Molten-salt synthesis of Ba5−xSrxNb4O15 solid solutions and their enhanced humidity sensing properties

Guo Jin Ji, Le Xi Zhang, Meng Ya Zhu, Si Meng Li, Jing Yin, Li Xin Zhao, Bradley D. Fahlman, Li Jian Bie

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Layered perovskite-type niobates A5Nb4O15 (A = Ba, Sr) are thought to be good candidates for microwave dielectric and water-splitting applications, but traditional solid-state syntheses of these compounds usually require high temperatures and complicated procedures. In this work, Ba5−xSrxNb4O15 (x = 0 − 5) perovskite solid solutions were obtained using a facile molten salt synthetic method. The crystal structure of Ba5−xSrxNb4O15 solid solutions were characterized by X-ray diffraction (XRD). Crystal structure parameters with different Sr2+ concentrations show that the lattice parameters and unit cell volumes of Ba5−xSrxNb4O15 decrease with increasing [Sr2+]. The humidity sensing behavior of Ba5−xSrxNb4O15 solid solutions was investigated over a wide relative humidity (RH) range, from 11% to 95%. Ba2Sr3Nb4O15 shows the highest sensitivity among the obtained samples with a humidity hysteresis of ca. 4% RH. The response-recovery times of the Ba2Sr3Nb4O15 sensor are only 2 s and 17 s as the humidity alternates between 11% and 95% RH, respectively, showing excellent potential as a humidity sensing material for practical applications.

Original languageEnglish
Pages (from-to)477-483
Number of pages7
JournalCeramics International
Volume44
Issue number1
DOIs
StatePublished - Jan 2018

Keywords

  • Humidity sensor
  • Molten salt method
  • Niobates
  • Perovskite

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