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The X-ray diffraction (XRD) pattern confirmed that the Fe3O4 microspheres belong to cubic structure.
Results and Discussion Structure of the sample.
This indicates that the as-synthesized sample is pure Fe3O4 phase with cubic structure.
They are pure Fe3O4 phase with cubic structure.
Ni: Progress in Chemistry Vol. 21 (2009), p. 880 [3] Q.

The effects of different NH4Cl flux concentrations on the crystal structure, morphology, and photoluminescent performance was investigated.
The crystal structure of the products was identified by XRD with a diffractometer (Rigaku D/max-2500/pc, Japan).
The main phase is matched well with the standard card No.08-0464 CaS as reference, and the XRD peaks correspond to face-centered cubic structure.
The influences of NH4Cl flux concentrations on the crystal structure, morphology and photoluminescent properties of CaS:Eu2+ phosphors was investigated.
Acknowledgments This work was financially supported by the National Natural Science Foundation of China under Grant nos. 21076161, 50802062, and 50872091 and Tianjin Key Discipline of Materials Physics and Chemistry under Grant no. 10SYSYJC28100.

A corundum-type structure of cobalt niobate (Co4Nb2O9) has been synthesized by a solidstate reaction.
The crystal structure of Co4Nb2O9 ceramic is known to have a corundum-type structure.
In the HCP crystal structure, as in the FCC structure, there are as many octahedral interstitial sites as there are atoms in the unit cell.
Thus far, although Co4Nb2O9 is identical in stoichiometry to Mg4Nb2O9, it has not been synthesized to the corundum-type structure.
Summary The corundum-structure, Co4Nb2O9, was synthesized by solid state reaction using oxides as starting materials.

The cross section structure of hydrogels was observed with a field-emission scanning electron microscope (FESEM, HITACHI S-4800).
Results and Discussions Structure and Morphology of Hydrogels.
The swelling-deswelling curve also indicated the repeated swelling and shrinking didn't damage the internal structure of hydrogels.
Zhu, Fabrication of pH-sensitive graphene oxide–drug supramolecular hydrogels as controlled release systems, Journal of Materials Chemistry. 22(2012) 24856-24861
Guo, Reactive macromolecular micelle crosslinked highly elastic hydrogel with water-triggered shape-memory behaviour, Polymer Chemistry. 5(2014) 4965-4973

The both ends of the molecular structure of the synthesized UV-curable sealant include two C=C bonds which belong to π-electronic structure.
The XRD of PANI (a) and PANI/ITO nanocomposites (b).Synthesis and molecular structure of the UV-curable sealant.
Most of the structure is conglobation that is the ITO enwrapped by PANI during the polymerization.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)

The structure of ZBB glasses consists of randomly connected BO3 and BO4 groups.
No boroxol ring formation was observed in the structure of these glasses.
The structure of present glass system is independent of change in composition.
Solid State Chemistry, Vol. 183,(2010), p. 3078-3085 [11] I.
Aggarwal, Materials Chemistry and Physics, Vol. 1339, (2012), p. 151-158 [12] Krogh-Moe, Phys Chem.

The electrochemical performance of nanostructure TiO2 for LIBs The crystal structure of TiO2 in natural environment So far, there are four crystal structures of TiO2 in natural environment.
Mesoporous TiO2 nanomaterial for LIBs Mesoporous material is the ideal one which could meet those requirements for LIBs due to its porosity structure.
It is thought that the porosity structure in mesoporous material could promote rapid ion migration and thus enhance the chemical react kinetics [22].
Graphene is a 2-D sheet of carbon atoms with a honeycomb structure which excellent electronic conductivity and mechanical properties.
Vol. 22 (2010), p. 1908 [67] Xiaomeng Wu, Shichao Zhang et,al.: Journal of Material Chemistry Vol. 22 (2012), p. 11151 [68] Sukeun Yoon, Arumugam Manthiram.: J.Phys.Chem.C.

The basic unit of the frame structure consists of two octahedrons and three tetrahedrons(Zr2P3O12).
Phase structure of CaZr4(PO4)6 powders was analysed by D/MAXIII type X ray diffractometer.
As can be seen from fig. a, the internal structure of the material is loose and there is a large number of pores.
Sleight, Negative Thermal Expansion in a Large Molybdate and Tungstate Family, Journal of Solid State Chemistry. 133(1997)580–583
[16] J.Z.Tao, A.W.Sleight, The role of rigid unit modes in negative thermal expansion, Journal of Solid State Chemistry. 173(2003)442-448

However, the precipitates with the feature of D019 type structure were not observed.
References [1] L.L.Rokhlin, Magnesium Alloys Containing Rare Earth Metals Structure and Properties, in:J.N.
Litynska, Materials Chemistry and Phisics. 80 (2003) 472-475
Arrowheads and dashed circles indicate the monolayers and precipitates with D019 structure, respectively.
Arrowheads and dashed circles indicate the monolayers and precipitates with D019 structure, respectively.

The optimal sintering temperature of KNN ceramics is 950°C, and the main phase is orthorhombic structure.
With the increase of Ta5+ substitution, the structure had been changed obviously.
All the showed that Ta5+ had diffused into the KNN lattice to form a new solid solution and the transition point from orthorhombic structure to the two-phase coexist structure was x= 0.08.
The anisotropy of the lattice enhanced and formed a diphase coexistence structure in the ceramics.
When x≥0.08, the physical phase of the samples became the two-phase coexistence structure.