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The XRD patterns of the spinel structure compounds heated at 1000 °C for 10 h are shown in Fig. 1 (1), (4) and (5).
The XRD data clearly confirm the crystalline spinel structure of cobalt ferrite (CoFe2O4) to be the main crystalline component (PDF [22-1086]).
According to the XRD analysis, a fully crystallized single-phase oxide YFeO3 with well pronounced perovskite crystal structure has formed (PDF [39-1489]).
This observation let us to conclude that the proposed simple sol-gel chemistry approach could be used for the preparation of variety crystal structure compounds.
The most interesting fact is that monophasic different structure compounds have been successfully obtained by this method using the same synthetic parameters.

As a kind of metastable defect structure compound, γ-Fe2O3 is sensitive to temperature, and easy to be transformed to α-Fe2O3 of emery structure [14], thus its wave absorption ability is declined.
The crystal structure of the composite materials was studied by X-ray diffraction (XRD) using Cu Kα radiation (λ=1.5205Ǻ, model XRD-6000).
The increase of temperature turns γ-Fe2O3 of metastable defect spinel structure into non-magnetic α-Fe2O3 of emery structure [17, 18].
Jia and Q.Y.Zhang: Chines Journal of Applied Chemistry Vol.26 (2009), p 495.
(in Chinese) [9] L.X.Liu, Y.A.Huang, Y.Sh.Huang et al.: Chinese Journal Inorgnid Chemistry Vol.123(2007), p 1667.

Its structure compositions are solid particles and particle pores which are mutual connection.
The research showed that the spatial distributions of pore structure are statistical self-similarity.
Usually, porous medium is influenced by the interaction of external stress and internal stress, and its microscopic pore structure changes with effective stress.
Chemistry in nonintegral dimensions between two and three.
Porosity and absorption Isotherms, in The Fractal Approach to Heterogeneous Chemistry [M].

Significant changes in the structures of three-component systems can be explained as follows.
This results in opening of the ER oxyran cycle and formation of a 3D epoxysilicate structure [4].
Fig. 3 are illustrates the BEB-based coating structure modified by copper epoxysilicate depending on the type of mixing.
Glass Physics and Chemistry 38 (1) (2012) 172-179
Ahmad, Vegetable oil based eco-friendly coating materials: A review article, Arabian Journal of Chemistry 7 (4) (2014) 469-479

And the breaking molecules combined with higher content of oxygen structure of algae to form the phenolics [13].
It can be seen that the asphaltene fraction has great abundant of phenols, aliphatic structure and polycyclic aromatic hydrocarbon, etc.
(4) With the increasing of algae added, hetero atomic structure formed in the asphaltenes of low-temperature tar.
Upgrading of coal-tar pitch in supercritical water, Journal of fuel chemistry and technology, 2008,36(1):1-5
Reaction property of coal tar and its fractions in supercritical water, Journal of fuel chemistry and technology, 2008,36(6):653-659

SEM investigation indicated that the typical crystal structure could not be investigated from the as-prepared products, and the particles were badly agglomerated.
The electrochemical performances of LiMn2O4 materials were attributed to their phase structure, chemical composition, and phase homogeneity, as well as micro morphology, crystallite size, and so on [2, 3].
The effect of acetic acid content on the phase structure was investigated in details.
It can be gotten from Fig.4 that the typical crystal structure could not be investigated from the as-prepared products, and the particles were badly agglomerated.
Acknowledgements The present work was supported by the National Natural Science Foundation of China (No.51062018) and by the Key Subject of Materials Physics and Chemistry of Honghe University.

It is found that NbN crystallized cubic structure and also have hexagonal structure experimentally [5].
The mechanical properties and electronic structures of the five different structures of NbN are studied: NaCl structure (Fm-3m); CsCl structure (Pm-3m); ZB structure (F4-3m); hexagonal structure (δ) (P63/mmc) and tungsten-carbide-like structure (ε) (P-6m2).
Fig. 3 Total and local DOS for NbN in (a) the NaCl structure at P = 0, (b) the NaCl structure before the transition (P < PT ), (c) the CsCl structure after the transition (P > PT ), (d) the CsCl structure at P= 0, (e) the δ-NbN at P = 0, and (f) the ε-NbN at P = 0.
It is also found that the phase transition pressure from NaCl structure to CsCl structure are 290GPa.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China under Grant No. 11047151, the Henan Research Program of Basic and Frontier Technology under Grand No. 102300410213, and the Scientific Research Foundation of Luoyang Normal University under Grant No. 2010-QNJJ-003,10000855 and 10000890. the Open Research Found of State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology under Grant No.

Doping Effect on Crystal Structure of Fast Oxide Ion Conductor LaGaO3-Based Perovskite Compounds Masahiro Kajitani 1, Motohide Matsuda 1, Akinori Hoshikawa 2, Takashi Kamiyama 3, Fujio Izumi 4 and Michihiro Miyake 1 1 Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, Okayama 700-8530, Japan 2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan 3 Institute for Materials Structure Science, High Energy Accelerator Research Organization, Tukuba, Ibaraki 305-0801, Japan 4 Advanced Materials Laboratory, National Institute for Materials Science, Tukuba, Ibaraki 305-0044, Japan Keywords: Lanthanum Gallate, Oxide Ion Conductor, Doping Effect, Perovskite, Neutron Diffraction ABSTRACT Doping effects of Sr and/or Mg on the crystal structures of LaGaO3 perovskites were investigated.
Although several authors have studied the crystal structure of LSGM [4-5], the doping effects of Sr and/or Mg on the crystal structures still remain unclear.
Table 1 indicates the crystal structures of LaGaO3 solid solutions.
Therefore, the crystal structure of LGM82 was re-examined.
These structures were distorted with GaO6 octahedral tilt.

Based on the XRD measurement, it was revealed that ZnO films were polycrystalline with hexagonal wurtzite structure.
Introduction Zinc oxide (ZnO) is an n-type II­VI semiconductor with hexagonal wurtzite structure.
This difference is due to the fact that the values of Eg depend on many factors e.g. the granular structure, the nature and concentration of precursors, the structural defects and the crystal structure of the films.
Zou, Journal Physic Chemistry,111 (2007) 17521 [2] Z.L.
Manoj, Material Chemistry and Physic 93, (2005)194 [12] D.

Synthesis and Electrochemical Properties of Macro-/Microporous Carbon Foams Wei Xiong1, Mingxian Liu2, Lihua Gan1*, Xiaogang Wang1, Zijie Xu1, Zhixian Hao1, Honglai Liu2 and Longwu Chen1 1Department of Chemistry, Tongji University, Shanghai 200092, P.
China; 2State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P.
The MMCFs possess hierarchical pore structure of macropores and micropores, which benefits to the access of electrolyte solution through pores to the large surface of MMCFs electrode.
The hierarchical pore structure decreases the diffusion resistance of electrolyte and promotes the ion transfer within the pore channel, and thus improves the electrochemical properties of MMCFs.
MMCFs with hierarchically pore structure are beneficial for ionic transportation within the pore channels, and thus the electrochemical properties were improved.