Studies of rubidium selenate with secondary phase of RbOH under humidified reducing atmosphere

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Standard

Harvard

APA

CBE

MLA

Vancouver

Author

Bibtex

@article{24cc7e33bc214c839bab823e86b3537f,
title = "Studies of rubidium selenate with secondary phase of RbOH under humidified reducing atmosphere",
publisher = "Elsevier BV",
author = "Berceste Beyribey and Jonathan Hallinder and Poulsen, {Finn Willy} and Nikolaos Bonanos and Mogensen, {Mogens Bjerg}",
year = "2012",
doi = "10.1016/j.jallcom.2012.08.034",
volume = "545",
pages = "85--89",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",

}

RIS

TY - JOUR

T1 - Studies of rubidium selenate with secondary phase of RbOH under humidified reducing atmosphere

A1 - Beyribey,Berceste

A1 - Hallinder,Jonathan

A1 - Poulsen,Finn Willy

A1 - Bonanos,Nikolaos

A1 - Mogensen,Mogens Bjerg

AU - Beyribey,Berceste

AU - Hallinder,Jonathan

AU - Poulsen,Finn Willy

AU - Bonanos,Nikolaos

AU - Mogensen,Mogens Bjerg

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - <p>The high temperature properties of Rb<sub>2</sub>SeO<sub>4</sub> have been studied by calorimetry, impedance spectroscopy and X-ray powder diffraction. As synthesized, Rb<sub>2</sub>SeO<sub>4</sub> includes a second phase of Rb<sub>2</sub>SeO<sub>3</sub>, which can be eliminated upon heating the compound. As expected, no conductivity is observed in dry (pH<sub>2</sub>O &lt; 0.001 bar) air. By changing to humidified (pH<sub>2</sub>O = 0.1 bar) air at 176 deg. C, the conductivity increases sharply from 8.6·10<sup>-8</sup> to 1.7·10<sup>-6</sup> S cm<sup>-1</sup>. Under humidified (pH<sub>2</sub>O = 0.1 bar) reducing atmosphere (9%H<sub>2</sub> in N<sub>2</sub>), the conductivity increases to 2.0·10<sup>-4</sup> S cm<sup>-1</sup> at 317 C. Degradation of Rb<sub>2</sub>SeO<sub>3</sub> and Rb<sub>2</sub>SeO<sub>4</sub> to form RbOH, which is known as a proton conductor, are thought to be responsible for the observed conductivity in humidified atmospheres. Our observations may explain the conductivity rise in other solid acid electrolytes, including sulfate and selenate groups, around their decomposition temperatures, in humidified atmospheres.<br/> 2012 Elsevier B.V. All rights reserved.</p>

AB - <p>The high temperature properties of Rb<sub>2</sub>SeO<sub>4</sub> have been studied by calorimetry, impedance spectroscopy and X-ray powder diffraction. As synthesized, Rb<sub>2</sub>SeO<sub>4</sub> includes a second phase of Rb<sub>2</sub>SeO<sub>3</sub>, which can be eliminated upon heating the compound. As expected, no conductivity is observed in dry (pH<sub>2</sub>O &lt; 0.001 bar) air. By changing to humidified (pH<sub>2</sub>O = 0.1 bar) air at 176 deg. C, the conductivity increases sharply from 8.6·10<sup>-8</sup> to 1.7·10<sup>-6</sup> S cm<sup>-1</sup>. Under humidified (pH<sub>2</sub>O = 0.1 bar) reducing atmosphere (9%H<sub>2</sub> in N<sub>2</sub>), the conductivity increases to 2.0·10<sup>-4</sup> S cm<sup>-1</sup> at 317 C. Degradation of Rb<sub>2</sub>SeO<sub>3</sub> and Rb<sub>2</sub>SeO<sub>4</sub> to form RbOH, which is known as a proton conductor, are thought to be responsible for the observed conductivity in humidified atmospheres. Our observations may explain the conductivity rise in other solid acid electrolytes, including sulfate and selenate groups, around their decomposition temperatures, in humidified atmospheres.<br/> 2012 Elsevier B.V. All rights reserved.</p>

KW - Rubidium selenate

KW - High temperature X-ray diffraction

KW - Impedance spectroscopy

KW - Thermal analysis

U2 - 10.1016/j.jallcom.2012.08.034

DO - 10.1016/j.jallcom.2012.08.034

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

VL - 545

SP - 85

EP - 89

ER -