Cold sintering-assisted low temperature fabrication of dense Ba5 Nb4 O15 ceramics

Authors

• Usa Sukkha
• Apichayaporn Teandam
• Phakkhananan Pakawanit
• Phitsamai Kamonpha
• Wanwilai Vittayakorn
• Phieraya Pulphol
• Naratip Vittayakorn

Publication Date

2026

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.

DOI

10.55713/jmmm.v36i2.2564

First Page

1

Last Page

11

Recommended Citation

Sukkha, Usa; Teandam, Apichayaporn; Pakawanit, Phakkhananan; Kamonpha, Phitsamai; Vittayakorn, Wanwilai; Pulphol, Phieraya; and Vittayakorn, Naratip (2026) "Cold sintering-assisted low temperature fabrication of dense Ba5 Nb4 O15 ceramics," Journal of Metals, Materials and Minerals: Vol. 36: No. 2, Article 4.
DOI: 10.55713/jmmm.v36i2.2564
Available at: https://digital.car.chula.ac.th/jmmm/vol36/iss2/4