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Microwave dielectric properties of La5(Ti4B)O17 and Nd5(Ti4B)O17 (B = Cr, Fe) ceramics

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Abstract

Compositions in the A5B5O17 (A = La, Nd, B = Cr, Fe) series were processed through a mixed oxide solid state sintering route. X-ray diffraction revealed an orthorhombic (Pnnm) symmetry for La5Ti4FeO17 and monoclinic (P21/b) symmetry for Nd5Ti4FeO17, associated with the higher tolerance factor of Nd5Ti4FeO17 than Nd5Ti4CrO17. The compounds exhibited relative permittivity εr ~27–37, Quality factor Q × f o ~5,735–7,419 GHz and temperature coefficient of resonance frequency τf ~ −23.86 to −104 ppm/oC. The observed low density indicated that the microwave dielectric properties can be improved by improving the density, and τf can be tuned through zero via partial substitution of Sr at the A-site.

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Acknowledgments

The authors acknowledge the financial support of the Higher Education Commission of Pakistan under the IRSIP program and electro-ceramics group in facilitating the authors at the Electro-ceramics laboratory, Department of Material Science and Engineering Materials, University of Sheffield (UK). The authors also acknowledge the financial support extended by the Directorate of Science & Technology, KP, Pakistan for upgradation of the Materials Research Laboratory, Department of Physics, University of Peshawar.

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Authors and Affiliations

  1. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, 25120, Pakistan

    Raz Muhammad & Yaseen Iqbal

  2. Laboratory of Electrical Materials, Department of Electrical Engineering, Federal University of Santa Catarina, Florianopolis, Brazil

    Carlos Renato Rambo

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  1. Raz Muhammad
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  2. Yaseen Iqbal
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  3. Carlos Renato Rambo
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Correspondence to Yaseen Iqbal.

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Muhammad, R., Iqbal, Y. & Rambo, C.R. Microwave dielectric properties of La5(Ti4B)O17 and Nd5(Ti4B)O17 (B = Cr, Fe) ceramics. J Mater Sci: Mater Electron 26, 1918–1922 (2015). https://doi.org/10.1007/s10854-014-2630-7

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  • DOI: https://doi.org/10.1007/s10854-014-2630-7

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