X-ray diffraction output

Figure 9.4 shows the X-ray diffraction output of a magnesium-potassium phosphate ceramic in which boric acid was added as a retardant. The amount of boric acid was 1 wt% of MgO in the powder blend. The X-ray diffraction pattern indicated that the polymeric coating on the MgO particles was a low-solubility magnesium-boron-phosphate compound, called liinebergite ... 

X-ray diffraction output of MgKP04 6H20 ceramic with boric acid. 

The X-ray diffraction output of this ceramic and its microstructure is shown in Figs. 9.7 and 9.8, respectively. The X-ray diffraction pattern does not contain any peaks other than those of MKP and unreacted MgO. Similarly, the scanning electron microphotographs show only crystals of MKP. Thus, unlike other cements such as those formed by ammonium phosphates in which reaction products contain more than one phase, this product is comparatively phase pure. 

X-rays are collected and analy2ed in ema in one of two ways. In wds, x-rays are dispersed by Bragg diffraction at a crystal and refocused onto a detector sitting on a Rowland circle. This arrangement is similar to the production of monochromati2ed x-rays for xps described above. In the other approach, edx, x-rays are all collected at the same time in a detector whose output scales with the energy of the x-ray (and hence, Z of the material which produces the x-ray.) Detectors used for ema today are almost exclusively Li-drifted Si soHd-state detectors. 

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