CN↓ radi↓ 12 8 3 12)6 4 12 BCC FCC CN of BCC: 8(a)+6(a) CN of FCC: 12(a) 0.290nm 7= aB 4 0.364nm 0.12557nm 0.128674nm
CN radii BCC FCC CN of BCC:8( )+6(a) CN of FCC:12( ) rα= = rβ= = = 0.12557nm = 0.128674nm a 2 3 a 2 2 a 4 3 0.290nm 4 3 a 4 2 0.364nm 4 2
Goldschmidt atomic radii is the radii of atom in structures with CN=12 Size factorδ is defined as dd dB×100%
Goldschmidt atomic radii is the radii of atom in structures with CN=12 Size factor is defined as 100% − = A A B d d d
2. What is Electrochemical factor -Electronegativity X X represents the ability of an atom of an element in the compond to attract electrons to itself Paul's empirical rule: X=0.37+ +0.5 n: valence rO: simple bond radius
2. What is Electrochemical factor —— Electronegativity X X represents the ability of an atom of an element in the compond to attract electrons to itself. Pauli’s empirical rule: 0.5 1 0.31 (1) + + = r n X n: valence r(1): simple bond radius