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Micro-structure and microwave dielectric properties of Cerium oxide with Nd/Y diatomic substitution

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Abstract

Cerium oxide (CeO2) ceramics with neodymium/yttrium (Nd/Y) diatomic substitution had been prepared, aiming at exploring the relationships between structures and microwave dielectric properties. After substitution, the CeO2 ceramics were still indexed as a pure CeO2 phase belonged to Fm-3 m (225) group, meanwhile, the Nd/Y ions showed disorderly distributions to occupy the position of cerium atoms (Ce) since no superlattice diffraction peak was detected. The cell volume of the substituted CeO2 ceramics changed regularly with the changing ratio of Nd/Y ions owing to the different ion radii of Nd and Y ions. The surface structure had been characterized by grain size, which dropped sharply when the atomic ratio of Nd/Y changed from 4:1 to 3:2, and then tended to level off. The dielectric constant (εr) of the ion-substituted CeO2 ceramics, which was mainly affected by porosity, polarizability, and defects, changed from 20.78 to 22.02 with different Nd/Y ratios. The quality factor (Q × f) values of the substituted CeO2 ceramics, which determined by packing fraction, grain size, and relative density, increased from 40,000 GHz to 77,000 GHz when the Nd/Y ratio changed from 4:1 to 1:4. The temperature coefficient of resonance frequency (τf) of the substituted CeO2 ceramics increased with the increasing of Y ion ratio, and the variation trend was consistent with the trend of crystal lattice energy.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work is supported by the projects from the Fundamental Research Funds for the Central Universities under Grant No. 2020ZDPYMS12.

Funding

This study was funded by the Fundamental Research Funds for the Central Universities (Grant No. 2020ZDPYMS12).

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Authors and Affiliations

  1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, China

    Wang-Suo Xia, Wen-Hu Zhang, Ying Wang, Ming-Xue Li & Li-Wei Shi

  2. School of Environment and Material Engineering, Yantai University, Yantai, 264005, China

    Hai-Tao Wu

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Contributions

Wang-Suo Xia designed the study. WSX, WHZ, YW, MXL, LWS, HTW performed the experiments and analyzed results. WSX and WHZ wrote the manuscript. WSX, YW, and HTW discussed the results and commented on the manuscript. All authors reviewed the manuscript.

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Correspondence to Wang-Suo Xia.

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Xia, WS., Zhang, WH., Wang, Y. et al. Micro-structure and microwave dielectric properties of Cerium oxide with Nd/Y diatomic substitution. J Mater Sci: Mater Electron 33, 8027–8034 (2022). https://doi.org/10.1007/s10854-022-07953-z

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