- #1
taishizhiqiu
- 63
- 4
I have come up with a paradox: Ionic crystals, in which cations and anions form a lattice, seems to have total electric dipole moment!
For example, consider a one dimensional example:
##+ - + - + - ... + - + -##
In the above picture, a ##+## represents a cation and a ##-## represents an anion.
So in calculating the total magnetic dipole moment, with the definition ##P=\int x \rho (x) dx##, I pair the ions and each cation anion pair have a dipole moment ##-ql##, where ##q## is charge and ##l## is the distance between the cation and anion. Then the total dipole moment is ##\frac{n}{2}ql##!
I don't think ionic crystals can have total dipole moment because if so, salt will have electric field around it!
Can anybody explain this to me?
For example, consider a one dimensional example:
##+ - + - + - ... + - + -##
In the above picture, a ##+## represents a cation and a ##-## represents an anion.
So in calculating the total magnetic dipole moment, with the definition ##P=\int x \rho (x) dx##, I pair the ions and each cation anion pair have a dipole moment ##-ql##, where ##q## is charge and ##l## is the distance between the cation and anion. Then the total dipole moment is ##\frac{n}{2}ql##!
I don't think ionic crystals can have total dipole moment because if so, salt will have electric field around it!
Can anybody explain this to me?