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Perovskite solar cells typically have a methylammonium lead iodide (CH3NH3PbI3) structure.
Lead (II) thiocyanate (Pb(SCN)2, 99.5% purity) was purchased from Aldrich chemistry.
Crystal structures of the prepared perovskite films were studied by using XRD measurements, and the results are shown in Fig. 1.
The three main peaks at 2q = 14.10°, 28.40°, and 31.82° could be indexed to the (110), (220), and (310) planes of tetragonal perovskite structure [10].
However, the films tended to consisted of two perovskite phases with the mixed I- and Br- ions in perovskite structure.

The interconnection between their composition, structure and properties is also established.
Composition and structure of polymers were studied by methods of IR-spectroscopy, the element analysis, turbidimetric titration and X-ray crystal analysis.
It would seem, the presence of such substituens has to debond the polymers structure and do them more vulnerable for severe medium.
Certainly, the debonding takes place, however, in this case the shielding effect probably prevails over transmission of amorphous structure.
Deformation and Strength Characteristics of Fatty Aromatic Block Copolymers Based on Polycarbonate // Fibre Chemistry, 2018, 49 (6), рр 420-424. https://doi.org/10.1007/s10692-018-9912-4

The FTIR spectra of hydrogels were shown crosslinking occurs between acrylamide and acrylic acid and pores structures in the hydrogel observed by using SEM.
HSA is essentially a cross-linked polymer which ability to absorb water hundreds of times of their dry weight, insoluble in water because of the 3-dimensional structure of the polymer network [1].
Therefore, It is expected that the new of HSA with improve structure and performance can be developed by the effective combination of AAM-AA with NaAlg via gamma irradiation technique.
Poly(AAM-co-AA)-NaAlg based superabsorbent are ionized hydrogels, in that their swelling behavior depends on both the characteristics of the chemical structure and the swelling medium.
The SEM of hydrogel containing 0.1% NaAlg, shows macroporous with large number of pores of larger size structure (Figure 7).

The crystal structure of the well-aligned CMCs reveals the increase in the (002) peak in XRD spectrum for the aligned carbon microcoils, indicating the existence of the more regular structure in the aligned carbon microcoils.
The crystal structure of the well-aligned CMCs was investigated and compared with the partly-aligned CMCs and the randomly-grown carbon nanomaterials.
The crystal structures of samples having ACMCs (sample C), carbon nanofilaments (sample B), and loose CMCs (sample D) were investigated using XRD.
Based on the results of XRD data, it is confirmed that the samples formed by ACMCs have a more regular crystal structure compared with the samples formed by carbon nanofilaments or by loose CMCs.
Based on the results of XRD data, it is confirmed that the samples formed by ACMCs have a more regular crystal structure compared with the samples formed by carbon nanofilaments or by loose CMCs.

Corrosion behavior of Zr53.5Cu26.5Ni5Al12Ag3 bulk amorphous alloy in 3.5% NaCl Solution Yun Li1，Shi-zhi Shang1，Ming Cheng2*，Liang Xu1，Shi-hong Zhang2 1Shenyang University of Chemical Technology, Institute of applied chemistry, Liaoning, Shenyang 110142, China 2Institute of Metal Research, Chinese Academy of sciences, Liaoning, Shenyang 110016, China * mcheng@imr.ac.cn Keywords：Zr53.5Cu26.5Ni5Al12Ag3 bulk amorphous alloy; Polarization curve; Corrosion behavior; EIS Abstract.
The results of EIS test indicate that Zr53.5Cu26.5Ni5Al12Ag3 bulk amorphous alloy has the excellent corrosion resistance because passive film with stable structure formed on the surface in 3.5% NaCl solution.

The crystal structure model is shown in Figure 1.
Therefore, in this paper, the crystal structures of Ag3Sn, AgZn3 and Ag5Zn8 are geometrically optimized first, and the stable structure corresponding to the lowest energy is obtained.
Electronic structure.
Ag3Sn has the strongest alloying ability, the most stable structure and the most unstable AgZn3 structure
Journal of Physical Chemistry, 1992, 96 (24): 9768-9774

GIBCOtm (USA). 3T3 cells (mouse embryonicfibroblasts) are kindly provided by Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.
As seen from Figure 2 a, collagen gel shows silk-membrane structure.
Fibers and mesh structure can be seen in FSEM photos, but this structure in collagen-gel is not clear.
Some fibers connect to each other to form membrane structure.
Meanwhile, fibers have rod like structure.

Investigating the creep of lightweight arbolit concretes greatly affecting the performance of bearing and envelope structures draws a special attention during the last years.
Both effects were observed in sulfur-containing arbolits of dense structure and their impact in the materials with porous or coarse-pored structure (the average density of 550-650kg/m3) is manifested at a lesser extent or inessential and could be ignored.
The study of structure formation and mechanical strength properties of sulfur-containing woodcrete composites exposed to permanently acting loads.
Isakulov, Detoxication of by-products of oil and gas industry accompanied by obtaining iron and sulfur-containing binders for structural building materials, News of the National Academy of sciences of the Republic of Kazakhstan-series chemistry and technology. 6 (2020) 65-72.
Physico-chemical processes of structure formation in building materials from mineral waste industry.

Study of clay ceramic hollow sphere structure and surface morphology revealed that all samples have spherical shape.
HS structure provides useful properties such as high surface area, low density and the hierarchical porous structure [7].
Wang, Facile synthesis of well-defined CeO2 hollow spheres with a tunable pore structure, Ceram.
Yuan, Porous silica ceramics with closed-cell structure prepared by inactive hollow spheres for heat insulation, J.
Scheffler, eds., Cellular Ceramics: Structure, Manufacturing, Properties and Applications, WILEY-VCH Verlag, Weinheim, 2005

However, building sound models requires suitable parameters related with chemical structures.
Amino acid descriptors are often used to describe the structures of peptides.
Leo, Exploring QSAR: fundamentals and application in chemistry and biology.
Sneath, "Relations between chemical structure and biological activity in peptides," J.
Li-Chan, "Quantitative Structure−Activity Relationship Study of Bitter Peptides," J.