Preparation of Proton Conducting Sr-Doped LaPO4 Ceramics with the Spark Plasma Sintering Method

Koji Amezawa, Yoshito Nishikawa, Yoichi Tomii, Naoichi Yamamoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The spark plasma sintering (SPS) method was employed to prepare sintered specimens of proton conducting Sr-doped LaPO4 ceramics. The relative densities of the sintered Sr-doped LaPO4 were around 99% when higher sintering temperatures than 1050°C were applied for the SPS process, while only 93% of relative density was achieved with the conventional pressure-less sintering (PLS) method at 1200°C. Electrical conduction properties of the sintered samples with the SPS method at 1200°C were evaluated by using conductivity measurements at 500-930°C under 0.4-5 kPa of p(H2O) or p(D2O) and 0.01-100 kPa of p(O2). The specimen prepared with the SPS method showed similar conductivities and conduction properties as that prepared with the PLS method. These results suggested that the SPS method was a useful sintering technique to prepare proton conducting phosphate-based ceramics with a high density while keeping a feature of protonic conduction.

Original languageEnglish
Pages (from-to)1071-1078
Number of pages8
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number12
Publication statusPublished - 2003 Dec
Externally publishedYes


  • Lanthanum phosphate
  • Protonic conduction
  • Spark plasma sintering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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