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Porous structure formation behavior depends on the crystal structure of clay minerals.
Within the same structure of clay minerals, their resistance to acid also varies.
The acid attack changes the crystal structure of clay and clay minerals.
These minerals have the same type of crystal structure, but their dissolution rates vary depending on the octahedral layer's ionic structure.
Temuujin, Characterization of mica from Bodonchiin gol deposit (Mongolia), Bulletin of the Institute of Chemistry and Chemical Technology, MAS, 7 (2019) 23-27

In the case of high-pressure synthesized MgB2 the Ti-, Zr- or Ta-containing inclusions are rather coarse and too randomly distributed in material matrix to be pinning centers by themselves or to refine the MgB2 structure.
The structure of materials was studied using SEM and X-ray diffraction analyses.
The problem is that it is very difficult to analyze not only the structures of MgB2-based materials, but the initial boron or B-containing powders as well.
Mathematics, Physics and Chemistry 200 (2005) 81-90
Mathematics, Physics and Chemistry, 200 (2005) 81-90.

In order to calculate such a reference value for different production processes, the term Least System Energy Change Demand is defined based on the model of the activation energy in the field of chemistry and on the given circumstances.
This is the only way to identify highly efficient production structures and specific saving potentials that can be a positive example and reference.
Thus, in order to calculate the minimum value, it is necessary to define a calculation system that takes specific influential variables of the production process into account in a structured way.
This includes chemistry, thermodynamics, atomic physics, and material science.
An ideal crystal represents a crystal structure without any deviations from the regular lattice structure (a).

However, the total energy increase and form the unstable structure.
In practice it is difficult to achieve this structure.
Comparing with the defect structure, the value of N-deficient Hf-Si-N solution is 266 Gpa, 288 Gpa, 610 Gpa respectively, which is much higher than the previous defect structure.
Lee: Materials Chemistry and Physics, Vol. 77 (2002) No.1, pp.27-33
Wu: Journal of Solid State Chemistry Vol. 181 (2008), pp.2814-2827

., 153, Khabarovsk, 680042, Russia atehnoinvest-vip@mail.ru; bkonevts@narod.ru; cgosniti@mail.ru Keywords: electric spark of alloying, alloyed layer, rhenium, properties, structure, efficiency.
(The surface is conditionally considered a visible to the naked eye surface, including the layers adjacent to it with altered, in contrast to the base, composition, structure and properties as a result of various types of boundary effects).
Natural reserves of Re are greatest in Chile, but there is only one of the world's largest and most profitable for production Re deposit, discovered in Russia in 1992 (Iturup Island), where Re is in the form of ReS2 reniite with a structure similar to molybdenite.
It is happens due to the sticking of electrodes and the formation of a secondary structure in AL.
Gordienko, On the influence of the energy parameters of spark discharges on the dispersion of the structure of the surface layer of a metallic material, Proceedings of the Kola Scientific Center, Chemistry and materials science, Issue 2, III All-Russian Scientific Conference with international participation dedicated to the 60th anniversary of IHTREMS FIC KSC RAS "Research and development in the field of chemistry and technology of functional materials". 2 (2018) 636-641

The Features of a High-Temperature Synthesis of ZrO2 in a Core-Shell ZrO2@C Structure Alexander M.
The obtained ZrO2@C samples of core-shell structure as well as the reference samples of pristine zirconia were calcined at different temperatures from 500 to 1400 °C.
Introduction Nowadays, core-shell systems of different compositions and structures are widely used in various areas of chemistry and biochemistry in order to isolate the reactive core from the environment [1-5].
By tuning the shell properties of such structures it is possible to perform the selective (targeted) interaction of the core material with components of the reaction mixture.
In principle, the possibility to create the core-shell structure with oxide core and carbon shell (Oxide@C) with stabilized size of the oxide core was reported in our recent papers [10-13].

Structures of the products were characterized by X-ray diffraction on a diffractometer (D8, Bruker) with Cu Kα radiation (l=0.154056 nm).
This can be attributed to the structure and morphology of the sample.
Zhitomirsky, Materials Chemistry and Physics 103 (2007), P47
Goodenough, Journal of Solid State Chemistry 144 (1999), P220

Among them, diatomite - a clay mineral with a macroporous structure has special interest.
The spatial structure of diatomite shell consists of separate parts of about 100 nm; the specific surface area is 46.2 m2/g.
[3] K.Korzhynbaeva, S.Tazhibayeva, K.Musabekov, M.Mataev, O.Zhanadilov, Preparation of magnetic compositions of diatomite, Applied mechanics and materials, vol. 467 (2014) 97-102 [4] O.Mokrousova, V.Moraru, The effect of Montmorillonite Modification by Cr(III)-Compounds on the Electrokinetic Properties of its Aqueous Dispersions, Scientific Journal of Technical University: Material science and applied chemistry, 21 (2010) 62-66
Meshram, Clay Intercalation Compound: Chromium removal study, International Journal of Research in Chemistry and Environment, vol. 2 Issue 2 (2012) 83-87

At the end of the last century, Ruifang Yan, a researcher of chemistry institute of CAS, initiated the manufacturing method of the trans- polyisoprene high elastic rubber through vulcanization [4].
Though microstructure test and the macroscopical test data of asphalt performance, the result and discussing are as follows: l It can be seen from the infrared spectrogram in Fig.3 that the C=C duplet bond in the EUG can occurs crosslinking reaction with the C=O duplet bond in asphalt to form the integral penetrable network structure (IPN).
This is because the C=C duplet bond base of can react with the C=O base of the asphalt to form the penetrable network structure; On the one hand, the viscosity’s increasing in the process of mixing and solidifying is good to prevent the subsidence of the rubber granule; On the other hand, the formation of the integral penetrating network urges the EUG to be well-distributed in asphalt.
[7] Yan Ruifang :Chemistry progresses, Vol. 7 (1)(1995),p. 65,In Chinese

TiO2 is a polymorphic substance that is present in three crystalline phases, anatase, rutile and brookite, with different properties and structures.
The crystal structure of common forms of TiO2 is tetragonal.
Uegusa, "Efficient nonsintering type dye-sensitized photocells based on electrophoretically deposited TiO2 layers," Chemistry Letters, vol. 31, no. 12, 2002, pp. 1250
Minoura, "Low temperature synthesis of porous nanocrystalline TiO2 thick film for dye sensitized solar cells by hydrothermal crystallization," Chemistry Letters, vol. 31, no. 9, 2002, pp. 874