A nanoresolution translation setup for Bridgman technique was designed and employed for the growth of organic crystal meta-nitroaniline using stepper motor. Ultrasmooth and vibration-free translation was accomplished in microstepping mode. Linear translation of 40nm per microstep has been achieved. A potential molecular organic crystal meta-nitroaniline of 18mm diameter and 80mm length has been successfully grown with good optical quality. Ultraviolet-visible-near-infrared spectra showed excellent transmission from 1100to520nm. Etching studies reveal lower defect density.
X-ray powder diffraction is an established method for the qualitative identification of crystalline materials and their quantitative analysis. The new generation of X-ray diffraction systems are based on expensive digital/embedded control technology and computer interfaces. Yet many laboratories use conventional manual-controlled systems withXYstrip-chart recorders. Since the output spectrum is a strip chart (hard copy), raw data, essential for structural and qualitative analysis, are not readily available for further analysis. Upgrading to modern computerized diffractometers is very expensive. The proposed automation design described here is intended to enable the conventional diffractometer user to collect, store and analyze data quickly. The design also improves the resolution by five times compared with the conventional setup. For the automation, a PC add-on card has been designed to control and collect the timing and intensity counts from the conventional X-ray diffractometer, and suitable software has been developed to collect, process and present the X-ray diffraction data for both qualitative and quantitative analysis. Moreover, a major advantage of this design is that it does not warrant any physical modification of the hardware of the conventional setup; it is simply an extension to enhance the performance of collecting raw data with a higher resolution at desired intervals/timings.
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