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Praseodymium Orthoniobate and Praseodymium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties
Abstract
In this paper, the structural properties and the electrical conductivity of La1−xPrxNbO4+δ (x = 0.00, 0.05, 0.1, 0.15, 0.2, 0.3) and PrNbO4+δ are presented and discussed. All synthesized samples crystallized in a monoclinic structure with similar thermal expansion coefficients. The phase transition temperature between the monoclinic and tetragonal structure increases with increasing praseodymium content from 500 ◦C for undoped LaNbO4+δ to 700 ◦C for PrNbO4+δ. Thermogravimetry, along with X-ray photoelectron spectroscopy, confirmed a mixed 3+/4+ oxidation state of praseodymium. All studied materials, in humid air, exhibited mixed protonic, oxygen ionic and hole conductivity. The highest total conductivity was measured in dry air at 700 ◦C for PrNbO4+δ, and its value was 1.4 · 10−3 S/cm.
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- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma15062267
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Materials
no. 15,
ISSN: 1996-1944 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Dzierzgowski K., Wachowski S., Łapiński M., Mielewczyk-Gryń A., Gazda M.: Praseodymium Orthoniobate and Praseodymium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties// Materials -Vol. 15,iss. 6 (2022), s.2267-
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma15062267
- Sources of funding:
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- OPUS 2016/23/B/ST5/02137
- Verified by:
- Gdańsk University of Technology
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