Cold sintering-assisted low temperature fabrication of dense Ba\(_{5}\)Nb\(_{4}\)O\(_{15}\) ceramics

Usa SUKKHA; Apichayaporn TEANDAM; Phakkhananan PAKAWANIT; Phitsamai KAMONPHA; Wanwilai VITTAYAKORN; Phieraya PULPHOL; Naratip VITTAYAKORN

doi:10.55713/jmmm.v36i2.2564

Authors

Usa SUKKHA Department of General Science and Liberal Arts, King Mongkut’s Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon, 86160, Thailand; Advanced Materials Research Unit, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
Apichayaporn TEANDAM Advanced Materials Research Unit, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Department of Materials Science, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand
Phakkhananan PAKAWANIT Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand
Phitsamai KAMONPHA National Institute of Reference Laboratories, Department of Science Service, Ministry of Higher Education, Science, Research and Innovation, Bangkok, 10400, Thailand
Wanwilai VITTAYAKORN Advanced Materials Research Unit, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Department of Nanoscience and Nanotechnology, School of Integrated Innovative Technology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
Phieraya PULPHOL Advanced Materials Research Unit, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Department of Materials Science, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand
Naratip VITTAYAKORN Advanced Materials Research Unit, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Department of Chemistry, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i2.2564

Keywords:

Ba5Nb4O15 ceramic, Cold sintering process, Transient liquid phase, Low-temperature densification

Abstract

Abstract
This study presents a novel approach for fabricating Ba5Nb4O15 (BNO) ceramics at low sintering temperatures via the cold sintering process (CSP), using Ba(OH)2∙8H2O (BOH) as a transient liquid phase. CSP was performed under an external pressure of 10 MPa with a sintering temperature range of 150℃ to 300℃. Optimally, BNO-BOH ceramics achieved a relative density of 93.7 ± 0.43% when sintered at 250℃ for 1 h. Scanning electron microscopy (SEM) suggested that particle densification occurred via a dissolution-precipitation process, which filled pores and formed necks between particles. The study demonstrates that the residual liquid content is crucial for ceramic densification. Annealing the as-cold sintered BNO-BOH ceramics at 1000℃ for 1 h successfully eliminates the BaCO3 secondary phase. Furthermore, dielectric properties of annealed ceramics were also characterized at room temperature from frequency range of 20 Hz to 2 MHz. The dielectric permittivity is reported to be 39.2 and 0.01 for tan δ at 1.8 MHz. The cold sintering process provides an effective strategy to reduce the sintering temperature while achieving high relative density. This method offers a promising alternative for the fabrication of advanced ceramics.

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