2. Experimental section2.1.Synthesis of Ln 2 Ru 2 O 7 pyrochlore oxides. Pyrochlore ruthenate Ln 2 Ru 2 O 7 samples were synthesized using a conventional sol-gel method. Typically, 0.5 mmol of Ln (NO 3) 3 ꞏ6H 2 O and 0.42 g (or 2 mmol) of citric acid were dissolved in 10 mL of DI water under vigorous stirring to form a clear solution. Then, …
Засгийн газрын 2020 оны 206 дугаар. тогтоолын хавсралт. БОДЛОГЫН БАРИМТ БИЧГИЙН ХЭРЭГЖИЛТ, ЗАХИРГААНЫ. БАЙГУУЛЛАГЫН ҮЙЛ АЖИЛЛАГААНД ХЯНАЛТ-ШИНЖИЛГЭЭ, ҮНЭЛГЭЭ ХИЙХ НИЙТЛЭГ ЖУРАМ. Нэг. …
Халууралт: шат. халуурах хөгжлийн үндсэн гурван үе шатыг дамжин явдаг. Эхний - температур нэмэгдэх, хүн хоёр дахь - энэ нь зарим нэг удаа зохион байгуулж байгаа бөгөөд гурав дахь - аажмаар эх ...
Similar observations were detected using the ball milling technique for other materials [23,24,25].Abdolhoseinzadeh and Sheibani [] prepared a ball-milled Cu 2 O–ZnO nano-photocatalyst with good performance under visible light irradiation.They found that ball milling of Cu 2 O and the presence of ZnO improves electron transfer and suppresses …
Recently, a new class of quantum magnets, the so-called breathing pyrochlore spin systems, have attracted much attention due to their potential to host …
Журам батлах тухай/Үр хөндөлтийг зохицуулах журам/ А/387: : Үзэх: Журам батлах тухай/Эрүүл мэндийн байгууллагуудад лавлагаа төвөөс цахимаар өгөх / А/385: : Үзэх
Ca 2 Nb 2 O 6 F ( download cif) is the nominal pyrochlore mineral. The general formula for Pyrochlore is A 2 B 2 O 7, or more accurately: A 2 B 2 O 6 O'. In the case of nominal pyrochlore, F occupies the F' site. Pyrochlore is highly symmetric, and is face-centered. The easiest way to begin to visualize the structure is by looking at the unit ...
A systematic and rational nomenclature of minerals of the pyrochlore group are developed based on the results obtained by processing 671 chemical analyses of pyrochlore-group minerals from carbonatite complexes, alkali rocks, and their pegmatites, granite pegmatites, and alkali and albitized granites. The proportions of Nb, Ta, and Ti …
Pyrochlore has the generalized formula A 2–m B 2 X 6–w Y 1–n, where m, w and n refer to vacancies (Atencio et al., 2010). At St Honoré, the main A-site elements are Ca, Na, Fe, U, Sr, Th and the REE, and the main B-site elements are Nb, Ti, Si, Ta and Zr. Fluorine and OH are the main occupants of the Y-site.
In this article we provide some perspectives on a range of pyrochlore and defect fluorite type compounds with nominal A2B2O7, A2BO5, ABC2O7, and other stoichiometries. Typically, the phase transformations and stability fields in these systems are mapped as a function of the ionic radii of the A and B-site cations, e.g., the A/B …
The surprisingly complex array of prototypical pyrochlore behaviors we discovered in chromium spinels may inspire studies of transition paths between different semi-classical spin liquids by ...
The surprisingly complex array of prototypical pyrochlore behaviors we discovered in chromium spinels may inspire studies of transition paths between different …
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Nevertheless, the synthesis of high-entropy pyrochlore oxides containing up to 7 different cations has not been reported so far. Herein, we successfully synthesized a series of multicomponent, equiatomic single-phase, pyrochlore oxides via solid-state reaction. The phase composition, Raman spectroscopy, micro-scale EDS elemental …
pyrochlore: [noun] a brown or dark reddish mineral NaCaCb2O6F that is isomorphous with microlite and is an oxide and fluoride of sodium, calcium, and columbium.
All the synthesized powders exhibited a single pyrochlore phase with particle size depending on the Pr content. Powders with Pr content smaller than 25 mol% were nanometric. X-ray photoelectron spectroscopy analysis revealed a mixed oxidation state of both Pr and Ru, and a variation of the oxidation state of the elements in response …
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Crystallography, Chemistry, and the Nomenclature Scheme. The general formula of the pyrochlore-supergroup minerals is A 2 B 2 X 6 Y.In this formula, A typically is a large [8]-coordinated cation with a radius of ∼1.0 Å or a vacancy ( ) but can also be H 2 O. For structural reasons, A can be subdivided into constituents without lone-pair …
The general formula of the pyrochlore-supergroup minerals is A 2 B 2 X 6 Y. The mineral names are composed of two prefixes and one root name (identical to the …
The development of highly efficient photocatalysts for conversion of carbon dioxide (CO 2) with water (H 2 O) into chemical fuels is of great importance for energy sustainability and carbon resource utilization. Herein, we demonstrated a facile hydrothermal method for in situ construction of subnanometric Bi metallic clusters in …
(2) If the radius ratio is in the range of 1.46–1.78, an ordered pyrochlore phase will be formed which belongs to the space group of Fd-3m. 1, 2, 5, 6 As shown in Scheme 1 (b), the structure of the ordered pyrochlore phase can be described as an ordered defective fluorite, in which 1/8 of the oxygen anions are unoccupied. 1, 2, 5, 6 …
Цаг үеийн мэдээ Коронавируст халдвар (covid-19)-ын үед эмнэлгийн тусламжийн бэлэн байдлыг хангахад чиглэсэн заавар зөвлөмж Коронавируст халдвартай холбоотой журам, заавар Хүлээгдлийн мэдээ
PDCA мөчлөг нь "Хийх" үе шатанд өөрчлөлтийг бага хэмжээгээр шалгах боломжийг олгодог. Энэхүү хяналттай хэрэгжилт нь томоохон хэмжээний бүтэлгүйтлийн эрсдлийг бууруулдаг. Асуудлыг эрт ...
Ba3Yb2Zn5O11 is exceptional among breathing pyrochlore compounds for being in the nearly-decoupled limit where inter-tetrahedron interactions are weak, hosting …
The initial proposal 1 of quantum spin ice 2 behaviour in the pyrochlore Yb 2 Ti 2 O 7 has ignited a plethora of experimental and theoretical studies of Yb 3+ …
Pyrochlore (Ca, Na)2Nb2O6(OH, F) c 2001-2005 Mineral Data Publishing, version 1. Crystal Data: Cubic; typically metamict. Point Group: 4/m 3 2/m. Typically octahedra, …
The exceptional OER activity and stability of lead ruthenate pyrochlore catalysts were evaluated in a solid-state alkaline water electrolyzer. The overpotentials obtained were 0.1–0.2 V lower than for IrO 2 and the performance was stable for …
