# SAED d value and XRD Peak Position calculator

## SAED d value and XRD Peak Position calculator

Absorption Peak Wavelength (nm)

Results
(nm) d value
(2θ) XRD Peak Position

#### Calculation Tutorial:

STEP1: Take the raw image of Selected Area Electron Diffraction (SAED) from Transmission Electron Microscope (TEM) STEP2: Now enter the distance (nm) between two bright spots into "Distance between 2 bright spots" column of the calculator. You should get the calculated result of d value in the field below. SAED d value calculation

NOTE: XRD peak position is calculated by taking Laser wavelength as 0.15418 and n value as 1. The distance is in reciprocal space. We have made the calculator such that if you measure the distance directly from 1/nm scale (as shown in image) it would give you the exact d value results.

Theory behind d value calculation: Selected Area Electron Diffraction (SAED) is very important technique to determine the crystal structure of any material. It is a complementary technique in Transmission Electron Microscope (TEM), in which the Electrons are diffracted at a selected area and bright spots with dark background are observed as a result of this.
Distance between two bright spots (D) = 2 × Radius of that circle
The distance is in reciprocal space so we take inverse to convert it into real space
Thus, the formula for Interplanar spacing (d):
Interplanar spacing (d) = 2 / Distance between two bright spots

1. It’s difficult to locate well informed individuals
on this subject, but you sound like you understand what you’re talking about!
Thanks

2. How to calculate the d-spacing of single crystals using SAED pattern

3. How did you calculate d without camera constant??? This doesn't look correct.