Electrical and catalytic properties of some oxides with the fluorite or pyrochlore structure. CO oxidation on some compounds derived from Gd2Zr2O7

Abstract

The catalytic properties of some mixed zirconates with the pyrochlore or fluorite structure have been investigated using CO oxidation as the test reaction. The presence of terbium ions, leading to mixed conductivity, and the extent of pyrochlore ordering affect the kinetic behaviour and the catalytic activity of the investigated materials. Bismuth-containing compounds show an increased rate of reoxidation.

The solubility of cerium in La2Ti2O7 by DFT + U calculations

“…They demonstrate an enormous range of physical, chemical, and electronic properties depending on the composition and the degree of disorder on the cation sites [13]. Therefore, they have been used as hosts for oxidation catalysts [14], ceramic thermal barrier coatings [15,16], and solid electrolytes in high temperature fuel cells [17]. In particular, these materials have long been considered as the potential host phases for the immobilization of the "minor" actinides and plutonium [2,18].…”

Fabrication of LaGdZr2O7 transparent ceramic

“…Pyrochlore rare-earth zirconate and hafnate (RE 2 Zr 2 O 7 and RE 2 Hf 2 O 7 ) have attracted much attention of many researchers due to their various interesting applications such as thermal barrier coating, 1 solid electrolytes for solid oxide fuel cells (SOFCs), 2 catalysts, 3,4 matrices for immobilization of highly active radionuclides from nuclear wastes 5 and host materials for scintillators. 6 Except for high density and high effective atomic number, the transparency is critical for scintillator materials.…”

Morphology-controlled synthesis of yttrium hafnate by oxalate co-precipitation method and the growth mechanism

“…This structure exhibits space group Fm3m (2 2 5) and can be considered as an ordered defective fluorite [1]. This type compounds have been researched for solid-oxide fuel cells [2], dielectric materials [3][4][5], thermal barrier coatings [6,7], catalysts [8], and immobilization of actinides in nuclear waste [9,10]. In the nuclear field, a recent interest is their potential applications as materials for transmutation of the so-called minor actinides, americium and curium [11].…”