Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: July 2014
Authors: Eliana Navarro Santos Muccillo, Tatiane Cristina Porfirio
The perovskite CaCu3Ti4O12, with giant electric permittivity, was prepared by a soft chemistry route and by the solid state synthesis technique.
The electric permittivity ranged from11,600 to 27,000 and from 5,000 to 9,000 for specimens prepared by the conventional and the soft chemistry techniques, respectively, and the dielectric losses varied between 0.1 and 1.3 (conventional) and 0.095 and 0.3 (soft chemistry) depending on the sintering temperature.
Introduction The complex oxide CaCu3Ti4O12 (CCTO) has a body-centered cubic perovskite-type structure and has received great attention due to its unusual dielectric properties.
It is generally known that the synthesis technique has large influences on the crystalline structure and final microstructure of sintered materials.
In this work, the CaCu3Ti4O12 polycrystalline ceramic was synthesized by a soft chemistry route, known as cation complexation [11], and its structure, microstructure and dielectric properties were investigated and compared to those of the same composition prepared by the conventional technique of solid state synthesis.
The electric permittivity ranged from11,600 to 27,000 and from 5,000 to 9,000 for specimens prepared by the conventional and the soft chemistry techniques, respectively, and the dielectric losses varied between 0.1 and 1.3 (conventional) and 0.095 and 0.3 (soft chemistry) depending on the sintering temperature.
Introduction The complex oxide CaCu3Ti4O12 (CCTO) has a body-centered cubic perovskite-type structure and has received great attention due to its unusual dielectric properties.
It is generally known that the synthesis technique has large influences on the crystalline structure and final microstructure of sintered materials.
In this work, the CaCu3Ti4O12 polycrystalline ceramic was synthesized by a soft chemistry route, known as cation complexation [11], and its structure, microstructure and dielectric properties were investigated and compared to those of the same composition prepared by the conventional technique of solid state synthesis.
Online since: May 2011
Authors: Da Wei Fang, Xue Jun Gu, Shuang Yue, Yu Liu, Shu Liang Zang
Institute of Rare & Scattered Elements Chemistry, Liaoning University, Shenyang 110036, China
2.
School of Chemistry and Materials Science, Liaoning Shihua University, Fushun 113001, China *Corresponding author: Davidfine@163.com, Slzang@lnu.edu.cn Keywords: Pyridine; Rhenium; ionic liquid; property; structure Abstract.
The influence on physicolchemical properties by molecular structure was discussed.
B Chemistry, 2006, 36 (3): 181~196.
Wang, Chinese Journal of Chemistry, 2010, 28: 179-182
School of Chemistry and Materials Science, Liaoning Shihua University, Fushun 113001, China *Corresponding author: Davidfine@163.com, Slzang@lnu.edu.cn Keywords: Pyridine; Rhenium; ionic liquid; property; structure Abstract.
The influence on physicolchemical properties by molecular structure was discussed.
B Chemistry, 2006, 36 (3): 181~196.
Wang, Chinese Journal of Chemistry, 2010, 28: 179-182
Online since: January 2004
Authors: Håkan Rundlöf, Roland Tellgren, S.A. Ivanov, S.-G. Eriksson
-G.Eriksson 2, R.Tellgren 3, H.Rundlöf 3
1 Karpov'Institute of Physical Chemistry, Moscow, Russia
2 Department of Inorganic Chemistry, University of Gothenburg, Gothenburg, Sweden &
Studsvik Neutron Research Laboratory, Uppsala University, Nyköping, Sweden
3
The Angstrom Laboratory, Materials Chemistry, Uppsala University, Uppsala, Sweden
Keywords: neutron powder diffraction, magnetoelectrics, complex perovskites
Abstract.
The symmetry of different phases is still a matter of discussion and its crystal chemistry is more complicated than expected earlier.
The type of distorted cubic perovskite structure is mainly determined by the A-cation.
The magnetic structure of the title phases consists of two Fe 3+ sublattices alternating in all three directions.
All the compounds have the G-type magnetic structure.
The symmetry of different phases is still a matter of discussion and its crystal chemistry is more complicated than expected earlier.
The type of distorted cubic perovskite structure is mainly determined by the A-cation.
The magnetic structure of the title phases consists of two Fe 3+ sublattices alternating in all three directions.
All the compounds have the G-type magnetic structure.
Online since: October 2014
Authors: Tian Fei Ma, Guo Qi Liu, Feng Ling Yang, Hong Xia Li, Jian Bin Yu, Wen Gang Yang, Fan Qian
The structure of cured phenolic is primarily methylene bridged phenolic units.
Chemical Structure of Cured Phenolic Resins.
Structures of phenolic resins and furan resins are shown in Fig. 4.
Materials Chemistry and Physics, 2011, 129: 228-235
Materials Chemistry and Physics, 2012, 131(2012): 735-742
Chemical Structure of Cured Phenolic Resins.
Structures of phenolic resins and furan resins are shown in Fig. 4.
Materials Chemistry and Physics, 2011, 129: 228-235
Materials Chemistry and Physics, 2012, 131(2012): 735-742
Online since: November 2012
Authors: Ling Na Sun
Porous structures offer the potential to improve the electrochemical properties of LiFePO4.
Goodenough: Chemistry of Materials Vol. 20 (2008), p. 7237
Tarascon: Chemistry of Materials, Vol. 21 (2009), p. 1096 [5] H.
Guo: the Journal of Physical Chemistry C, Vol. 113 (2009), p. 3345 [6] Y.
Jamnik: Chemistry of Materials, Vol. 19 (2007), p. 2960 [9] R.
Goodenough: Chemistry of Materials Vol. 20 (2008), p. 7237
Tarascon: Chemistry of Materials, Vol. 21 (2009), p. 1096 [5] H.
Guo: the Journal of Physical Chemistry C, Vol. 113 (2009), p. 3345 [6] Y.
Jamnik: Chemistry of Materials, Vol. 19 (2007), p. 2960 [9] R.
Online since: July 1996
Edited by: Robert J. Cernik, R. Delhez, Eric Jan Mittemeijer
Part 1 contains contributions dealing with powder diffraction methods, and the larger second part comprises contributions which deal with the application of powder-diffraction methods to specific problems in the physics and chemistry of solids. 1.
Materials. 9.1 Thin Layers. 9.2 Amorphous Materials. 9.3 Metals and Alloys. 9.4 Minerals and Inorganics. 9.4.1 Analysis of Structural Changes. 9.4.2 Determination of Crystal Structure. 9.4.3 Various Analyses. 9.5 Organics. 9.6 Ceramic Supercoductors.
Materials. 9.1 Thin Layers. 9.2 Amorphous Materials. 9.3 Metals and Alloys. 9.4 Minerals and Inorganics. 9.4.1 Analysis of Structural Changes. 9.4.2 Determination of Crystal Structure. 9.4.3 Various Analyses. 9.5 Organics. 9.6 Ceramic Supercoductors.
Online since: July 2015
Authors: Avinash Aher, Suresh Gosavi, Ni Nyoman Rupiasih, Pandit Bhalchandra Vidyasagar
XRD pattern shows the FCC crystal structure of the nanoparticles, orresponding to (111), (200), (220) and (311) faces of gold.
The crystal structure of AuNPs was examined by XRD using BRUKER AXS D8 with Cu-Kα (λ = 1.54 Å), in the range 20-80o.
This shows that AuNPs formed has crystalline structure in accordance with the JCPDS data file no. 04-0784.
This finding agreed with the crystal structure of AuNPs which reported in the literatures [5].
This XRD pattern illustrates that AuNPs formed having FCC crystal structure.
The crystal structure of AuNPs was examined by XRD using BRUKER AXS D8 with Cu-Kα (λ = 1.54 Å), in the range 20-80o.
This shows that AuNPs formed has crystalline structure in accordance with the JCPDS data file no. 04-0784.
This finding agreed with the crystal structure of AuNPs which reported in the literatures [5].
This XRD pattern illustrates that AuNPs formed having FCC crystal structure.
Online since: November 2018
Authors: Volker Döge, Árpád W. Imre
In this work, the authors provide an overview of various rechargeable energy storage battery chemistries and designs, and discuss the charge transport processes related to power capability of the lithium-ion technology.
As shown in Figure 2, the real structure of the active particles within a coated electrode layer is quite diverse in terms of diameter, shape, and orientation.
In general ion pathways within the primary particles can be of 1-, 2- or 3-dimensional kind [7], depending of the active material crystal structure.
Reflecting real 3d structures of electrodes including passive material effects is in focus of actual simulation activities worldwide [11], [12].
Stoklosa, "Modification in the electronic structure of cobalt bronze LixCoO2 and the resulting electrochemical properties," Soilid State Ionics, vol. 36, no. 1-2, 53-58, (1989)
As shown in Figure 2, the real structure of the active particles within a coated electrode layer is quite diverse in terms of diameter, shape, and orientation.
In general ion pathways within the primary particles can be of 1-, 2- or 3-dimensional kind [7], depending of the active material crystal structure.
Reflecting real 3d structures of electrodes including passive material effects is in focus of actual simulation activities worldwide [11], [12].
Stoklosa, "Modification in the electronic structure of cobalt bronze LixCoO2 and the resulting electrochemical properties," Soilid State Ionics, vol. 36, no. 1-2, 53-58, (1989)
Online since: April 2015
Authors: Ahmad Syahroni, Dani G. Syarif, Fitria Rahmawati
Syarif3,c
1Research Group of Solid State Chemistry& Catalysis, Chemistry Department, Sebelas Maret University, Jl.Ir.Sutami 36 A Kentingan, Surakarta 57126
2 Research Group of Solid State Chemistry& Catalysis, Chemistry Department, Sebelas Maret University, Jl.Ir.Sutami 36 A Kentingan, Surakarta 57126
32Lab.
This research aims to study the crystal structure and its conductivity character.
The addition of YSZ into SDC does not change its crystal structure.
However, study on the crystal structure after being combined with YSZ has not been conducted.
This treatment does not change the crystal structure of YSZ or even their cell parameters.
This research aims to study the crystal structure and its conductivity character.
The addition of YSZ into SDC does not change its crystal structure.
However, study on the crystal structure after being combined with YSZ has not been conducted.
This treatment does not change the crystal structure of YSZ or even their cell parameters.
Online since: May 2016
Authors: Natalya V. Ryabchenko, Irene L. Artemieva
The practically useful intelligent system for physical and chemical process modeling should embrace the knowledge of its many subdomains: physical chemistry, organic chemistry and colloid chemistry (Fig. 1).
Organic chemistry adds terminology describing the structure, properties, and reactions of organic compounds and organic materials [2].
Fig. 1 Structure of the intelligent system ontology model.
Artemieva, Multilevel Modular Chemistry Ontology: Structure and Management, First Russia and Pacific Conf. on Computer Technology and App. 2010, pp. 12-17
Amelina, Colloidal chemistry, 2004, pp. 445.
Organic chemistry adds terminology describing the structure, properties, and reactions of organic compounds and organic materials [2].
Fig. 1 Structure of the intelligent system ontology model.
Artemieva, Multilevel Modular Chemistry Ontology: Structure and Management, First Russia and Pacific Conf. on Computer Technology and App. 2010, pp. 12-17
Amelina, Colloidal chemistry, 2004, pp. 445.