- #1
drizzle
Gold Member
- 200
- 57
hey everyone,
I’m a bit confused, I’m trying to calculate the relative occupied volume of ZnO unit cell, I’ve just calculated that Zn and O atoms occupy about 43.3% of the unit cell, there are 4 atoms per unit cell 2 for each one, although I doubt this value, does it varies or is it a constant value for ZnO, cause I found that Zn and O atoms occupy 40% from an article, the process I did to get this value is as follows:
Lattice constants: a=0.32495 nm, c=0.52069 nm
Ion radiuses: Zn =0.6 Å, O=1.38 Å
Spheres volume: Zn=9.0432E-31 m^3, O=1.10029E-29 m^3
Unit cell volume (Vu)=a^2*c=5.4981E-29 m^3
Total spheres volume (Vt)= 2*V(Zn)+2*V(O)= 2.38144E-29 m^3
The relative occupied V=[(Vt)/(Vu)]*100=43.3%
Another question please;
I found from some source that lattice constants of ZnO are given as: a = 0.3250 nm, c = 0.5207 nm and the unit cell volume of 47.63*10^-30 m^3. this volume is not calculated from the lattice constants where it is 5.5E-29 m^3, how was the unit cell volume calculated?
Thanks.
I’m a bit confused, I’m trying to calculate the relative occupied volume of ZnO unit cell, I’ve just calculated that Zn and O atoms occupy about 43.3% of the unit cell, there are 4 atoms per unit cell 2 for each one, although I doubt this value, does it varies or is it a constant value for ZnO, cause I found that Zn and O atoms occupy 40% from an article, the process I did to get this value is as follows:
Lattice constants: a=0.32495 nm, c=0.52069 nm
Ion radiuses: Zn =0.6 Å, O=1.38 Å
Spheres volume: Zn=9.0432E-31 m^3, O=1.10029E-29 m^3
Unit cell volume (Vu)=a^2*c=5.4981E-29 m^3
Total spheres volume (Vt)= 2*V(Zn)+2*V(O)= 2.38144E-29 m^3
The relative occupied V=[(Vt)/(Vu)]*100=43.3%
Another question please;
I found from some source that lattice constants of ZnO are given as: a = 0.3250 nm, c = 0.5207 nm and the unit cell volume of 47.63*10^-30 m^3. this volume is not calculated from the lattice constants where it is 5.5E-29 m^3, how was the unit cell volume calculated?
Thanks.