材料物理Background
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GSAS软件操作简介 2008-11-17 21:32:55| 分类: 学术研究 | 标签: |字号大中小 订阅 GENERAL STRUCTURE ANALYSIS SYSTEM 目前常用的Rietveld结构精修软件有GSAS, Fullprof, Rietan, BGMN, DBWS, WinPLOTR等等,其实他们的核心算法都是一样的。DBWS是最早的精修软件,但由于其是DOS操作界面,目前用户越来越少。而GSAS由于操作方便、界面友好、更新迅速而得到广泛使用。 GSAS有两个版本的软件,一个叫PC-GSAS,另外一个叫EXPGUI。PC-GSAS是Los Alamos National Laboratory的Allen C. Larson和Robert B. Von Dreele编写的,联系方式 Bob von Dreele - *****************,文章引用应标明:A.C. Larson and R.B. Von Dreele, "General Structure Analysis System (GSAS)", Los Alamos National Laboratory Report LAUR 86-748 (1994).PC-GSAS是基于人机对话的方式,操作起来稍显复杂。在这儿我们主要介绍EXPGUI。EXPGUI是B. H. Toby在GSAS的基础上编写的图形用户界面(Graphical User Interface)程序,可以说EXPGUI囊括了我们所经常用到的大部分GSAS的功能,但不是全部。文章引用应标明:B. H. Toby, EXPGUI, a graphical user interface for GSAS, J. Appl. Cryst. (2001). 34, 210-213. 联系方式: Brian Toby - ****************** 本文主要包括以下几个部分:1. 软件下载与安装2. 数据导入与模型建立3. 结构精修过程过程(背景函数,晶格参数,峰形参数,原子位置,温度因子,择优取向)4. 数据导出与处理 1.软件下载与安装主页/solution/gsas/下载地址:ftp:///public/gsas//ccp/ccp14/ftp-mirror/gsas/public/gsas/ftp:///ccp14/ftp-mirror/gsas/public/gsas/http://ccp14.sims.nrc.ca/ccp/ccp14/ftp-mirror/gsas/public/gsas/ 作者编写了非常详细的使用说明文件:GSASManual.pdf,可以从网上下载:ftp:///public/gsas/manual/GSASManual.pdf./ccp/ccp14/ftp-mirror/gsas/public/gsas/manual/GSASManual.pdf EXPGUI可以运行在多种平台:Windows,Mac,UNIX,Linux,SGI。在Windows操作系统下面只要运行gsas+expgui.exe,按照提示就可以顺利完成安装。 2. 数据导入与模型建立2.1 格式转换GSAS可以处理中子衍射(飞行时间数据和固定波长数据)和X射线衍射。关于中子衍射可以参考GSASManual的实例,也可以随时随地按F1获得在线帮助。我们主要演示X射线粉末衍射数据的Rietveld拟合。 由于不同的衍射仪公司都有自己的数据格式,因此我们必要把不同公司的数据格式转换为GSAS的数据格式。Powder4程序可以完成数据转化。用Powder4打开衍射数据,然后保存为Gsas CW ESD 格式。2.2 结构模型下面以高温超导体YBa2Cu3O7-x为例讲述GSAS精修过程。YBCO的晶体结构如下所示,我们一步一步的建立这个结构模型。
①1001英语②2281材料物理③3281材料化学
全文共3篇示例,供读者参考
篇1
Materials science is a field that encompasses the study of
materials, their properties, and their applications in various fields
such as physics, chemistry, and engineering. In this document,
we will explore three specific areas of materials science: 1001
English, 2281 Materials Physics, and 3281 Materials Chemistry.
1001 English is a course that focuses on the language and
literature of the English-speaking world. Students in this course
will study a variety of texts, ranging from classic works of
literature to contemporary pieces of writing. Through the study
of these texts, students will improve their reading, writing, and
critical thinking skills. Additionally, students will learn about the
history and development of the English language, as well as its
微型钛板在颈椎后路椎板成形中的应用:近期随访
谢柏臻;华强;赵慧毅
【摘 要】BACKGROUND:During cervical posterior expansive open-door
laminoplasty for multisegmental cervical spondylosis, spinal canal
restenosis, loss of cervical lordosis, and axial symptoms are the important
factors affecting curative effects. It is very necessary to maintain spinal
canal expanded state and to reduce interference of the posterior cervical
structure in the clinical treatment. OBJECTIVE:To observe clinical outcomes
and short-term fol ow-up effect of posterior expansive open-door
laminoplasty via titanium miniplate in treatment of cervical spondylotic
myelopathy. METHODS:A total of 67 patients with cervical spondylotic
myelopathy who underwent posterior expansive open-door laminoplasty
at the Zhongshan Hospital, Xiamen University from April 2006 to April
2013 were retrospectively analyzed. Titanium miniplate group (n=27)
材料物理习题集
第一章 固体中电子能量结构和状态(量子力学基础)
1. 一电子通过5400V电位差的电场,(1)计算它的德布罗意波长;(2)计算它的波数;(3)计算它对Ni晶体(111)面(面间距d=2.04×10-10m)的布拉格衍射角。(P5)
12341311921111o'(2)6.610 =(29.11054001.610) =1.67102K3.7610sinsin2182hhpmEmdd解:(1)=(2)波数=(3)2
2. 有两种原子,基态电子壳层是这样填充的
;;sssssss2262322626102610(1)1、22p、33p(2)1、22p、33p3d、44p4d,请分别写出n=3的所有电子的四个量子数的可能组态。(非书上内容)
3. 如电子占据某一能级的几率是1/4,另一能级被占据的几率为3/4,分别计算两个能级的能量比费米能级高出多少kT?(P15)
1()exp[]11ln[1]()()1/4ln3()3/4ln3FFFFfEEEkTEEkTfEfEEEkTfEEEkT解:由将代入得将代入得
4. 已知Cu的密度为8.5×103kg/m3,计算其E0F。(P16)
2203234262333118(3/8)2(6.6310)8.510 =(36.0210/8)291063.5 =1.09106.83FhEnmJeV解:由
5. 计算Na在0K时自由电子的平均动能。(Na的摩尔质量M=22.99,.033=11310kg/m)(P16)
220323426233311900(3/8)2(6.6310)1.01310 =(36.0210/8)291022.99 =5.21103.2531.085FFhEnmJeVEEeV解:由由