio of Frenkel defects
+
+
+//Result
+printf("\n ratio of Frenkel defects is %0.3f *10^-6",r*10^6)