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## Summary:

- Monoclinc primitive crystal, why is (100) d-spacing not equal to lattice cell dimension a.

## Main Question or Discussion Point

Why is it that the d-spacing of the (100) plane is not equal to the lattice cell dimension a.

I can calculate the (010) and (001) d-spacings and they are equal to b & c lattic cell dimensions which is what I expected.

Small bit of background.

My task was to write a small program that calculates the d-spacing for whatever plane the user inputs.

The user inputs the a,b,c & alpha, beta, gamma parameters and use an equation to calculate d-spacings for each of the planes.

The Monoclinc cell has dimensions a=0.52, b=0.54, c=56, alpha=gamma=90deg, beta = 99.18deg.

Any thoughts would be welcome.

Thanks

I can calculate the (010) and (001) d-spacings and they are equal to b & c lattic cell dimensions which is what I expected.

Small bit of background.

My task was to write a small program that calculates the d-spacing for whatever plane the user inputs.

The user inputs the a,b,c & alpha, beta, gamma parameters and use an equation to calculate d-spacings for each of the planes.

The Monoclinc cell has dimensions a=0.52, b=0.54, c=56, alpha=gamma=90deg, beta = 99.18deg.

Any thoughts would be welcome.

Thanks