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Hlushkov Ave, Kyiv, Ukraine 2Faculty of Chemistry, National Taras Shevchenko University of Kyiv, 62, Volodymyrska Str., Kyiv, Ukraine achukova@univ.kiev.ua, bsnedilko@univ.kiev.ua, cnedilko@univ.kiev.ua, dkotjara@univ.kiev.ua, evoitana@ukr.net Keywords: luminescence, vanadate, Eu3+ ions.
Dependencies of structure and luminescence properties on rate compositions and method of synthesis were studied.
The europium-free LaVO4 samples have monoclinic structure, and the Eu-containing La1-xEuxVO4 samples with ~ 0.1 < x ≤ 0.3 have tetragonal structure (Fig. 1).
With increasing of the europium content, transformation of crystal lattice structure from monoclinic to tetragonal occurs.
It is shown that lanthanum vanadate LaVO4 samples have monoclinic structure, whereas lanthanum-europium vanadate La1xEuxVO4 (~ 0.1 ≤ x ≤ 0.3) samples have tetragonal structure.

The use of one-dimensional metal oxides improves thermal stability of structure and properties of gas sensing material [22].
It is known that gas-sensing layers fabricated by thin-film technologies have rather compact structures [17].
The initial structure and size of metal oxide grains which have been modified should be also taken into account when evaluating the influence of surface modification on gas-sensing properties.
Weimar, in: Metal Oxides: Chemistry and Applications, edited by J.L.G.
Rao, in: Surface Chemistry and Catalysis, edited by A.

The electronic structure of colloidal QDs, which typically range from 3-12 nm in diameter, is dominated by quantum size effects.
(a) (c) (b) Fig. 1: Structure of hybrid junction devices using QDs of: (a) CdSe, (b) CdS, and (c) ZnS.
The figure shows the structure of (CdSe, CdS and ZnS) QDs EL devices.
Krueger et al., Hole-Transporting Host-Polymer Series Consisting of Triphenylamine Basic Structures for Phosphorescent Polymer Light-Emitting Diodes, Journal of Polymer Science: Part A: Polymer Chemistry, 48, (2010), 3417–3430
Yang, Solution-Processed Organic Light-Emitting Devices With Two Polymer Light-Emitting Units Connected in Series by A charge-Generation Layer, Journal of Materials Chemistry, (2012), 1-5

Eurasian Journal of Analytical Chemistry. 2020; 15(1): emEJAC-00362
[7] Grimm, B., 2001, Chlorophyll: Structure and Function.
[9] Scheer, H. 1991, Structure and occurrence of chlorophylls
Eurasian Journal of Analytical Chemistry, 14(4), emEJAC-00326
M.: 1995; Biosynthesis and structures of the bacteriochlorophylls.

The structure of macroPS was the same presented to that in Fig. 5 in the previous subsection.
Ionov, Formation and Structure of Mesoporous Silicon, Russian Microelectronics, 43, 8 (2014) 531-535
Bondarenko, Chemical corrosive deposition of copper on porous silicon, in Chemistry and Application of Nanostructures, World Scientific Publishing Co.
Influence of Si conductivity type on immersion deposition of Cu films on porous Si, in Physics, Chemistry and Application of Nanostructures, World Scientific Publishing Co.
Terekhov, Formation of SERS-Active Silver Structures on the Surface of Mesoporous Silicon, J.

The structure of the materials was investigated by X-ray diffraction, BET specific surface area analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis and element analysis.
Fourier transform infrared spectroscopy analysis showed N atoms are strongly bonded in the carbon structure in heterocycles or nitrile functions.
The method is based on the filling of the organized porous structure of a silica host by a carbon precursor in gaseous or liquid phase followed, if necessary, by a carbonization.
The synthesis procedure, the structural, textural and surface chemistry characteristics of the N-containing carbon replica are presented.
The SAXRD measurements confirm that the carbon replica displays a long-range ordered porous structure and retains the structure of the silica template.

It asks: Can seawater, with its corrosive ions and tempestuous chemistry, be tamed to build a sustainable future?
The Romans, unparalleled engineers, exploited seawater’s natural chemistry to create opus caementicium, a hydraulic concrete that hardened underwater.
Remarkably, these structures outperformed modern Portland cement in marine environments, challenging the notion that seawater is inherently destructive.
How does seawater affect the short- and long-term strength of concrete structures exposed to marine and non-marine environments?
This corrosion leads to progressive deterioration of the materials, reducing their mechanical strength and, consequently, the solidity of the structures.

Sucib, and Fahmi Taufiqulhadic Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Bandung-Sumedang, Km 21 Jatinangor, Indonesia aiman.rahayu@unpad.ac.id, bulimaalniatisuci@gmail.com, cfahmi.taufiqulhadi@gmail.com Keywords: Conductivity, Doping, Lithium Iron Phosphate, Silicon.
Fourier map analysis on LFP-S0 and LFP-S3 was conducted to observe electron densities in the ionic conduction pathways in the crystal structure.
The color went brighter as it was based on compatibility with electron densities in each standard structure.
In the structure shown, the position of the Si atom replaced the position of the P atom in the basic structure of LiFePO4.
Tarascon, Formation of a complete solid solution between the triphylite and fayalite olivine structures, Chem.

Microbial community structure of the enhanced granular sludge Samples of flocculant-producing bacteria and sludge were taken for DGGE analysis on Days 0, 7, 14, 21, 28, 35, 42, 49 and 56 (Fig. 2).
Changes in the community structure can be divided into three phases: the first stage, from 0 to 7 days; the second stage, from 7 to 21 days; and the third stage, which began after Day 28.
Finally, in the third stage, the microbial community structure was relatively stable with a few changes.
When the microbial community structure was stable, many types of microorganisms existed in small amounts.
Physico-chemistry of initial microbial adhesive interaction as- its mechanisms and methods for study.

A brief description of the sense structures and information parameters method, information volume and minimum perception time, is given.
The modules equivalent in the information terms can be easily put together to build a subject’s dynamic structure.
The sense structure methodology’s fundamentals structuring the learning material (module, topic, term comprising the topic), presenting the sense structure as a graph, evaluating the information contained in the said structure and the minimum perception time [3].
Newton’s third law and applicability limits of Newton’s laws” and its structure may be designed in different ways.
Sense Structure Methodology in the Learning Process. // Chemistry in School. – 2006. – No. 7.