- #1

upside-down

- 1

- 1

- Homework Statement
- Predict the positions of the peaks on the XRD pattern if it were collected instead using a D2 diffractometer equipped with a Co tube and no monochromator.

- Relevant Equations
- Bragg's Law: wavelength = 2*d*sin(theta)

Cubic material: 1/d^2 = (h^2 * k^2 * l^2)/a^2

(Have attached pictures of these)

Hi, I know the material being studied is FeCO3.H20 (hydrated siderite) and the wavelength for a D2 diffractometer with a Co tube is 1.79026.

In order to use Bragg's Law to calculate the peak positions, I think I need to first calculate d using the equation with the Miller indices and a which is 6.65 angstroms. Then I would rearrange Bragg's Law for theta and solve this to find the peak positions.

However, I don't know what numbers the Miller Indices would be as I don't have access to the Powder Diffraction File. I also don't know if the fact that it has no monochromator would change any of the calculations as I would have to account for Kalpha and Kbeta.

In order to use Bragg's Law to calculate the peak positions, I think I need to first calculate d using the equation with the Miller indices and a which is 6.65 angstroms. Then I would rearrange Bragg's Law for theta and solve this to find the peak positions.

However, I don't know what numbers the Miller Indices would be as I don't have access to the Powder Diffraction File. I also don't know if the fact that it has no monochromator would change any of the calculations as I would have to account for Kalpha and Kbeta.