Ordinate: It is the count detected by the receiver, and the unit is CPS- count per second.
In addition, a series of data will be given on the test table, including:
The first column of data is an angle of 2θ, which is used in the formula if divided by 2.
The second column of data d is the unit. ,
The third column of data BG may be background abbreviation;
The fourth column data, peak height, count value;
The fifth column of data, the relative peak height (%), is the relative intensity value with the strongest peak as the normalization standard;
The sixth column data, peak area;
The seventh column data, relative peak area (%);
The eighth column data, FWHM- full width at half maximum (pulse) peak full width at half maximum; Generally speaking, the height is enough to calculate the peak intensity, which means that all peaks are regarded as regular peaks. However, this FWHM can give specific peak information, which will bring special significance in the analysis.
The ninth column data, XS (? ), XS is the granularity (? )。
Wherein, that calculation is base on the formula of Bragg Law:
2d sin θ = nλ, where λ is the wavelength of X-ray, λ= 1.54056? The diffraction order n is any positive integer, in which the first-order diffraction peak is generally taken, and n= 1.
When X-rays are incident at grazing angle θ (complementary angle of incident angle, also called Bragg angle) on an atomic plane of your crystal or some crystal samples with D-plane spacing, Bragg equation can be satisfied, and this group of X-ray powder diffraction patterns (data) can be measured.