نتایج جستجو برای: diffraction
تعداد نتایج: 64792 فیلتر نتایج به سال:
The redetermination of the title compound, sodium pertechnate, from single-crystal CCD data recorded both at 296 and 100 K confirms previous studies based on X-ray powder diffraction film data [Schwochau (1962 ▸). Z. Naturforsch. Teil A, 17, 630; Keller & Kanellakopulos (1963 ▸). Radiochim. Acta, 1, 107-108] and neutron powder diffraction data using the Rietveld method [Weaver et al. (2017 ▸). ...
Condensed matter experiments at high pressure accentuate the need for accurate pressure scales over a broad range of temperatures, as well as placing a premium on a homogeneous pressure environment. However, challenges remain in diamond anvil cell technology, including both the quality of various pressure transmitting media and the accuracy of secondary pressure scales at low temperature. We di...
This work presents a structural investigation of La2-xNdxCe2O7 (x = 0.0, 0.5, 1.0, 1.5, 2.0) using X-ray powder diffraction and total scattering neutron powder diffraction, analysed using Rietveld and the reverse Monte Carlo method (RMC). Ab initio molecular dynamics (MD) modelling is also performed for further investigations of the local order. The main intensities in the neutron diffraction d...
properties investigation of poled (1-x)Bi0.5Na0.5TiO3-xBaTiO3 ceramics Jian Wang, Yun Liu, Ray L. Withers, Andrew Studer, Qian Li, Lasse Norén, and Yiping Guo Research School of Chemistry, The Australian National University, Canberra, ACT0200, Australia Bragg Institute, Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2232, Australia State Key Laboratory of MMC...
We present a detailed structural and magnetic characterization of sputter deposited thin film erbium, determined by x-ray diffraction, transport measurements, magnetometry and neutron diffraction. This provides information on the onset and change of the magnetic state as a function of temperature and applied magnetic field. Many of the features of bulk material are reproduced. Also of interest ...
This paper introduces a two-dimensional extension of the well established Rietveld refinement method for modeling neutron time-of-flight powder diffraction data. The novel approach takes into account the variation of two parameters, diffraction angle 2θ and wavelength λ, to optimally adapt to the varying resolution function in diffraction experiments. By doing so, the refinement against angular...
در این پایان نامه به بررسی کمی یک سیستم تصویربرداری پراش افزوده(diffraction enhanced imaging-dei) پرداخته ایم. بدین منظور مشخصات توان و شار و نحوه توزیع پرتوهای سینکروترون مورد بررسی قرار داده و سپس محاسبات پرتو خط بیم(national synchrotron light source) nsls شامل رزولوشن انرژی و شار رسیده به نمونه را انجام دادیم و در نهایت با ارائه یک مدل برای سیستم dei میزان بهبود کنتراست تصویر در این سیستم نس...
Electron diffraction covering a wide angular range from Bragg diffraction to small-angle diffraction
مسئله پخش امواج الکترومغناطیسی بوسیله شبکه ها و تعیین ضرایب برگشت و همچنین چگونگی انتقال و اندازه دامنه امواج برگشتی از مدتها قبل مورد توجه بوده و تحقیقاتی در این باره انجام شده است . جالب بودن مسئله بعلت برتری عملکرد شبکه های انکسار نسبت به منشور در اسپکتروسکوپی است . این برتری شامل قدرت تجربه بیشتر، اتلاف کمتر و همچنین امکان استفاده شبکه های انکسار در فرکانسهای مادون قرمز و ماوراء بنفش میباشد...
introduction: the aim of this study was to compare the chemical compounds of white proroot mineral trioxide aggregate (wmta) hydrated at different ph environments. methods and materials: mixed samples of wmta were kept in acidic (ph=5.4), neutral (ph=7.4) and alkaline (ph=9.4) environments for 48 h. then, x-ray diffraction (xrd) analysis was performed for both hydrated and powder forms of wmta....
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