Author:
Smirnova O.,Kumada N.,Takei T.,Yonesaki Y.,Yashima M.,Kinomura N.
Abstract
Single-crystal, synchrotron powder X-ray diffraction and neutron powder diffraction studies of the novel pyrochlore-type compound with the structural formula K0.88(OH)0.54H1.66(H2O)1.04Nb2O6 suggests that the water molecules are located in 32e sites, and the hydroxide ions and potassium ions are located in 16d sites with a significant amount of `free' protons in 96g sites. The total weight loss at temperatures up to 773 K is only about 8%, suggesting the oxygen escape from 48f sites can be excluded and `free' protons must be preserved in the structure. The bulk conductivity in ambient air reaches 10−2 S cm−1 at 623 K. Owing to the extended stability range and resistance to water solubility, the compound can be considered as a candidate for intermediate temperature solid-oxide fuel-cell applications.
Publisher
International Union of Crystallography (IUCr)
Subject
General Biochemistry, Genetics and Molecular Biology,General Medicine
Cited by
6 articles.
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