  Proton-conducting oxides are potential materials for electrochemical devices
such as fuel cells, hydrogen pumps, hydrogen sensors, and the tritium
purification and recovery system in nuclear fusion reactors. The hydrogen
concentration in oxide materials is important, but its precise measurement is
difficult. In this study, thermal desorption spectroscopy (TDS) was used to
investigate hydrogen dissolution and release behavior in proton-conducting
oxides, yttrium (Y), and cobalt (Co) doped barium-zirconates in the temperature
range of 673-1273 K using deuterium (D2) and heavy water (D2O). Specimens were
prepared with conventional powder metallurgy: the powder of three zirconates,
BaZr0.9Y0.1O3-a (BZY), BaZr0.955Y0.03Co0.015O3-a (BZYC), and CaZr0.9In0.1O2.95
(CZI) was pressed into discs and fired in the air at 1873 K for 20 h. The
densities of the sintered BZY, BZYC, and CZI specimens were 98 percent, 99.7
percent, and 99.5 percent of the theoretical densities respectively. XRD, SEM,
and EDX were performed for the structural and morphological analysis of the
sintered samples. From TDS measurement, a similar trend of
temperature-dependent hydrogen solubility was obtained for all samples compared
to the tritium imaging plate (TIP) methods literature data of HT- and
DTO-exposed samples. To compare the experimental results of the deuterium
desorption profile derived by TDS analysis, the simulation code of the tritium
migration analysis program, version 4 (TMAP4) was employed.
