透镜试样制备（Lens specimen preparation）.docVIP

透镜试样制备（Lens specimen preparation） Here is a little information, I hope it will help you. Generally, the units that provide the transmission electron microscope services can delegate sample preparation Sample requirements 1. basic requirements for powder samples (1) the size of a single powder is preferably less than 1 m; (2) non-magnetic; (3) inorganic component is the main factor, otherwise it will cause serious pollution of electron microscope, high voltage jump and even knock out the high pressure gun; 2. bulk sample basic requirements (1) it needs electrolytic thinning or ion thinning to obtain a few nanometers of thin area to observe; (2) if the grain size is less than 1 m, the powder can be made by mechanical methods such as crushing; (3) non-magnetic; (4) the preparation of block sample is complex, time-consuming and difficult to process. It needs to be directed or prepared by experienced teachers. The preparation of the sample will directly affect the observation and analysis of the electron microscope behind it. Therefore, it is better to communicate with and consult with TEMs teacher before preparing a block sample, or to prepare it for the teacher. Two 、 preparation of samples before delivery The 1. goal is to clear: (1) what to do (such as determining the growth direction, nanorods analysis of a crystal surface defect, the special observation phase structure analysis, orientation relationship, and the second phase of the main interface lattice matching and so on); (2) to solve the problem of what; 2., the sample is tested by X-Ray powder diffraction (XRD), and the structure is determined before deciding whether to make HRTEM. This saves time and obtains more microstructure information on the basis of XRD. 3. HRTEM ago, please take XRD data and other experimental results, the necessary communication with teacher HRTEM, to determine whether the purpose; at the same time HRTEM teacher will according to other experimental data for you, offer good advice to y