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Synthesis and characterization of Nd3+-doped Ce0.6Zr0.4O2 and its doping significance on oxygen storage capacity

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Abstract

Cerium and cerium-based oxides are found to be an important element in three-way catalytic converter (TWC). The effective utilization of TWC is found to be reduced due to thermal loading which results in structural deformation of ceria. Doping Zr4+ into the rare earth element can increase the oxygen storage capacity and thermal stability. Hence, an attempt was made to study the oxygen storage capacity and thermal stability of ceria by doping Zr4+ and Nd3+. Cerium-based nanocrystallite in the composition of Ce0.6Zr0.4−xNd1.3xO2 (0 ≤ x ≤ 0.4) was prepared by sol–gel synthesize technique with citric acid as a gel-forming agent. X-ray diffraction (XRD) result shows that doping Nd3+ into ceria lattice forms homogenous solid solution of cubic fluorite structure up to 25 % of substitute only. Doping higher amount of Nd3+ into ceria lattice leads to the formation of Nd2O3. Raman spectrum study confirms that oxygen storage capacity band is present in Ce0.6Zr0.4O2 and Ce0.6Zr0.3Nd0.13O2. The oxygen storage capacity was calculated through weight loss of the sample during the second heating cycle with cyclic heating from 30 to 800 °C in thermogravimetric analysis (TGA). The TGA study reveals that the oxygen storage capacity of Ce0.6Zr0.4O2 decreases after the substitution of Nd3+, which is due to the larger ionic radius of Nd3+ compared with that of Zr4+ and CeO2.

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Authors and Affiliations

  1. Siddaganga Institute of Technology, Tumkur, Karnataka, 572103, India

    Natesan Shanmuga Priya

  2. Indian institute of Technology, Guwahati, 781039, India

    Chandramohan Somayaji & S. Kanagaraj

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  1. Natesan Shanmuga Priya
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  2. Chandramohan Somayaji
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  3. S. Kanagaraj
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Correspondence to Natesan Shanmuga Priya.

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Priya, N.S., Somayaji, C. & Kanagaraj, S. Synthesis and characterization of Nd3+-doped Ce0.6Zr0.4O2 and its doping significance on oxygen storage capacity. Rare Met. 40, 231–236 (2021). https://doi.org/10.1007/s12598-016-0698-3

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  • DOI: https://doi.org/10.1007/s12598-016-0698-3

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