Structural and electrical properties of strontium substituted Y2BaNiO5
authors Nasani, N; Ramasamy, D; Antunes, I; Singh, B; Fagg, DP
nationality International
journal JOURNAL OF ALLOYS AND COMPOUNDS
author keywords Haldane energy gap; Barium yttrium nickelate; Electrical conductivity; Solid solution; Protonic ceramics
keywords MAGNETIC-PROPERTIES; HALDANE-GAP; R2BANIO5 R; DIFFRACTION; OXIDES; POLYMORPHISM; HOLE; YB
abstract The Y-2 xSrxBaNiO5 (x = 0, 0.1, 0.2 and 0.3) acceptor substituted system has been synthesized by solid state reaction. Structural and microstructural properties have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Lattice volume is shown to decrease linearly with increasing Sr content until composition x = 0.2, highlighting the limit of the solid solution. The electrical response in the temperature range (700-100 degrees C) was assessed by A.C. impedance spectroscopy in wet and dry O-2 and N-2 atmospheres. Conductivity measurements as a function of oxygen partial pressure (pO(2)) were also performed. The data reveal that the conductivity Y2BaNiO5 can be increased by one and half orders magnitude by Sr-doping and is independent of both water vapour and oxygen partial pressures (pH(2)O and pO(2)). The low activation energy for electrical conduction (0.216-0.240 eV) suggests a thermally activated electron hopping mechanism, while the observed pO(2) and pH(2)O independence of conductivity suggests that charge compensation for Sr is predominantly by formation of Ni3+ rather than formation of oxygen vacancies. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0925-8388
year published 2015
volume 620
beginning page 91
ending page 96
digital object identifier (doi) 10.1016/j.jallcom.2014.09.127
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000344751800016
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