Mechanochemical synthesis, crystal structure and ion conduction in the Gd2Hf2−x Ti x O7 system

Cepeda-Sánchez, Nayeli M.; Díaz-Guillén, J.A.; Mączka, M.; Amador, Ulises; Fuentes, Antonio F.

doi:10.1007/s10853-017-1037-2

Cited by 22 publications

(9 citation statements)

References 39 publications

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“…The following group of research papers describes the use of mechanochemical methods for the synthesis and/or modification of different inorganic materials such as powder alloys [9], complex oxides [10], sulfides [11] and silicides [12]. Al-Joubouri and Suryanarayana [9] analyzed the phase formation and microstructural features of five different Fe-Cr-Ni powder mixtures subjected to high-energy mechanical milling.…”

Section: Methodsmentioning

confidence: 99%

“…Al-Joubouri and Suryanarayana [9] analyzed the phase formation and microstructural features of five different Fe-Cr-Ni powder mixtures subjected to high-energy mechanical milling. Cepeda-Sánchez et al [10] described the mechanochemical synthesis, structural peculiarities and oxygen ion conducting properties of the Gd 2 Hf 2-x Ti x O 7 system. Baláž et al [11] analyzed the effect of different experimental parameters on the evolution of Cu:S mixtures when milled in a planetary ball mill to obtain CuS and Cu 2 S. Bogala and Reddy [12] analyzed the reaction kinetics of a group of promising thermoelectric materials-metal-doped Mg silicides.…”

Section: Methodsmentioning

confidence: 99%

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Preface to the special section on mechanochemical synthesis

Fuentes

2017

J Mater Sci

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Preface to the special section on mechanochemical synthesis

Fuentes

2017

J Mater Sci

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“…Because both A- and B-site precursors, namely rare earth oxides and HfO 2 , are refractory in nature, synthesizing rare earth hafnates by the traditional solid-state route requires long calcination time and temperature greater than 1500 °C . Such demanding synthesis conditions cause obtained particles to suffer from inhomogeneous and coarse sample formation and poor sintering behavior with nonuniform size distribution.…”

Section: Introductionmentioning

confidence: 99%

Pyrochlore Rare-Earth Hafnate RE₂Hf₂O₇ (RE = La and Pr) Nanoparticles Stabilized by Molten-Salt Synthesis at Low Temperature

et al. 2019

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Complex oxides of the RE2Hf2O7 series are functional materials that exist in the fluorite or pyrochlore phase depending on synthesis method and calcination temperature. In this study, we investigate the process of synthesis, crystal structure stabilization, and phase transition in a series of RE hafnate compounds, synthesized by the coprecipitation process of a single-source complex hydroxide precursor followed with direct calcination or molten-salt synthesis (MSS) method. Phase pure RE2Hf2O7 (RE = Y, La, Pr, Gd, Er, and Lu) ultrafine nanostructured powders were obtained after calcinating the precursor in a molten salt at 650 °C for 6 h. Moreover, we demonstrate that the MSS method can successfully stabilize ideal pyrochlore structures for La2Hf2O7 and Pr2Hf2O7 in the nanodomain, which is not possible to achieve by direct calcination of the coprecipitated precursor at 650 °C. We propose mechanisms to elucidate the differences in these two synthesis methods and highlight the superiority of the MSS method for the production of RE hafnate nanoparticles.

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“…For example, having a cubic structure, oxygen-ion conducting pyrochlores rather often result from room-temperature mechanochemical synthesis. [15][16][17] Therefore, the possibility of lanthanide molybdates powder synthesis by room-temperature MS is a topical issue.…”

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Room‐temperature mechanochemical synthesis of RE molybdates: Impact of structural similarity and basicity of oxides

et al. 2021

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RE molybdates and tungstates are very important inorganic materials that have a high potential application in various fields: photoluminescence, optical fibers, laser materials, and mixed conductors. [1][2][3][4][5][6][7] Ln 6-x Zr x MoO 12-δ (Ln = La, Nd, Sm, Dy, Ho) Zr-doped molybdates, pure La 5.5 MoO 11.25 , pure and doped La 5.4 MoO 11.1 , and Ln 10 Mo 2 O 21 (Ln = Nd, Gd -Ho) have mixed electron-ion (electron-proton) conductivity and are promising materials for SOFC electrolytes and proton-conducting membranes. [5][6][7][8][9][10][11][12][13][14] Zirconium doping improves the stability of these materials to

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Mechanochemical synthesis, crystal structure and ion conduction in the Gd2Hf2−x Ti x O7 system

Cited by 22 publications

References 39 publications

Preface to the special section on mechanochemical synthesis

Preface to the special section on mechanochemical synthesis

Pyrochlore Rare-Earth Hafnate RE₂Hf₂O₇ (RE = La and Pr) Nanoparticles Stabilized by Molten-Salt Synthesis at Low Temperature

Room‐temperature mechanochemical synthesis of RE molybdates: Impact of structural similarity and basicity of oxides

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Mechanochemical synthesis, crystal structure and ion conduction in the Gd2Hf2−x Ti x O7 system

Cited by 22 publications

References 39 publications

Preface to the special section on mechanochemical synthesis

Preface to the special section on mechanochemical synthesis

Pyrochlore Rare-Earth Hafnate RE2Hf2O7 (RE = La and Pr) Nanoparticles Stabilized by Molten-Salt Synthesis at Low Temperature

Room‐temperature mechanochemical synthesis of RE molybdates: Impact of structural similarity and basicity of oxides

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Product

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Pyrochlore Rare-Earth Hafnate RE₂Hf₂O₇ (RE = La and Pr) Nanoparticles Stabilized by Molten-Salt Synthesis at Low Temperature