Given an alloy of Cu, Ag and Au in which Cu atoms constitute the ccp arrangement . If the hypothetical formula of the alloy is `Cu_4 Ag_3 Au` , the probable locations of Ag and Au atoms are

Options

A. Ag - All tetrahedral voids, Au -all octahedral voids
B. Ag - `3//8^(th)` tetrahedral voids, Au - `1//4^(th)` octahedral voids
C. Ag-1/2 octahedral voids, Au -1/2 tetrahedral voids
D. Ag -all octahedral voids, Au -all tetrahedral voids

Answer

B

Explanation

`{:(Cu_(4),"Ag"_(3),Au),(darr,darr,darr),("From c.c.p.,",(3)/(8)th " of tetrhedral voids",(1)/(4) " of octahedral voids "[ :." No. of O-voids = 4"] ),(z = 4,[:. " No. of T -voids" = 8],):}`