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Electrical transport mechanisms of Neodymium-doped rare-earth semiconductors

Journal of Materials Science: Materials in Electronics, ISSN: 1573-482X, Vol: 33, Issue: 15, Page: 11632-11649
2022
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Article Description

This study reports the electrical properties of Nd-doped cerium oxide (CeO) films synthesized by microwave assisted hydrothermal using a two-point probe technique. Positron annihilation lifetime spectroscopy studies evidenced that, as the Nd content rises, a structural disorder occurs. This is caused by an increase in oxygen vacancies surrounded with Nd (defective clusters), with the mean lifetime components ranging between 290 and 300 ps. Particle size estimation showed values from 8.6 to 28.9 nm. Along with the increase of neodymium impurities, also the conductivity increases, due to the hopping conduction mechanism between defective species. This gives rise to a response time of only 6 s, turning these materials candidates to realize gas sensor devices. Ab initio investigations showed that the improved electric conduction is boosted mostly by the reduced Nd than the Ce, where the oxygen vacancies play a fundamental role.

Bibliographic Details

Isabela C. F. Vaz; Carlos Eugenio Macchi; Alberto Somoza; Leandro S. R. Rocha; Elson Longo; Luis Cabral; Edison Z. da Silva; Alexandre Zirpoli Simões; Giulia Zonta; Cesare Malagù; P. Mariela Desimone; Miguel Adolfo Ponce; Francisco Moura

Springer Science and Business Media LLC

Materials Science; Physics and Astronomy; Engineering

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