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Online since: July 2020
Authors: Mohamed Hasan Darweesh, Nihad Ali Shafeek, Shahir Fleyeh Nawaf
XRD used for study structure properties, a computer program was used to calculation of spike dimensions the lattice parameters a, b and c shows Tetragonal, Electrical resistivity at x= 1.5 of Ba are obtained when the best value of Tc= 142 K.
The superconducting B-S-C-C-O has an orthorhombic structure [3], they consist of provskite copper oxide planes sandwiched between double bismuth oxide layers with rock salt coordination, and have been compared to the Aurivillins phase[4,5].This body-centered orthorhombic Braveries lattice is only an average structure, however as the compounds display incommensurate modulation[6].
The results of XRD patterns for bulk present Tetragonal Structure. 2.
[11] Ye Zhu, Tem Characteracterization of Microstructure and Chemistry in Magnesium Diboride Superconducter, A Doctor of philosophy (Materials Science ) dissertation University of Wisconsin – Madison ,2008
Kaya, and Dincer, Effects of Nickel Substitution on Crystalline Structure and Superconducting Properties of YBa2Cu3O7− δ Ceramics.
Online since: September 2013
Authors: Xian Lun Deng, Hao Guo
The layer of polyphosphate was formed over the developing porous structure, to avoid further inter-action with steam that would cause excessive burn-off.
The pore structure of activated carbon is generally characterized in term of the pore size distribution.
Potassium carbonate-impregnated sample shows a better developed porous structure than the non-impregnated sample.
For the reason of potassium phosphate-impregnated sample can protect the product from excessive burn-off, the porous structure exhibits well pronounced array like honey-combed structures.
[11] Sing K S W, Everett D H, Haul R AW: Pure and Applied Chemistry, Vol. 57 (1985), p. 603-619
Online since: January 2012
Authors: T. Srinivasa Rao, S. Kumaran, M. Thirumurugan, Rengasamy Selvaraj
Meanwhile, previous experimental studies showed that the BCC structure has more room for hydrogen accommodation in the lattice, because the BCC structure possesses lower density than the conventional hydrogen absorbing alloys that have usually closer packed structures [3].
The metastable BCC structure for Mg-Tm-V (Tm= Ni, Co, Cu) immiscible system was synthesized by MA and the maximum hydrogen storage capacity reached 2.3 wt.% at 298K and 3 MPa hydrogen pressure [4].
Their structures and hydrogen storage properties were investigated.
Strom-Olsen, Structure, catalysis and atomic reactions on the nano-scale: a systematic approach to metal hydrides for hydrogen storage, Appl.
A: Materials Science & Processing. 80 (1) (2005) 173. 3) Hao Gu, Yunfeng Zhu, Liquan Li, Structures and hydrogen storage properties of Mg95Ni5 composite prepared by hydriding combustion synthesis and mechanical milling, Materials Chemistry and Physics. 112 (2008) 218–222. 4) Hai-Liang Chu, Yao Zhang, Li-Xian Sun, Qi-Feng Tian, Fen Xu, Tao Zhang, Hua- Tang Yuan, Structures and Hydrogen Storage Properties of Mg45M5Co50 (M=Zr, Ni, Al) Ternary Alloys by Mechanical Alloying, Int.
Online since: January 2005
Authors: György Kaptay, Tamás Bárczy
Kaptay 2 1,2 Physical Chemistry Department, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary Keywords: infiltration, penetration, porous bodies, powder, threshold pressure, threshold contact angle, Carman equation Abstract.
The CPES structure is the same as that of the fcc crystal (see Fig. 1).
The CPES model The CPES (closely packed, equal spheres) structure (see Fig. 1.) is the same as that of the fcc crystal [3].
This structure is more similar to real ceramics structures compared to the capillary model, therefore we can determine approximated infiltration conditions for some real, industrial processes, such as casting of alloys or metal matrix composites.
The penetration front is not planar, what is due to the inhomogeneous structure of powder.
Online since: July 2015
Authors: Noorsuhada Md Nor, Soffian Noor Mat Saliah, Muhammad Izzahan Jamaludin
It can be used as a self-cleaning material in order to maintain the surface condition of the structure especially on reinforced concrete structure which is highly exposed to aggressive environment.
The application of TiO2 in such structure can be implemented by a generic study of its performance such as inclusion of TiO2 in the mortar and concrete.
Although the strength of the TiO2 is lesser than control specimen, this study is vital as the inclusion of TiO2 in the mortar can be used for the structure appearance where it gains brighter feature of the structure’s surface.
For future research, the TiO2 mortar will be applied in the reinforced concrete structure to investigate the performance of the surface that relates to the self-cleaning structure.
Victoria, “Surface and electronic structure of titanium dioxide photocatalyst,” Journal of Physical Chemistry B., vol. 104, pp. 9851-9858, 2000.
Online since: January 2013
Authors: Zhao Qing Lu, Qiang Xu, Zhen Wu, Zhi Jie Wang
Paper treated by hot pressing can make the paper made from aramid pulp transform glass state into the structure of rubber state.
After that, polyimide fibers can bond to form the structure that can receive the whole stress, thus it improved the intensity of paper.
The most important reason is that paper structure was compressed along with the increase of pressure.
Polyimide-chemical, structure and properties of relations and materials. science press, Beijing, 2006
High temperature resistant polyimide structure adhesive modification research progress, J.
Online since: August 2019
Authors: A. Irma Suryani, Iwan Dini, Muharram Muharram, Maryono Maryono
From the basic structure of the molecule, this compound is found in the form of a pair of enantiomers as optically active namely; (-) - Usnic acid and (+) - Usnic acid.
Compound 2 was measured by melting point with kruss M5000 melting point, elucidation of the structure by Shimadzu FT-IR spectrophotometer prestige-21 KBr plate, 500NMR spectrometry Agilent (1H at 500 MHz and 13C at 125 MHz).
Results and Discussion Structure elucidation; Compound 2 (Fig. 1) obtained as solid yellow crystals, melting point 198-200oC.
European Journal of Pharmaceutical Sciences, 6, 141–144, [4] Sassa and Masayuki Igarashi. (1990) structures of (-)-mycousnine, (+)-isomycousnine and (+)-oxymycousnine, new usnic acid derivatives from Phytopathogenic.
Bioorganic & Medicinal Chemistry, 16 (14), 6860-6866, [10] B.N.
Online since: September 2013
Authors: Hai Feng Li, Mu Huo Yu, Xin Da Li, Magdi E. Gibril, Xuan Zhong, Huan Li, Yue Zhang, Ke Qing Han
Pure PEG2000 shows spherulites with typical maltese cross pattern (Fig. 1f) which indicated the crystalline structure for PEG.
It suggested that increase of brightness is a result of the birefringence of the PEG crystalline structure.
The new peak at 19.73o is the characteristic of cellulose-II crystalline structure [5].
G.Wu, Dissolution of cellulose with ionic liquids and its application,Green Chemistry, 8 (2006), 325-327
Cai, Huihui Guo, Qinghua Shao, Huili Hu and Xue chao, Structure and Properties of Cellulose Fibers from Ionic Liquids, J.
Online since: December 2010
Authors: Shao Min Lei, Jing Ya Gui, Fang Li Lv, Ming Wen, Shui Lin Zheng, Zhi Ming Sun, Chun Hua Bai
TiO2 had perfect crystal structure.
The structures of them are the following.
The formula of Direct Blue 5B: The formula of Direct Purple N: The structural formulas showed that both of them contained the coloring structure units like as—N=N—,—SO3Na and polar group—OH,—NH2.
TiO2 had perfect crystal structure.
Jiang: Chinese Journal of Applied Chemistry(China). 20, 73(2003) [7] M.
Online since: July 2020
Authors: Lim Kean Pah, Soo Kien Chen, Shaari Abdul Halim, Noor Baayah Ibrahim, Lik Nguong Lau, Mohd Mustafa Awang Kechik, Sin Yin Lai
All samples are in LCMO phase having an orthorhombic structure with space group Pnma.
Besides that, Liu et al. proposed that this outcome is caused by the substitution of Ti ions with Mn ions in the LCMO lattice and it can’t be detected from XRD analysis as the deformations are random and X-ray could only detect mean lattice structure [4].
From the results shown by lattice parameter, bond length and bond angle, it indicates that adding TiO2 into LCMO system does not modify the crystal structure of LCMO as reported by previous study [4].
Rietveld refinement data of pure LCMO and LCMO: TiO2 composites Sample Lanthanum Calcium Manganate Crystal Structure Orthorhombic Space group Pnma (62) TiO2 Composition, x 0.00 0.05 0.10 0.15 0.20 Lattice Parameter a (Å) 5.450 5.455 5.453 5.454 5.455 b (Å) 7.704 7.707 7.704 7.706 7.724 c (Å) 5.471 5.477 5.477 5.474 5.458 Bond Angle ∠Mn-O1-Mn (°) 162.574 162.580 162.581 162.578 162.543 ∠Mn-O2-Mn (°) 161.150 161.136 161.129 161.141 161.236 Bond Length Mn-O1 (Å) 1.931 1.933 1.932 1.932 1.930 Mn-O1 (Å) 1.976 1.978 1.977 1.977 1.974 Mn-O2 (Å) 1.952 1.953 1.953 1.953 1.957 Mn-O2 (Å) 1.952 1.953 1.953 1.953 1.957 REXP (%) 4.623 4.415 4.643 4.695 4.622 RP (%) 3.532 3.508 3.930 4.144 4.128 RWP (%) 4.636 4.603 5.040 5.537 5.423 Goodness of Fit 1.006 1.087 1.179 1.413 1.377 Sample Titanium Oxide (Rutile) Crystal Structure Tetragonal Space group P42/mnm (136) Lattice Parameter a (Å) - - 4.585 4.596 4.592 b (Å) - - 4.585 4.596 4.592 c (Å) - - 2.953 2.951 2.955 The magnetic properties of samples
Bhattacharyya, Enhanced Low-Field Magnetoresistance in La0.71Sr0.29MnO3 Nanoparticles Synthesized by the Nonaqueous Sol–Gel Route, Chemistry of Materials, 26 (2014) 1702-1710