Crystallization in rapid quenching of La0.33NbO3 melt

Torii, Yasuyoshi; Sekiya, T.; Yamamoto, Tetsuo

doi:10.1016/0025-5408(82)90022-8

Cited by 19 publications

(3 citation statements)

References 13 publications

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“…The analogous system containing B 5+ cations, Li 3x La 1/3−x NbO 3 , possesses an A-site deficient perovskite-structured phase for 0 < x < ≈0.06 [380,381] and also forms a disordered cubic phase at high temperatures [382]. Its idealized structure at ambient temperature is similar to that of Li 3x La 2/3−x TiO 3 , except that the 'La-rich' layers are 2 3 occupied, the 'La-poor' ones are empty (figure 29) and it is best described using an orthorhombic unit cell of size a ∼ √ 2a perov , b ∼ √ 2a perov , c ∼ 2a perov [361,381,[383][384][385].…”

Section: 16mentioning

confidence: 99%

Superionics: crystal structures and conduction processes

2004

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Superionic conductors are compounds that exhibit exceptionally high values of ionic conductivity within the solid state. Indeed, their conductivities often reach values of the order of 1 −1 cm −1 , which are comparable to those observed in the molten state. Following Faraday's first observation of high ionic conductivity within the solids β-PbF 2 and Ag 2 S in 1836, a fundamental understanding of the nature of the superionic state has provided one of the major challenges in the field of condensed matter science. However, experimental and theoretical approaches to their study are often made difficult by the extensive dynamic structural disorder which characterizes superionic conduction and the inapplicability of many of the commonly used approximations in solid state physics. Nevertheless, a clearer picture of the nature of the superionic state at the ionic level has emerged within the past few decades. Many different techniques have contributed to these advances, but the most significant insights have been provided by neutron scattering experiments and molecular dynamics simulations. This review will summarize the state of current knowledge concerning the crystal structures and conduction processes of superionic conductors, beginning with a comparison of the behaviour of two of the most widely studied binary compounds, AgI and β-PbF 2 . Each can be considered a parent of two larger families of highly conducting compounds which are related by either chemical or structural means. These include perovskite-structured oxides and Li + containing spinel-structured compounds, which have important commercial applications in fuel cells and lightweight batteries, respectively. In parallel with these discussions, the relative importance of factors such as bonding character and the properties of the mobile and immobile ions (charge, size, polarizability, etc) in promoting the extensive lattice disorder which characterizes superionic behaviour will be assessed and the possibilities for predicting a priori which compounds will display high ionic conductivity discussed.

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Section: 16mentioning

confidence: 99%

Superionics: crystal structures and conduction processes

2004

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“…Moreover, a cubic La NbO has been quenched from high temperature (19) and -¸n NbO with monoclinic symmetry has been prepared under hydrothermal conditions (20).…”

Section: Studies On Lamentioning

confidence: 99%

Modulated Structure of La1/3−xLi3xNbO3 0≤x≤0.06 Perovskite-Related Materials

García-Martín

Alario-Franco

1999

Journal of Solid State Chemistry

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“…17 It includes a fast melting and solidication procedure which shows many advantages, such as homogenously raw material mixing at atomic scale, efficient and convenient process, and more importantly, highly textured materials can be prepared. [18][19][20] Therefore, in order to obtain solid electrolyte with high oxide-ion conductivity at intermediate temperature, we use this method to prepare La 10 Si 6 O 27 material as it possesses the highest conductivity in apatite-type rare-earth silicates. 21,22 First, lanthanum oxide (La 2 O 3 , 99.99%) and silicon oxide (SiO 2 , 99.99%) were precalcined at 1000 C for 1 h to remove the adsorptive water and carbon dioxide.…”

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confidence: 99%