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Упит dcterms_subject_txt:X-ray diffraction

101 items

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... properties of the fly ash and slag from PPNT A, PPNT B, PPKO A and PPKO B were determined by X-ray examinations. X-ray diffraction is a non-destructive ex- perimental method based on the diffraction of X-rays withcrystal lattice sized wavelengths. This method is primarily used for qual- ity analysis ...
    ... 2016 Available online October 20, 2016 Keywords: fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method cal properties, chemical and mineral compositions of the fly ash from thermal power plants (PP) „Nikola Tesla A” (NT A), „Nikola Tesla ...
    ... ĐE VIĆ, 2012). All samples were tested using the powder diffrac- tometer PHILIPS PW 1710. The diffraction patterns (diagrams) were obtained with CuKα radiation (λ=1.54178x10–10 m), created in the X-ray tube at 30mA and a voltage of 40kV. Sample record- ing was performed in the range of 2θ from 5 ...

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... thermal plant PPNT A production were determined by X-ray studies at the Laboratory of Crystallography Faculty of Mining - Geology in Belgrade. X-ray diffraction is a non- destructive experimental method based on the usage of the diffraction of X-rays with crystal lattice sized wavelengths. This method ...
    ... surface water and groundwater. Keywords: chemical composition; fly ash; mechanical properties; mineral properties; pozzolanic properties; X-ray diffraction Laboratorijska ispitivanja elektrofilterskog pepela Prethodno priopćenje Elektrofilterski pepeo (leteći pepeo) je jedan od najzastupljenijih ...
    ... the sample [16]. All samples were tested on the powder diffractometer PHILIPS PW 1710. The diffraction patterns (diagrams) were obtained with CuKα radiation (λ = 1,54178×10−10 m), created in the X-ray tube at 30 mA and a voltage of 40 kV. Record the sample is performed in the range of 2θ from ...

  • Solid state synthesis of extra phase-pure Li4Ti5O12 spinel

    Ivana Veljković, Dejan Poleti, Ljiljana Karanović, Miodrag Zdujić, Goran Branković (2011)
    Фазно чист спинел Li4Ti5O12 са величином честица мањом од 500 nm добијен је реакцијом у чврстом стању из стехиометријске смеше наноанатаса (ТiО2) и Li2CO3 која је претходно активирана механохемијским поступком. Реакција у чврстом стању у потпуности се завршава за само 4 часа на температури од 800 ºC. Уз помоћ XRPD, SEM и TG/DSC анализе испитане су структурне и микроструктурне карактеристике добијеног спинела, механизам реакције између анатаса и Li2CO3, као и термичка стабилност Li4Ti5O12. Реакција започиње разлагањем Li2CO3 на температурама ...
    дифракција рендгенских зрака, механизам реакције, термичка стабилност, Li4Ti5O12, спинел, фазно чист узорак

  • Phase and microstructural study of urinary stones

    Miljana Mirković, Anja Dosen, Suzana Erić, Predrag Vulić, Branko Matović, Aleksandra Rosić (2019)
    In this paper we present the phase and morphological characteristics of urinary stones from Serbian patients. The study included for the first time the determination of the phase composition and a statistical analysis of the presence of different types of urinary stones in both men and women in Serbia. The main goal of study was representation of collected data for the first time. For past three years, more than 600 samples were collected from Serbian patients. The phase composition ...
    бубрежно камење, фазни састав, статистика, рендгенска дифракција праха, скенирајућа електронска микроскопија

  • Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO–MO–As2O5–H2O (M2+ = Mg, Cu, Zn)

    Tamara Đorđević, Ljiljana Karanović (2018)
    During systematic research on the mineral-related synthetic arsenates, with particular focus on their structural and spectroscopic classification, three new Sr-containing arsenates Sr2Mg(AsO4)2· 2H2O (1), Sr2Zn4(AsO4)4·H2O (2) and Sr2Cu7(AsO4)6 (3) have been synthesized under low-temperature hydrothermal conditions in the system SrO MO As2O5 H2O (M 2þ = Mg, Zn, Cu). Their crystal structures were determined using room-temperature single-crystal X-ray diffraction data and refined to the following R-values: 1– R1 = 0.025; 2– R1 = 0.030; 3– R1 = 0.035. Compounds ...
    стронцијум, арсен, арсенати, кристална структура, дифракција рендгенских зрака на монокристалима, хидротермална синтеза, Раманска спектроскопија

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... 1371/journal.pone.0277365 November 17, 2022 2/38 PLOS ONE Surface functional groups and degree of carbonization of selected chars X-ray diffraction (XRD) [53,54], X-ray photoelectron spectroscopy (XPS) [54,55], Raman spectroscopy [54], Fourier transform infrared spectroscopy (FT-IR) [56] and titration ...
    ... HPO,x·12H»O. The recovery rate was determined by spiking the sample with standard solutions of phosphate that were added to 0.2 g of AC2. The average of three recovery values was 97.1%. The linearity of the method was assessed using ordinary least-square regression. X-ray diffraction. The X-ray ...
    ... components is inevitable at least for chars with high ash content and for chars containing volatile inorganic components like AC2. X-ray diffraction X-ray diffractograms are shown in Fig 3 and with higher resolution in S2 Fig in S1 File. The scattering angles are given as values of 20 and for ...

  • Sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja

    Predrag Z. Dabić (2022)
    Predmet i ciljevi naučnog istraživanja ove doktorske disertacije su sinteza i strukturna karakterizacija novih cezijumskih i kalijumskih silikata sa elementima retkih zemalja. Istraživanja su izvedena u okviru sistema SiO2–REE2O3–XF, gde REE predstavlja trovalentni katjon elementa retkih zemalja (Sc, Y, Sm, Eu, Gd, Ho, Er, Tm, Yb, Lu), dok X predstavlja jednovalentni katjon alkalnih metala (K, Cs). Rad na disertaciji bio je fokusiran na sintezu monokristala, određivanje kristalnih struktura, kao i na kristalografsko i kristalohemijsko ispitivanje sintetisanih monokristala. Monokristali su sintetisani ...
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu, elementi retkih zemalja

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... K3EuSi2O7 was analyzed by the single-crystal X-ray diffraction method. Diffraction experiments were conducted on a Gemini S (Oxford Diffraction) four-circle diffractometer equipped with a Mo-anode sealed tube and a Sapphire3 CCD detector. Diffraction data were processed with the CrysAlisPro.17 The ...
    ... Single crystals of K3EuSi2O7 were prepared by high-temperature flux crystal growth and were characterized by single-crystal X-ray diffraction, powder X-ray diffraction and SEM analysis. The compound crystallizes like disilicates containing the larger REEs, i.e. Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, ...
    ... The synthesized pro- ducts were tested using X-ray powder diffraction (XRPD). A small amount of material was finely ground and tested on a Philips PW1710 X-ray powder diffractometer at room temperature using Bragg-Brentano geometry and Cu Kα radiation. The diffractometer was operated at 40 kV and ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... sive X-ray spectrometry (EDS, X-Max, Oxford Instruments PLC, Abingdon, UK), using internal standards with detection limit ~0.1 wt.%. Simultaneously, the homogeneity and possible zoning were analysed by backscattered electron (BSE) micrographs (Figure 1c,d). 2.2. X-ray Powder Diffraction (XNRPD) ...
    ... calculated by PDXL2-integrated X-ray powder diffraction software (Version 2.8.30; Rigaku Corporation). The characteristic arsenopyrite PXRD pattern from Drenjak, compared with the theoretical XRPD pattern from [9], is presented in Figure 2. Table 1. X-Ray Powder Diffraction (XRPD) results for analysed ...
    ... Digital Micrograph software (v3.1, Gatan Inc., Pleasanton, CA, USA). 3. Results and Discussion 3.1. X-ray Pouwder Diffraction (XRPD) In total, 14 samples were analysed by X-Ray Powder Diffraction (XRPD), among them four specimens from the Drenjak locality (Figrure 2). The cell parameters for in ...

  • Improved structural model of Pb-doped γ-Bi2O3: (Bi23.68Pb0.32)(Bi1.28Pb0.72)O38.48

    Dapčević Aleksandra, Poleti Dejan, Karanović Ljiljana (2012)

  • Crystal chemistry of nephelines from ijolites and nepheline-rich pegmatites: influence of composition and genesis on the crystal structure investigated by X-ray diffraction

    Vulić Predrag, Balić-Žunić Tonči, Belmonte Louise Josefine, Kahlenberg Volker (2011)

  • Single-crystal X-ray diffraction study of Cs2Er[Si6O14]F and Cs2Er[Si4O10]F

    Dabić Predrag, Kahlenberg Volker, Schmidmair Daniela, Vulić Predrag, Kremenović Aleksandar (2016)

  • Геохемијске карактеристике флотацијског јаловишта рудника Грот (југоисточна Србија)

    Božidar Đokić (2012-07-16)
    У дисертацији су анализиране геохемијске карактеристике флотацијскогјаловишта које се налази на највишој надморској висини у Србији. Јаловиште јенастало преграђивањем узводно од Селишког потока. Географске, геолошке игеоморфолошке карактеристике области у којима је смештено највећим делом суутицали на његову морфологију и морфометрију. Јаловиште чини велики, јужни ијугоисточни плато и велика брана. Делови јаловишта су засебно испитивани, азатим и њихова међусобна интеракција и утицаји на окружење.Прикупљени узорци су испитивани рендгенском дифракциономанализом, скенирајућом електронском микроскопијом, рендгенскомфлуоресцентном спектрометријом, гранулометријском и хемијском анализом.Рендгенском дифракционом анализом ...
    флотација, јаловиште, скенирајућа електронско-микроскопскаанализа, рендгенска флуоресцентна спектрометрија, Pb-Zn руда,тешки метали, контаминација
    ... Samples were analyzed by the X-ray diffraction analyses, Scanning electron microscopy, X-ray fluorescence spectrometry, granulometric and chemical analyses. Minerals of the silicate, sulphide, oxide and carbonate classes were determined by the X-ray diffraction analyses. All minerals were primarily ...
    ... Geochemical characteristics of the tailing were determined by the presence of heavy metals. The most significant of them were determined by the X-ray fluorescence spectrometry. The most abundant is Fe. On the large plateau the next most abundant is Pb, and on the other parts of the tailing Zn ...
    ... tailing is not possible because the mine and flotation are still active. Key words: flotation, tailing, Scanning electron microscopy, X-ray fluorescence spectrometry, Pb-Zn ore, heavy metals, contamination SCIENTIFIC FIELDS: EARTH SCIENCES SPECIAL TOPICS: GEOCHEMISTRY UDC: 550 ...

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Sinteza i karakterizacija nanoprahova u CeO2-Bi2O3 sistemu

    Marija D. Prekajski (2014-04-04)
    Nanoprahovi kristalnih faza iz serije čvrstih rastvora u pseudo-binarnom sistemuCeO2-Bi2O3 sintetisani su primenom jednostavne i ekonomične samopropagirajućemetode na sobnoj temperaturi korišćenjem nitrata metala i natrijum-hidroksida kaopolaznih supstanci. Osim krajnjih članova niza, CeO2 i niskotemperaturne polimorfnemodifikacije α-Bi2O3, sintetisani su i čvrsti rastvori nominalnog sastava Ce1-xBixO2-δ,gde je x = 0,1; 0,2; 0,3; 0,4; 0,5; 0,6; 0,7; 0,8; 0,9. Rezultati proučavanja metodomrendgenske difraktometrije na polikristalnom materijalu i ramanske spektroskopskeanalize pokazali su da su sintetisani prahovi sa nižim sadržajem bizmuta (x = 0,1 ...
    nanostrukturni materijali, čvrsti rastvori, CeO2, Bi2O3, rendgenskadifraktometrija praha, Ritveldova metoda, mikrostrukrurna analiza

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)
    ... natural clay samples was performed using the X-ray diffraction method. This method was also used in order to track structural changes in montmorillonites during the modification treatment and adsorption process.  Based on the X-ray diffraction diagrams, it was concluded that, after saturation ...

  • Investigation of Co0.9Ho0.1MoO4 Nanopowders Obtained by Glycine Nitrate Procedure

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... size CoooHooiMoO+ powder particles were obtained by applying glycine nitrate procedure (GNP). Powder properties have been studied by DTA, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, Spectroscopy, Field emission scanning electron microscopy (FESEM), and nitrogen adsorption ...
    ... powder indicated a potentially i promising solution in photocatalytic processes toward green chemistry and sustainable development. Keywords: X-ray diffraction, Electron microscopy, Nanostructured materials -– 23- ...

  • Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate procedure

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... crystalline structure. The resulting: CapEro,, MnOxy is calcined for 15 minutes in the temperature range from 800% to 1000%. Diffraction thermal analysis (DTA), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and inductively coupled ...