scholarly journals Mineral and ore characterization of the rare earth element from Khotgor deposit

2018 ◽  
pp. 13-21
Author(s):  
Burmaa G ◽  
Alen S ◽  
Аzzaya T
Keyword(s):  
Rare Earth ◽  
Academic Research ◽  
Diffraction Method ◽  
Total Content ◽  
X Ray Diffraction ◽  
Research Knowledge ◽  
Concentrate Treatment ◽  
Ore Characterization ◽  
Cerium Group

Although many new deposits of rare earth elements (REEs) are being discovered, the technical and technological knowledge on the separation of REEs from its ore by concentrating procedure and concentrate treatment are limited. In Mongolia, doing research on the chemical technological characteristics of the REEs mineral and ore would have been a great importance for the academic research knowledge and creation of new documents with respect to REEs. Moreover, it can be efficiently resulted to socio-economic issue in our country. The surface rocks and ore from Khotgor deposit located in Umnugobi province were studied by electron microscopy, SEM/EDX and X-ray diffraction method. As a result, the rocks are composed to sienite protracted by carbonatite, nepheline-sienite rocks with breccially-formed, apatite (flourapatite) with 1-3%, barite, celestine, pyrite and magnetite, respectively. In the rock, REEs’s total content was about 0.02-1.6%, and its 86.2-95.7% for the cerium group elements. A nepheline sienite and sienite that includes apatite, barite, celestine, pyrite and magnetite were composed to the ore. Total content of REEs in this ore was 2.18% with light REEs about 95%. This study summarized the chemical composition of rocks, ores and minerals. Furthermore, the contents of REEs and characterization of the carrier minerals and other accompanied minerals were presented. Хотгор ордын газрын ховор элементийн хүдэр ба эрдсийн шинж чанар Хураангуй: Газрын ховор элемент (ГХЭ)-ийн олон шинэ ордууд нээгдэж байгаа ч тэдгээрийн хүдрээс ГХЭ-ийг баяжуулан ялгаж авах, баяжмалыг боловсруулах техник технологийн мэдлэг хязгаарлагдмал байгаа өнөө үед Монгол улс дахь ГХЭ-ийн хүдэр, эрдсийн химийн технологийн шинж чанарыг нарийвчлан судалж, академик судалгааны мэдлэг хуримтлуулах, баримт материал бий болгох нь нийгэм, эдийн засгийн чухал ач холбогдолтой. Өмнөговь аймгийн нутагт орших Хотгор ордын гадаргын чулуулаг ба хүдрийг электрон микроскоп, SEM/EDХ ба рентген дифракцийн аргаар судлав. Чулуулаг нь гадаргуугийн өгөршилд өртсөн сиенит ба брекчлэг бүтэц үүсгэсэн нефелин сиенит чулуулгаас тогтсон, сиенит нь карбонатитээр бага зэрэг түрэгдсэн 1-3% хүртэл апатит (фторапатит) болон барит, целестин, пирит, магнетит зэрэг эрдэс агуулж байна. Чулуулагт ГХЭ-ийн нийлбэр агууламж 0.02-1.6%, түүний 86.2-95.7% нь церийн бүлгийн элементүүдэд ноогдоно. Хүдрийн чулуулаг нь апатит (фторапатит) болон барит, целестин, пирит, магнетит зэрэг эрдэс агуулсан сиенит ба нефелин сиенит, ГХЭ-ийн нийлбэр агууламж 2.18%, мөн түүний 95%-ийг хөнгөн ГХЭ-үүд эзэлж байна. Энэхүү судалгаанд чулуулаг, хүдэр, эрдсүүдийн химийн бүрдэл, ГХЭ-ийн агууламж, тээгч ба дагалдах зарим эрдсүүдийн шинж чанарыг судалсан үр дүнгээс оруулав.Түлхүүр үг: нефелин,сиенит, апатит, фторапатит

scholarly journals Structural and morphological characterization of rare earth modified lead titanate

Cerâmica ◽  
2007 ◽  
Vol 53 (328) ◽  
pp. 422-447
Author(s):  
F. C. D. Lemos ◽  
D. M. A. Melo ◽  
P. S. de Lima ◽  
C. A. Paskocimas ◽  
E. Longo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Lead Titanate ◽  
Pechini Method ◽  
Morphological Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Crystallite Sizes ◽  
Modifier Cation

Rare earth modified lead titanate powders Pb1-xRExTiO3 (REPT), x = 0.01, 0.05, 0.07 and RE = Yb, Y, were prepared by the Pechini method. The materials were calcined under flowing oxygen at different temperatures from 300 to 700 ºC. Nanostructured REPT were investigated using X-ray diffraction, scanning electron microscopy and surface area analysis (BET). The results suggest that the modifier cation incorporated into the system has notable influence in the microstructure and a notable decrease in the crystallite sizes.

Synthesis and Characterization of Zinc Doped Hydroxyapatite for Bone Substitute Applications

2014 ◽  
Vol 660 ◽  
pp. 942-946
Author(s):  
Mohamad Firdaus Abdul Wahid ◽  
C.M. Mardziah ◽  
Koay Mei Hyie ◽  
N.R. Nik Roselina
Keyword(s):  
Crystal Size ◽  
Diffraction Method ◽  
Lattice Parameters ◽  
Phase Changes ◽  
Precipitation Method ◽  
Zinc Ions ◽  
Crystal Shape ◽  
X Ray Diffraction ◽  
X Ray

Hydroxyapatite was prepared by using precipitation method. The substitution of zinc ions in hydroxyapatite structure was studied by several characterization techniques. Several concentration of zinc ions were substituted into hydroxyapatite. Characterization technique such as X-ray diffraction method was used to study the phase changes and the lattice parameters with the addition of zinc. Field emission scanning electron microscopy was used to examine the influence of zinc on the crystal size and the morphology of the as-synthesized powders. Based on X-ray diffraction result, the addition of zinc affects the lattice parameters and phase. The result showed that zinc ions were substituted in the structure. As zinc substitution increased, the lattice parameters a and c decreased. The crystal shape of hydroxyapatite without zinc ions was regular shapes while hydroxyapatite with zinc ions was irregular and also tends to agglomerates with single particle was calculated about 28 - 34 nm .

Synthesis and Characterization of Rare Earth (Tb3+ and Yb3+) Doped CdS/ZnS Core/Shell Nanocrystals for Enhanced Photovoltaic Efficiency

2011 ◽  
Vol 1322 ◽  
Author(s):  
Sandip Das ◽  
Krishna C. Mandal
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
X Ray ◽  
Broadband Absorption ◽  
Photovoltaic Efficiency ◽  
Transmission Electron

ABSTRACTCdS host nanocrystals with 4.2-5.5 nm in diameter have been synthesized from air stable precursors via a synthetic chemical route and doped with rare earth (RE) terbium (Tb3+) and ytterbium (Yb3+) ions. RE3+-doped CdS cores were shelled by ZnS layers of different thicknesses. The resulting core/shell nanocrystals show a complete broadband absorption below 400-460 nm to the deep UV region depending on the size of the cores. RE3+-doped CdS nanocrystals showed a red shift in the emission as observed under irradiation of 302 nm UV light and was confirmed by room temperature photoluminescence (PL) measurements. The nanocrystals were further characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive x-ray (EDX) analysis. The results show that these RE3+-doped nanocrystals can be used as solar spectral matching downconversion material to enhance photovoltaic efficiency of existing solar cells.

scholarly journals Growth and Characterization of Pure and Doped L-Alanine Tartrate Single Crystals

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
K. Rajesh ◽  
B. Milton Boaz ◽  
P. Praveen Kumar
Keyword(s):  
Single Crystals ◽  
Vickers Microhardness ◽  
Diffraction Method ◽  
Dielectric Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Single crystals of pure and Lanthanum doped L-Alanine Tartrate were grown by slow evaporation method. The cell parameters were determined using single crystal X-ray diffraction method. To improve the physical properties of the LAT crystal, Lanthanum dopant was added by 2 mol%. ICP studies confirm the presence of Lanthanum in the grown LAT crystal. Transparency range of the crystal was determined using UV-VIS-NIR spectrophotometer. The functional groups of pure and doped LAT crystals were analyzed by FT-IR spectroscopy. Using Vickers microhardness tester, mechanical strength of the material was found. Dielectric studies of pure and doped LAT single crystals were carried out. The doped LAT crystal is found to have efficiency higher than that of pure LAT crystal.

scholarly journals Synthesis and Characterization of Sr2CeO4 Phosphor Doped with Erbium

2010 ◽  
Vol 13 (1-2) ◽  
pp. 17
Author(s):  
K.V.R. Murthy ◽  
K. Suresh ◽  
B. Nageswara Rao ◽  
B. Walter Ratna Kumar ◽  
Ch. Atchyutha Rao ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solid State ◽  
Sem Analysis ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Rare Earth Ion ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Pl Emission

<p>The present paper reports the Photoluminescence (PL) of the Sr<sub>2</sub>CeO<sub>4</sub> phosphor, singly doped with Erbium rare-earth ion with different concentrations (0.01, 0.1, 0.2, 0.5 and 1%).The phosphor samples were synthesized using the standard solid state reaction technique. The effect of Er dopant on the structural, morphological, and Photoluminescent properties of the samples are studied with X-ray diffraction (XRD), PL and SEM analysis. The PL emission of undoped Sr<sub>2</sub>CeO<sub>4</sub> phosphor was observed at 470 nm with high intensity followed by the primary Er emissions with good intensity at 525, 530, 549, 557 and 565 nm.</p>

scholarly journals Characterization Of Microstructure And Selected Properties of SnSbCu Alloy After FSP

2021 ◽  
Author(s):  
Joanna Hrabia-Wiśnios ◽  
Beata Leszczyńska-Madej ◽  
Marcin Madej ◽  
Aleksandra Węglowska
Keyword(s):  
Flexural Strength ◽  
Diffraction Method ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
Linear Speed ◽  
X Ray ◽  
Friction Stir ◽  
Before And After ◽  
Bearing Alloy

Abstract The paper presents the results of research on the microstructure and selected mechanical properties of the SnSbCu bearing alloy after friction stir processing (FSP). The Whorl tool was used for modification; the process was carried out using two rotational speeds of the tool: 280 and 450 RPM and a constant linear speed of 355 mm/min. Microstructure studies were performed employing the techniques of light microscopy and scanning electron microscopy along with analysis of the chemical composition of micro-areas. Additionally, the phase composition was investigated by means of the X-ray diffraction method and statistical analysis of the precipitates present in the investigated alloy. In addition, hardness, flexural strength and uniaxial compression tests were performed before and after FSP modification. It was proved that using FSP to modify the SnSbCu alloy promotes refinement and homogenization of the microstructure, as well as improvement of the flexural strength, whereas no changes in the hardness level were found.

scholarly journals Effect of PEG-2000 on saturation magnetization Fe3O4 particles synthesized with coprecipitation method

2017 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Dwi Puryanti ◽  
Dori Andani ◽  
Merry Thressia
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Base Material ◽  
Diffraction Method ◽  
Coprecipitation Method ◽  
X Ray Diffraction ◽  
Magnetization Saturation ◽  
Sand Base ◽  
The Village

<p class="Abstract">Synthesis of Fe<sub>3</sub>O<sub>4</sub> particles was performed using coprecipitation method. Iron sand base material obtained by processing the iron rocks by means of destruction and extraction. Iron rocks were taken from the village Surian, South Solok of West Sumatera. Iron sand that has been extracted reacted with HCL and NH<sub>4</sub>OH. Furthermore, the PEG-2000 were added to see its effect on the resulting magnetization saturation. Variations in the composition ratio of iron sand and PEG-2000 are 1:0, 1:1, 1:2 and 1:4. The crystal structure of the sample was confirm using x-ray diffraction method. Characterization of magnetic properties carried out using vibrating Sample Magnetometer (VSM). The results of magnetic properties show that the saturation magnetization decreases with increasing of PEG-2000 content in the range of 99.50emu/g - 0,84 emu/g.</p>

scholarly journals Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite

Open Physics ◽  
2013 ◽  
Vol 11 (2) ◽  
Author(s):  
Aleksandra Mielewczyk-Gryn ◽  
Tomasz Lendze ◽  
Katarzyna Gdula-Kasica ◽  
Piotr Jasinski ◽  
Andrzej Krupa ◽  
...  
Keyword(s):  
Sintering Temperature ◽  
Perovskite Phase ◽  
Pyrochlore Phase ◽  
Diffraction Method ◽  
Total Conductivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Interaction ◽  
Composite Samples

AbstractA composite of CaTi0.9Fe0.1O3 and electrolyte material, i.e. magnesium doped La0.98Mg0.02NbO4 was prepared and studied. The phase content and the sample microstructure was examined by an X-ray diffraction method and scanning electron microscopy. EDS measurements were done both for composite samples and the diffusion couple. The electrical properties were studied by four terminal DC method. The high-temperature interaction between the two components of the composite has been observed. It has been suggested that lanthanum diffused into the perovskite phase and substituted for calcium whereas calcium and niobium formed the Ca2Nb2O7 pyrochlore phase. At 1500°C very large crystallites of the pyrochlore were observed. Regardless of strong interaction between the composite components, its total conductivity was weakly dependent on the sintering temperature.

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