Comparison of more or less noisy quartz crystal resonators by X-rays scattering

This paper deals with the dismantling part of the quartz crystal resonators to get "Reverse Engineering". We measured phase noise in quite several prototypes of 5 MHz SC-cut resonators from bad to very good. Then, we show the few possible experimental methods we used in the search for intrinsic information regarding the quartz material. Light scattering and X-rays are used methods to localize and quantify internal defects of the resonator material i.e., quartz in our case. We study the possible residual defects of the quartz crystal material, influence of the chemical impurities present, and try to conclude.