Microwave absorption and infrared performance of Sm0.5Sr 0.5Co1-xNixO3 (0 ≤ x ≤ 1.0) with the K2NiF4 structure

Le Chen, Chunhua Lu, Yi Lu, Zhenggang Fang, Yaru Ni, Zhongzi Xu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Sm0.5Sr0.5Co1-xNixO3 (0 ≤ x ≤ 1.0, SSCN, in short) with a K2NiF4 structure has been successfully prepared by a conventional solid-state reaction as a microwave absorber. The effects of Ni incorporation on the structure, electrical conductivity, infrared emissivity and microwave-absorbing properties are investigated in detail. XRD results show that the spinel structure is preferred to the perovskite structure for Ni-containing compounds. The infrared spectra of K2NiF4-type nickelates are recorded and discussed on the basis of their structural peculiarities. The Ni doping concentration could contribute to the decrease of electrical conductivity; in contrast, the infrared emissivity is increased. Moreover, microwave-absorbing properties in the frequency range 2-18 GHz at room temperature are sensitive to the Ni content. The complex permittivity, complex permeability and electromagnetic loss tangent have a sudden step change at a certain frequency. An optimal reflection loss of -14.5 dB is reached at 13.1 GHz with a matching thickness of 2 mm.

Original languageEnglish
Pages (from-to)3967-3972
Number of pages6
JournalRSC Advances
Volume3
Issue number12
DOIs
StatePublished - 28 Mar 2013

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