Search results for "Partial substitution"

showing 3 items of 3 documents

K2MIII2(MVIO4)(PO4)2 (MIII = Fe, Sc; MVI = Mo, W), Novel Members of the Lagbeinite-Related Family: Synthesis, Structure, and Magnetic Properties

2012

The possibility of PO(4)(3-) for MoO(4)(2-) partial substitution in the langbeinite framework has been studied by exploration of the K-Fe(Sc)-Mo(W)-P-O systems using the high-temperature solution method. It was shown that 1/3PO(4)(3-) for MoO(4)(2-) substitution leads to formation of three novel compounds K(2)Fe(MoO(4))(PO(4))(2), K(2)Sc(MoO(4))(PO(4))(2), and K(2)Sc(WO(4))(PO(4))(2) with slightly increased lattice parameters and significant distortion of the anion tetrahedra without structure changes. In contrast, the antiferromagnetic structure is modified by substitution in the low-temperature region. The structural peculiarities are discussed in light of bond-valence sums calculations.

Inorganic ChemistryCrystallographyLangbeiniteChemistryLattice (order)AntiferromagnetismPhysical and Theoretical ChemistryPartial substitutionIonInorganic Chemistry
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Study of the Partial Substitution of Pb by Sn in Cs-Pb-Sn-Br Nanocrystals Owing to Obtaining Stable Nanoparticles with Excellent Optical Properties.

2018

Halide perovskites are revolutionizing the photovoltaic and optoelectronic fields with outstanding performances obtained in a remarkably short time. However, two major challenges remain: the long-term stability and the Pb content, due to its toxicity. Despite the great effort carried out to substitute the Pb by a less hazardous element, lead-free perovskite still remains more unstable than lead-containing perovskites and presents lower performance as well. In this work, we demonstrate the colloidal preparation of Cs–Pb–Sn–Br nanoparticles (NPs) where Sn is incorporated up to 18.8%. Significantly, we have demonstrated that the partial substitution of Pb by Sn does not produce a deleterious e…

Materials sciencePhotoluminescenceInorganic chemistryperovskitesHalideQuantum yieldNanoparticle02 engineering and technologyPartial substitution010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences7. Clean energyArticle0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsColloidGeneral EnergyNanocrystaloptoelectronic propertiesPhysical and Theoretical Chemistry0210 nano-technologyPerovskite (structure)The journal of physical chemistry. C, Nanomaterials and interfaces
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Crystal Structure of New Heusler Compounds

2009

Heusler compounds are promising materials in many fields of contemporary research. The spectrum of their possible applications ranges from magnetic and magneto-mechanical materials over semiconductors and thermoelectrics to superconductors. An important feature of the Heusler compounds is the possibility of controlling the valence electron concentration by partial substitution of elements. On the other hand, the properties also depend on the degree of ordering of the the crystal structure. In general, Heusler compounds crystallize in the Cu2MnAl-type structure but in many cases certain types of disorder are observed. In this paper a detailed description of the different types of disordered …

SuperconductivityCondensed matter physicsChemistrybusiness.industryCrystal structurePartial substitutionThermoelectric materialsInorganic ChemistryCrystallographySemiconductorX-ray crystallographyTernary operationValence electronbusinessZeitschrift für anorganische und allgemeine Chemie
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