Электронный каталог

Статья

Chebyshev, K.A.
Synthesis and Investigation of Solid Solutions Based on Praseodymium Oxide in a Pr&sub(6)O&SUB(11) – MoO&sub(3) System / K.A.Chebyshev, V.A.Turchenko, [a.o.]. – Text : electronic // Ceramics International. – 2025. – Vol. 51, No. 28, Pt. A. – P. 56773-56782. – URL: https://doi.org/10.1016/j.ceramint.2025.09.391. – Bibliogr.: 39.

To enhance mixed ionic-electronic conductivity in praseodymium oxide for SOFC applications, novel Mosubstituted Pr&sub(6)O&sub(11) solid solutions (0–16.67 mol.% MoO&sub(3)) were synthesized via solid-state reaction in air. Phase purity was confirmed by X-ray diffraction analysis, while homogeneity and uniformity were verified through EDX mapping. The system exhibits exceptional MoO&sub(3) solubility despite significant cation size and charge mismatch (r(Mo&sup(6+)) = 0.59 Å, c.n. = 6 vs. r(Pr&sup(3+)/Pr&sup(4+)) = 1.13/0.96 Å, c.n. = 8). The crystal structure was refined using high-resolution time-of-flight neutron diffraction data, confirming a disordered fluorite structure (space group Fm3m) with anomalous oxygen displacement (B&sub(iso) > 3 Å&sup(2)). Electrical properties, investigated via impedance spectroscopy, revealed a composition-dependent transition in conductivity. Below 11 mol.% MoO&sub(3), bulk conductivity decreased due to Pr&sup(4+) reduction and suppressed electronic contribution. Remarkably, at 11.11 mol.% MoO&sub(3), enhanced conduction yielded a maximum conductivity 3.2 × 10&sup(− 3) S/cm at 700 &sup(o)C, comparable to undoped Pr&sub(6)O&sub(11). Impedance spectra showed emergent low-frequency arcs above 600 &sup(o)C in Mo-rich compositions, possibly signifying activated oxygen-ion transport. The incorporation of molybdenum oxide into Pr&sub(6)O&sub(11) in an amount greater than 4 % increases the stability of the material during storage by preventing adsorption of atmospheric components. This study establishes Mo-doped Pr&sub(6)O&sub(11) as a promising electrode material for intermediate-temperature SOFCs.



Спец.(статьи,препринты) = С 36 - Физика твердого тела$
Спец.(статьи,препринты) = С 44 в - Новые химические реакции, соединения и реактивы
ОИЯИ = ОИЯИ (JINR)2025