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صريحي
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powder photographs of two specimens A and B, are taken with a camera of radius 9cm.the arc ( difference between coresponding lines on the film )are shown in the pure below. both of which are known to belong to the cubic system sepcimen A is pure while B contains some impurities which gives rise to three lines.the unit cell dimension of Ais 6.576 angstroms .
1- suggest the probable lattice type of A and B .
2- IDENTIFY TH THREE IMPURITY LINES IN SAMPLE B.
3- FIND THE WAVELENGTH OF THE RADIATION USED AND THE DIMENSION OF THE LATTICE B.
4- SHOW THAT YOUR SOLUATION GIVES SATISFACTORY AGREEMENT FOR ALL THE LINES ASSOCIATED WITH THE PURE SAMPLE AND GIVE THEIR INDICES.
LA cm : 25.28-24.60-24.02-23.51-23.04-22.20-21.81-21.45
LB cm : 23.94-22.09-20.80-20.62-19.33-18.16-17.06-15.99
LA cm : 21.10-20.76-20.43-20.11-19.48-19.81-21.10-20.76-20.43
LB cm : 14.95-13.93-13.50-12.94-11.88-11.20-14.95-13.93-13.50
RULES :
L/2R = (PI/2) - angle ( theta)........(1)
n ( wavelength) = 2dsin( theta ) .......(2)
d=a/ { (h^2)+(k^2)+(l^2) }^1/2.......(3)
ans:
we find ( theta) from (1) for every L , then we find d ..from d we find ( h.k.l) ..then we idenify the type of lattice ..
but how can i get d ? how can i drow the relations? how can i find exact value of ( h.k.l) from the drowing ?what is the relation between intensity and d ( rule ) ?
how can i analysis the experament? pleez anyone could help.. help me...
1- suggest the probable lattice type of A and B .
2- IDENTIFY TH THREE IMPURITY LINES IN SAMPLE B.
3- FIND THE WAVELENGTH OF THE RADIATION USED AND THE DIMENSION OF THE LATTICE B.
4- SHOW THAT YOUR SOLUATION GIVES SATISFACTORY AGREEMENT FOR ALL THE LINES ASSOCIATED WITH THE PURE SAMPLE AND GIVE THEIR INDICES.
LA cm : 25.28-24.60-24.02-23.51-23.04-22.20-21.81-21.45
LB cm : 23.94-22.09-20.80-20.62-19.33-18.16-17.06-15.99
LA cm : 21.10-20.76-20.43-20.11-19.48-19.81-21.10-20.76-20.43
LB cm : 14.95-13.93-13.50-12.94-11.88-11.20-14.95-13.93-13.50
RULES :
L/2R = (PI/2) - angle ( theta)........(1)
n ( wavelength) = 2dsin( theta ) .......(2)
d=a/ { (h^2)+(k^2)+(l^2) }^1/2.......(3)
ans:
we find ( theta) from (1) for every L , then we find d ..from d we find ( h.k.l) ..then we idenify the type of lattice ..
but how can i get d ? how can i drow the relations? how can i find exact value of ( h.k.l) from the drowing ?what is the relation between intensity and d ( rule ) ?
how can i analysis the experament? pleez anyone could help.. help me...