Results 11 to 20 of about 549 (136)

Magnetic pyrochlore oxides [PDF]

Reviews of Modern Physics, 2010
Review article. 55 pages, 60 figures.
Gardner, Jason S., Gingras, Michel J. P., Greedan, John E.   +2 more
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Frustrated ferroelectricity in niobate pyrochlores [PDF]

Journal of Physics: Condensed Matter, 2008
The crystal structures of the A2B2O7-x Niobium-based pyrochlores Y2(Nb0.86Y0.14)2O6.91, CaYNb2O7, and Y2NbTiO7 are reported, determined by powder neutron diffraction. These compounds represent the first observation of B-site displacements in the pyrochlore structure: the B-site ions are found to be displaced from the ideal pyrochlore positions ...
T M, McQueen, D V, West, B, Muegge, Q, Huang, K, Noble, H W, Zandbergen, R J, Cava   +6 more
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Magnetic frustration in lead pyrochlores [PDF]

Physical Review B, 2015
The rich phase diagrams of magnetically frustrated pyrochlores have maintained a high level of interest over the past 20 years. To experimentally explore these phase diagrams requires a means of tuning the relevant interactions. One approach to achieve this is chemical pressure, that is, varying the size of the non-magnetic cation. Here, we report on a
Hallas, A. M., Arevalo-Lopez, A. M., Sharma, A. Z., Munsie, T., Attfield, J. P., Wiebe, C. R., Luke, G. M.   +6 more
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Synthesis and physical properties of pyrochlore cobalt oxides Bi1.56-xCaxSb1.48Co0.96O7-δ [PDF]

Cerâmica, 2023
A new solid solution Bi1.56-xCaxSb1.48Co0.96O7-δ (0≤x≤0.3) with a pyrochlore-like structure (A2B2O7) was synthesized in air by chemical solid-state reaction. The solution crystallized in the cubic system with the Fd-3m space group.
M. Sellami, K. Zouaoui, B. Talbi, C. Mekki-Douadji, M. Berahal, F. Merabet, K. Ezziane   +6 more
doaj   +1 more source

Microstructure and electrical properties of microwave sintered Nb-doped NBT ceramics [PDF]

Processing and Application of Ceramics, 2021
Nb5+-doped sodium bismuth titanate (NBT) ceramics ((Na0.5Bi0.5)1-x/2Ti1-xNbxO3 where x = 0, 0.005, 0.01 and 0.015) were obtained by microwave assisted solid state reaction route and microwave sintered at 1000 °C. Microwave processing technique was chosen
Sahu Rashmirekha, Kumar Pawan
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Phase formation on the surface of lead ferroniobate depending on the conditions of mechanochemical synthesis and sintering [PDF]

Science of Sintering, 2016
The perovskite structure is formed at lower temperatures with an increase in the time of preliminary activation. It is demonstrated that thermal treatment of mechanically activated for 25 minutes mixture composed of niobium oxide, lithium ...
Gusev Aleksey Alekseevich, Raevski Igor Pavlovich, Avvakumov Evgeniy Grigorievich, Isupov Vitaliy Petrovich   +3 more
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Heavily doped high-entropy A2B2O7 pyrochlore [PDF]

Processing and Application of Ceramics, 2023
A novel class of high-entropy pyrochlore compounds with multiple elements at the A and B site positions (A2B2O7) was successfully obtained. Powders with (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 nominal composition were fabricated from ...
Matović Branko, Maletaškić Jelena, Maksimović Vesna, Zagorac Jelena, Luković Aleksa, Zeng Yu-Ping, Cvijović-Alagić Ivana   +6 more
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Structural Evolution and Magnetic Properties of Gd₂Hf₂O₇ Nanocrystals: Computational and Experimental Investigations

Molecules, 2020
Structural evolution in functional materials is a physicochemical phenomenon, which is important from a fundamental study point of view and for its applications in magnetism, catalysis, and nuclear waste immobilization.
Madhab Pokhrel, Nicholas Dimakis, Chamath Dannangoda, Santosh K. Gupta, Karen S. Martirosyan, Yuanbing Mao   +5 more
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XPS and NEXAFS Studies of Zn-Doped Bismuth Iron Tantalate Pyrochlore

Inorganics, 2023
The effect of Zn-doping on the phase composition and optical properties of the Bi2ZnxFe1-xTa2O9.5-Δ (x = 0.3, 0.5, 0.7) was studied. XRD data showed that the samples crystallize in the structural type of pyrochlore (sp. gr.Fd-3m). For all the samples, an
Sergey V. Nekipelov, Victor N. Sivkov, Danil V. Sivkov, Alexey M. Lebedev, Ratibor G. Chumakov, Aleksandra V. Koroleva, Boris A. Makeev, Nadezhda A. Zhuk   +7 more
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Universal geometric frustration in pyrochlores [PDF]

Nature Communications, 2018
AbstractMaterials with the pyrochlore/fluorite structure have diverse technological applications, from magnetism to nuclear waste disposal. Here we report the observation of structural instability present in the pyrochlores A2Zr2O6Oʹ (A = Pr, La) and Yb2Ti2O6Oʹ, that exists despite ideal stoichiometry, ideal cation-ordering, the absence of lone pair ...
Trump, BA, Koohpayeh, SM, Livi, KJT, Wen, J-J, Arpino, KE, Ramasse, QM, Brydson, R, Feygenson, M, Takeda, H, Takigawa, M, Kimura, K, Nakatsuji, S, Broholm, CL, McQueen, TM   +13 more
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