Structural changes of thermally sprayed hydroxyapatite investigated by Rietveld analysis. - Abstract - Europe PMC
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(PMID:8652783)
Jonathan Campbell Knowles
Bonfield W
IRC in Biomedical Materials, Queen Mary and Westfield College, London, UK.
[):639-645]
Journal Article, Research Support, Non-U.S. Gov't, Comparative Study
10.12(96)88715-1
Hydroxyapatite (HA) coatings were prepared by three thermal spraying methods: flame spraying, high velocity oxygen fuel spraying and plasma spraying. The HA was then examined by Rietveld analysis using the General Structure Analysis Software package (GSAS) and the results compared with those for the precursor powder. A comparison between HA before and after spraying showed that all three spraying methods caused a distortion in the unit cell in the form of a unit cell a-axis length decrease and a c-axis increase. Overall unit cell volumes showed a difference between the three thermal methods, with flame spraying and high velocity oxygen fuel methods giving a unit cell volume increase and the air plasma spraying method showing a decrease, compared to the starting powders. The two different starting powders used each showed a high oxygen occupancy for the hydroxyl oxygen. When thermally sprayed, both powders gave a reduction in occupancy, which suggested carbonate substitution for the OH group, but this was subsequently removed when thermally processed. The spraying also formed oxyapatite, indicated both by spectral analysis showing a reduction in the hydroxyl peak and by the hydroxyl oxygen occupancy falling to a level below 0.5. Major differences between the three spraying methods could be seen in the distortion index calculations. The thermal spraying techniques gave an increase in the distortion index, but it was significantly higher for the plasma-sprayed coating.
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CitePeer Related Articlesxrd rietveld analysis - 必应 词典网络分析1.分析Rietveld分... ... ) Rietveld analysis 分析 ) XRD Rietveld analysis 分析 ) Rietveld quantitative phase analysis 法定量分析 ... |必应词典应用准确权威无广告下 载 手 机 版 必 应 词 典体 验 P C 版 必 应 词 典Rietveld分析,Rietveld analysis,音标,读音,翻译,英文例句,英语词典
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-> Rietveld分析
1)&&Rietveld analysis
Rietveld分析
XRD Rietveld analysis showed that such Fe2O3 was a mixture of crystalline γ - Fe2O3 and amorphous Fe2O3.
Fe~(3+)(Cr~(3-))/Fe~(2+)混合离子(M~(3+)/M_(2+)原子比为2:1)共沉淀法制备的Cr_2O_3掺杂量0～14％(质量分数)系列纳米氧化铁XRD Rietveld分析表明全是晶态γ-Fe_2O_3和非晶Fe_2O_3的混合物。
75) alloys has been revealedby means of multi-phase Rietveld analysis.
75）的多相Rietveld分析表明，它是以C15型Laves相ZrM2为主的多相体系、不同M／Zr原子比（M=Nix或Mnl-x）非Laves相合金的出现与丰度和整个合金成分配比中Ni／Zr原子比的变化一致，并与Ni－Zr相图中具有同样Ni／Zr原子比的金属间化合物有相同的晶型。
2)&&XRD Rietveld analysis
XRD Rietveld分析
3)&&Rietveld quantitative phase analysis
Rietveld法定量分析
4)&&acicularFe powder Rietveld method
针状 Fe 粉 Rietveld 分析法
5)&&Rietveld method
Rietveld法
A sample of the Sb 2O 3 which contains both type of cubic Sb 2O 3 and orthorhombic Sb 2O 3 was performed quantitative phase analysis by Rietveld method.
用Rietveld法对含有立方和正交两种晶型的Sb2O3样品进行了定量相分析,该样品含立方晶型和正交晶型的Sb2O3分别为(质量分数)97。
The crystalline structure of hydroxyapatite (HA) powders sintered at different temperatures of 600, 800, 1 000 and 1 200℃ was studied by means of X-ray diffraction and Rietveld method.
采用X射线衍射法和Rietveld法研究了羟基磷灰石(hydroxyapatite,HA)粉末在不同温度下烧结后的晶体结构,并对其进行结构模拟与解析。
The X-ray diffraction (XRD) patterns were calculated analogically by using Rietveld method and the phase content in rare-earth two phase Nd2Fe14B/α-Fe magnet was determined based on standardless quantitative phase analysis.
用Rietveld法模拟计算稀土双相永磁合金Nd2Fe14B/α-Fe的X射线衍射谱(XRD),并根据多相体模型与无标定量相分析法确定各物相的含量。
6)&&Rietveld method
Rietveld方法
For quantitative phase analysis of pure alumina and Al_2O_3-20wt%TiC composite,the Rietveld method was introduced.
Rietveld方法的定量分析具有准确、高效和快捷等优点,此方法适用于复合陶瓷材料的定量分析。
The structure of samples has been investigated using the Rietveld method.
采用沉淀法制备了纳米氧化锌粉体,利用Rietveld方法对所得样品的结构进行了精修,结果显示所得纳米氧化锌为六方结构,空间群为p 63mc,其晶胞参数a=3。
The XDWP was fitted by combining the Rietveld method and Fourier filtering technique, Rietveld structure refinement for PET_2 crystalline phase was done, the unit-cell parameters obtained such as a =(0.
联用Rietveld方法和Fourier过滤技术,首先以标准试样PbSO4的实测X射线衍射全谱图数据进行精修和分离,获得其结晶相结构参数和低本底值。
补充资料：定性分析与定理分析方法
定性分析与定理分析方法
method of qualitative analysis and quantitative analysis
量分生的战争·析，面构‘对各的评，始}来，与非‘心的确掌’数，·。随l科学系统识的分别之间‘是以‘范围又以!范围
一定!质就·，便I这种量方必须·量的}_上。:往往，自觉，析愈.有定，抽象法的)动态争性质的正义与非正义、武器装备性能的优劣、士气的高低、指挥员指挥能力的强弱、军事理论和国防科技的先进与落后等，就是通过定性分析获得的。定量分析，是在定性分析基础上对军事事物的认识进一步深化和具体化。它通常借助数据、公式、图表等形式，对认识对象作量的描述。认识对象的性质不同，所运用的定量方法也有所不同。如对军事领域中的随机性事件的定量分析，就主要用概率统计的方法。在当代，人们对于一些无法确定数量界限的军事事物用指数化的方法将其量化，以增强可比度和对其认识的精确度。
定性分析方法和定量分析方法，自古以来就被人们自觉或不自觉地运用于军事领域。在古代，人们在考察军事事物时，已经在不少场合，既进行定性分析也进行定量分析，并把定性和定量结合起来。如裴松之在《三国志》注中记载说，周瑜在赤壁之战之前分析曹操的实力时曾指出，曹军号称八十万，其实仅有十五六万，再加上长途行军已经疲惫，能参加作战的仅有七八万，并且不习惯南方气候和水战，心中存有狐疑，因此只要得精兵五万，便可挫败之。周瑜既分析了曹军的兵力，也分析了曹军的士气及战斗力，其中既包含了定性分析，也包含了定量分析。古代由于受自然科学发展水平所限，人们对军事事物进行定量分析的手段比较单一，所得结果也欠精确。近、现代，随着自然科学的进步，军事上的定性方法与定量方法都得到进一步发展，尤其是数学的进步及在军事领域中的广泛应用，使得军事上的定量方法趋于多样化和精确化。但这一时期，在一些人中也出现了过分强调对军事现象进行数学上的绝对值的考察，而忽略使用定性方法的必要性的现象，以为只要能够确定某些要素的数学绝对值，就可以指导军事行动，乃至决定成败，表现出了机械性和形而上学性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。}