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The tempered martensite shows different structures due to thermal conditions of the heat treatment [5,9,10].
Fig. 2d presents the structure of the tempered martensite which shows needles-like structures.
It is observed the laths structure of the martensite in quenched sample and the refined needles-like structure of tempered martensite.
The results showed an influence of the tempering in the hardness and structure of the steels.
Llorente: Materials Chemistry and Physics Vol. 126 (2011), p.178.

FITR analysis confirms the chemistry of the superabsorbent polymer of acrylic acid base monomer.
Wet SAP particles are also larger due to the volume occupied by the water within the wet SAP structure, although most of the water could be on the surface structure of SAP.
Interactions of water molecules with SAP structure after absorption.
Figure 11-a shows the nonwoven fibrous structure showing a porous structure consisting by a fiber network.
Flory, Principles of Polymer Chemistry, Cornell University Press, New York, 1953

The synthesis efficiency is discussed from the structure fundaments.
The magnetoplumbite structure of BaM is a result of the perturbation of the big Ba2+ ion on the lattice of the oxygen-closed-packed cubic structures of garnets or spinels.
g-Fe2O3 has the cubic structure similar to the S block in BaM.
Fe3O4 possesses an inversed spinel structure which is a cubic structure.
Also there are blocks of spinel structures in magnetoplumbite structure of barium ferrite.

The chemical structure of the hard segment of PUR was characterized by Infrared (IR) spectroscopy.
Chain extenders play a very important role in PUR structure.
The chemical structure of PUR was characterized by IR technique.
Increasing the chain extender content affects the hard segment in the PUR structure and may increase the hydrogen bonding index, which in turn may enhance crystallization and phase separation of HS in the PUR structure.
Master dissertation, Department of Chemistry, United Arab Emirates University (2005)

The specific surface, morphology, structure and the distribution by size of the particles are presented.
The new properties of the particles are connected not only with the particles’ size, but with their structure, the conditions of the medium in which they are produced, and the method of production.
Bayramov, Features electrical spark dispersion of some metals, Russian journal of applied chemistry, 5 (2003) 771-773

The crystal structure, micromorphology, specific surface area, and pore structure of the samples before and after modification were analyzed with an X-ray diffractometer, scanning electron microscope, specific surface and aperture tester, and infrared spectrometer.
The particle size of the crystal is approximately 0.8 μm to 1 μm in an intact octahedral structure.
The more easily the pores and surface structures were occupied, the higher the extent of grafting reaction with increasing TETA amount.
This phenomenon changed the pore structure of the samples.
Journal of Natural Gas Chemistry, Vol.21 (2012), p.339-343 [6] P.

Structure and Characterization of Fe(III) Complexes with a Square Planar Ligand and the Effect by the Introduction of External Monodentate Axial Ligands T.
Masuda a Department of Applied Chemistry, Graduate School of Engineering Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan a masuda.hideki@nithech.ac.jp Keywords: Non-heme iron, Axial ligands, Spin state, Epoxidation Abstract.
These make us expect to control the electronic structure of iron complexes and the oxidative reactivity.
ESI-mass spectroscopic analysis in methanol solution also supported such a structure.
This structure is quite similar to that of [FeIII (salen)Cl]2, which forms the phenolate bridged diiron complex [5].

(3) The metal oxides fuse together to form the final material whose chemistry and structure depends upon the stoichiometry of the metal oxides present which in our case is perovskite.
(4) (5) (6) The above equations imply that the metal oxides formed during the self combustion process diffuse and fuse together to form the perovskite of the desired chemistry. [11] Two sets of material were synthesized, using the above procedure, by varying the composition of the starting materials, SGSC-A with the Metal nitrate (M(NO3)n :PVA=1 and SGSC-B with the nitrate (NO3)- : PVA=1.
XRD patterns conform to the JCPDS PDF Card No. 54-1293 validating that the La0.8Sr0.2Mn0.8Fe0.2O3 has been successfully synthesized and formed perovskite structure as desired.
XRD patterns conform to JCPDS PDF Card No. 54-1293 confirming the formation of desired the perovskite structure.

Thus, these showed that carrageenan (ƙ, ι and λ) differ in chemical and physical properties although their chemical structures are almost similar.
In this case, ƙ-carrageenan is a highly polar biopolymer due to the presence of hydrophilic hydroxyl groups in its chemical structure [16].
Bui, Structure, Rheological Properties and Connectivity of Gels Formed by Carrageenan Extracted from Different Red Algae Species, Doctoral dissertation, Universite du Maine, 2019
Hassan, Impact of purification on iota carrageenan as solid polymer electrolyte, Arabian journal of chemistry 12(3) (2019) 370-376
Schaffer-Lequart, Characterization of commercial carrageenans by Fourier transform infrared spectroscopy using single-reflection attenuated total reflection, Journal of agricultural and food chemistry 52(25) (2004) 7457-7463

This shows that the structure of the isolate compounds contains methylene and methyl groups, the presence of these groups reinforced by the presence of bending vibrations in the area of ​​1462.04 cm-1 indicates the presence of -CH2- and 1377.17 cm-1 groups for the -CH3 group based on literature found in area 1480-1430 cm-1 and 1395-1340 cm-1.
Continuing identification of the structure of compounds obtained using spectrophotometers GC-MS, 1H-NMR, 13C-NMR, and UV-Vis to ensure the actual structure of the compound.
Yang, Isolation of triterpenic acid-rich extracts from Hedyotis corymbosa using ultrasound-assisted supercritical carbon dioxide extraction and determination of their fictitious solubilities, Journal of Industrial and Engineering Chemistry 48 (2017) 202-211
Atta ur (Ed.), Studies in Natural Products Chemistry, Elsevier2006, pp. 1057-1090