Visualization of hydrogen isotope distribution in yttrium and cobalt doped barium zirconates

M. Khalid Hossain, Hajime Tamura, Kenichi Hashizume

Research output: Contribution to journalArticle

Abstract

Tritium (T) distributions in yttrium (Y) and cobalt (Co) doped barium-zirconates (BaZrO3) were visualized by imaging plate (IP) technique using HT gas (T/H = 10−4, ∼1.3 kPa) under various exposure temperatures (623 to 1273 K) and exposure times (5 min to 16 h). Two types of specimens, BaZr0.9Y0.1O3-α (BZY) and BaZr0.955Y0.03Co0.015O3-α (BZYC), were prepared with conventional powder metallurgy: disk-shaped specimens were obtained with more than 97% of the theoretical densities. With IP method, uniform tritium distribution was found on the surface of both T-exposed specimens. The T distributions of the cross sections of the cut-in-half specimens were also examined with IP, which showed that more T was diffused into BZYC compared to BZY. The diffusivities of T and hydrogen solubility were determined by the T concentration profiles for the BZY and BZYC samples at different exposure conditions. Almost one order higher solubility and diffusivity for BZYC than BZY was found. It suggests that only a small amount sintering-aid cobalt doping along with yttrium may play a vital role of enhancement of electrochemical activity of the proton conducting BaZrO3 under HT exposure condition.

Original languageEnglish
Article number152207
JournalJournal of Nuclear Materials
Volume538
DOIs
Publication statusPublished - Sep 2020

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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