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Fast synthesis of Na2Ti3O7 system synthesized by microwave-assisted hydrothermal method: Electrical properties

2020; Elsevier BV; Volume: 46; Issue: 15 Linguagem: Inglês

10.1016/j.ceramint.2020.06.160

1873-3956

L.A.L. Basilio, Francis Xavier, José Carlos Calado Sales Júnior, Jean Carlos Silva Andrade, José Anglada Rivera, L. Aguilera, R.S. Silva, J. Rodríguez‐Hernández, Javier Perez de Cruz, Y. Leyet,

Chemical Synthesis and Characterization

Sodium titanate Na 2 Ti n O 2n+1 (2 ≤ n ≤ 9) is a well-known semiconductor that exhibits interesting electrical properties allowing numerous applications, such as: electrodes for solid-state batteries. In this work, we reported a novel, fast and simple route to produce sodium titanate (Na 2 Ti 3 O 7 - NT) structures at low temperature and short time, by using microwave-assisted hydrothermal method . The NT powder synthesis was performed at 200 °C for 1 h and 4 h. Afterward, the as-synthetized powders were sintered to 900 °C for 1 h. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and complex impedance spectroscopy . It was identified a phase mixture of the polymorphs Na 2 Ti 3 O 7 and Na 2 Ti 6 O 13 with elongated rod-like morphology. Both samples showed a majority Na 2 Ti 3 O 7 (≥95%) crystalline phase, as confirmed by Rietveld refinement . After ceramics sintering the total dc conductivity values between of 10 -6 S/cm and 10 -7 S/cm were achieved.