Results 11 to 20 of about 1,560 (187)

A Robust Cost-Effective Spectrophotometric Method for Nb Determination in Refractory Nb-doped Gadolinium Zirconate: Overcoming Matrix Dissolution Challenges. [PDF]

Anal Sci Adv
ABSTRACT A simple, robust and cost‐effective analytical methodology was developed for the determination of niobium in highly refractory materials: Nb‐doped gadolinium zirconate (Gd2Zr2O7:Nb) and niobium pentoxide (Nb2O5). The challenge of digesting these matrices was successfully accomplished by establishing two independent dissolution procedures: (i ...
Verma P, Chandane A.
europepmc   +2 more sources

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
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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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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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Pyrochlore Compounds From Atomistic Simulations [PDF]

Frontiers in Chemistry, 2021
Pyrochlore compounds (A2B2O7) have a large applicability in various branches of science and technology. These materials are considered for use as effective ionic conductors for solid state batteries or as matrices for immobilization of actinide elements, amongst many other applications.
Timothy Connor, Oskar Cheong, Oskar Cheong, Oskar Cheong, Thomas Bornhake, Thomas Bornhake, Thomas Bornhake, Alison C. Shad, Rebekka Tesch, Rebekka Tesch, Rebekka Tesch, Mengli Sun, Mengli Sun, Zhengda He, Zhengda He, Andrey Bukayemsky, Victor L. Vinograd, Sarah C. Finkeldei, Sarah C. Finkeldei, Piotr M. Kowalski, Piotr M. Kowalski   +20 more
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