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Carbonate hydroxyapatite is a substitution of carbonate ions in phosphate sites of the hydroxyapatite (HA) structure [5].
The characterized morphological structure of pectin and pectin-CHA edible films are depicted in Fig. 1.
Morphological structure of (a) pectin edible film and (b) pectin-CHA edible film Mechanical properties.
Sriamornsak, Chemistry of pectin and its pharmaceutical uses: a review, Silapkorn Univ.
Majeed, Chemistry and bioactivity of cinnamaldehyde: a natural molecule of medicinal importance, Int.

Visible-light Driven FeS2 Nanosized Photocatalysts Prepared by Solvothermal Method He Suna, Peisong Tangb Department of Chemistry, Huzhou Teachers College, Huzhou 313000, P.R.
The results show that FeS2 is the cube structure, particle size about 90 nm, band gap energy Eg=1.9 eV.
All peaks can be indexed to the typical cubic structure FeS2 (JCPDS card #: 65-1211).
It means the cubic structure FeO2 by solvothermal method has been prepared successfully.
Jian: Hydrothermal Synthesis and Crystal Structure of Pyrite.

Advances in computation of temperature-pressure phase diagrams of high-pressure nitrides Peter Kroll Department of Chemistry and Biochemistry, The University of Texas at Arlington 700 Planetarium Pl., Arlington, TX 76019-0065, USA.
A ReN2 with CoSb2-type structure may be achieved at pressures exceeding 50 GPa at this temperature.
All structures are optimized so that individual residual forces are below 10-3 eV/Å.
This structure type has also been found to be the lowest energy modification of a (hypothetical) PtN.
This CoSb2-structure type was recently proposed for the lowest energy modification of IrN2, but also as a high-pressure structure of OsN2.

The XRD patterns of all the materials are matched to the ICDD reference pattern number 01-089-2810 which is α-Fe2O3 rhombohedral structure with space group R-3c.
Pure rhombohedral structure of Fe2O3 can be obtained at temperatures of 600 oC giving nanomaterials of Fe2O3.
El-Shahat: submitted to International Journal of Inorganic Chemistry (2010) [9] D.

Wong1 1 Centre of Excellence for Catalysis Science and Technology, 2Department of Chemistry Faculty of Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia a yap@science.upm.edu.my Keywords: V2O5; Sonication; Nanowire; Mineralizer.
XRD patterns of the sonicated V2O5 gave similar structure with a pure V2O5 phase without the presence of other diffraction peaks which attributed to any different phases.
In this study, nanowires V2O5 were synthesized via sonochemical treatment for different lengths of time and the physico-chemical properties of nanowires V2O5 i.e. morphology and structure were characterized by using X-ray diffractometer (XRD) and transmission electron microscope (TEM).

Furthermore, the chemical structure of composite membrane and the anatase-TiO2 crystal structure were characterized by FT-IR spectroscopy and XRD analysis, respectively.
Fig. 1a shows the 3-dimentional porous network structure of pure BC membranes.
The free space presents in the interwoven fibrous structure provides the environment of micro-reactor for the in situ synthesis.
Furthermore, PPy coated TiO2 nanoparticles maintain the anatase-TiO2 crystal structure.
[2] Xiang Q., Yu J., Jaroniec M., The Journal of Physical Chemistry C, 2011, 115(15): 7355-7363

The sintering temperature, main crystal phase, microstructure and fracture mode of the composites synthetized by sintering are different with change of ratio of Al2O3 and SiO2 and content of Al2O3: (1) If the ratio of Al2O3 and SiO2 and content of Al2O3 is low, sintering temperature of the composites is high, the main crystal phase is mullite, microstructure shows interlocking network structure formed by columnar mullite, the fracture mode of composites shows that mullite appears in the pulled out state; (2) If the ratio of Al2O3 and SiO2 content of Al2O3 is high, sintering temperature of the composites is low, the main crystal phase is corundum, microstructure shows the skeleton structure formed by granulous corundumthe, the fracture mode of composites shows intergranular fracture formed by corundum, occasionally transcrystalline fracture.
From the SEM micrographs it can be seen that: Fig.4 The SEM photographs of the sintered samples The microstructure of sintering sample C1(Fig.4a) shows the interlocking network structure formed by columnar mullite, and granulous corundum fills in the interstices of the network structure, and fracture mode of composites indicates that mullite shows the pulled out state; the microstructure of sintering sample C3 (Fig.4c) shows the skeleton structure formed by granulous corundum, and majority fracture of corundum shows intergranular fracture, occasionally transcrystalline fracture can be seen; Compared with sintering sample C3, the microstructure of sintering sample C2 (Fig.4b) is a typical interalternate and filling structure formed by mullite and corundum, mullite appears in the pulled out state and, corundum shows mainly transgranular fracture.
If the ratio of Al2O3 and SiO2 and content of Al2O3 is low, the main crystal phase of the composites is mullite, and its microstructure shows the interlocking network structure formed by columnar mullite, mullite appears in the pulled out state; if the ratio of Al2O3 and SiO2 content of Al2O3 is high, the main crystal phase of the composites is corundum, and its microstructure shows the skeleton structure formed by granulous corundumthe, fracture mode of composites shows intergranular fracture of corundum, occasionally transcrystalline fracture.
Inoue: Materials Chemistry and Physics, Vol. 68(2001), p. 105-109

All of the molecular structures were calculated by Gaussian03.
Take the C5H8O + stable structures as a new structure type, with the CIS method at 6-31 + g (d, p) basis we optimized, then calculated the frequency under the same level, the results pointed out that there is no imaginary frequency, we obtained the structure of the C5H8O+ stable structure, energy: E (CIS) = -268.8559 a.u.
Geometric structure Fig.2 C5H8O+ion ground state stable structures In this section we calculate the theoretical frequency of C5H8O+excited states.
We use C5H8O+ optimum structure as input in the coordinate and the CIS method, the 3-21G * basis sets to calculate the configuration of different excited state vibration frequencies. 
The basic principles of quantum chemistry and ab initio calculation [M].Beijing: Science press, 1985

The unique structure and outstanding properties render graphene highly promising for a wide range of applications in the field of energy storage and energy conversion.
The ratio of D-band to the G-band is s measure of the quality of the graphitic structures[6].
This shows that the quality of the graphitic structures can be improved with the increase of laser power density within limits, and high laser power density may destroy the structures.
The graphitic structures quality of laser covered graphene can be improved with the increase of laser power density within limits, and high laser power density may destroy the structures.
[3] Victor Abdelsayed, Sherif Moussa, Hassan M.Hassan: Physical Chemistry Letters, Vol.01 (2010), p2804

Fig. 2 Chemical structure of betalain pigment.
Fig. 3 Chemical structure of anthocyanin pigment.
Fig. 4 Chemical structure of chlorophyll.
Fig. 5 Chemical structure of beta-carotene.
Moser, Solar Energy Conversion, Electron Transfer in chemistry (Ed.: V.