Results 11 to 20 of about 4,273 (189)

Universal geometric frustration in pyrochlores [PDF]

Nature Communications, 2018
The family of pyrochlore complex oxides includes many materials of fundamental or practical interest, such as spin ices and dielectrics. Trump et al. show that flexibility of the pyrochlores’ structure leads to local displacements that explain some of ...
B. A. Trump, S. M. Koohpayeh, K. J. T. Livi, J.-J. Wen, K. E. Arpino, Q. M. Ramasse, R. Brydson, M. Feygenson, H. Takeda, M. Takigawa, K. Kimura, S. Nakatsuji, C. L. Broholm, T. M. McQueen   +13 more
doaj   +4 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
openaire   +2 more sources

Effect of Preparation Method and Ni²⁺ Substitution on the Structural, Thermal, and Optical Properties of Nanocrystalline Lanthanum Zirconate Pyrochlore

Crystals, 2021
In order to establish the effective application of materials in a particular area, it is important to first investigate the physical and chemical properties, such as the crystallinity, structure, and the optical and surface properties.
Fahad Alharthi, Rizwan Wahab, Salim Manoharadas, Basel F. Alrayes, Naushad Ahmad   +4 more
doaj   +1 more source

Novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) ternary system: synthesis, structural and electrical properties

Journal of Materials Research and Technology, 2020
The purpose of this work is to present a systematic study related to the doping mechanism, structural and electrical properties of the novel pyrochlores in the Bi2O3-Fe2O3-Ta2O5 (BFT) system.
F.A. Jusoh, K.B. Tan, Z. Zainal, S.K. Chen, C.C. Khaw, O.J. Lee   +5 more
doaj   +1 more source

Stepwise Reduction of Ruthenium and Growth of Magnetic Structure During Hydrothermal Crystallisation of SrRu₂O₆ from KRuO₄. [PDF]

Angew Chem Int Ed Engl
In situ neutron powder diffraction data collected while heating the Ru(VII) reagent KRuO4 in the presence of aqueous Sr2+ reveal the crystallisation of a Ru(VI) oxyhydroxide before the expected Ru(V) oxide; at the same time evolution of antiferromagnetism in the final SrRu2O6 product follows the growth of its crystal structure.
Crossman M, Hiley CI, Playford HY, Goodway CM, Smith RI, Hansen TC, Walton RI.   +6 more
europepmc   +2 more sources

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
openaire   +3 more sources

Hydrothermal synthesis, characterization and catalytic performance of La3+ and Sm3+ - doped Bi2Mn2O7 nanocatalysts for Biginelli reactions [PDF]

Journal of Nanostructures, 2019
La3+ and Sm3+ - doped Bi2Mn2O7 nanocatalysts were synthesized in 1 M NaOH aqueous solution, via a stoichiometric 1:1 Bi:Mn molar ratio hydrothermal method at 180 °C for 48 h. Bi(NO3)3, MnO2, La(NO3)3 and Sm2O3 were used as raw materials.
Shahin Khademinia, Mahdi Behzad
doaj   +1 more source

Electrical and catalytic properties of some oxides with the fluorite or pyrochlore structure: Part 2: Catalytic oxidation of carbon monoxide [PDF]

, 1984
The catalytic properties of mixed oxides with the fluorite or pyrochlore structure were investigated using CO oxidation. The presence of ions with a variable valence state, the size of the ions and especially the extent of pyrochlore ordering affect ...
Bosch, H., Burggraaf, A.J., Dijk, M.P. van, Gellings, P.J., Maat, J.J.H. ter, Roelofs, G., Velde, G.M.H. van de   +6 more
core   +9 more sources

Semi-Empirical Predictions for Hardness of Rare Earth Pyrochlores; High-Permittivity Dielectrics and Thermal Barrier Coating Materials

East European Journal of Physics, 2023
Herein, we have formulated a simplistic semi-empirical model for Vicker’s hardness of rare earth based pyrochlore compounds. We have considered the  structured 97 pyrochlore compounds for Vicker’s hardness calculations.
Rekha Bhati, Dheerendra Singh Yadav, Preeti Varshney, Rajesh Chandra Gupta, Ajay Singh Verma   +4 more
doaj   +1 more source

Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores

Journal of Asian Ceramic Societies, 2020
Subsolidus Bi3.36Fe2.08+xNb2.56−xO14.56−x (BFN) pyrochlores prepared by solid-state reaction at 950°C over 48 h showed a moderate solid solution range of −0.24 ≤ x ≤ 0.48.
F.A. Jusoh, K.B. Tan, Z. Zainal, S.K. Chen, C.C. Khaw, O.J. Lee   +5 more
doaj   +1 more source