|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-34: Sintering Additives NiO and CuO: Solid Solubility in BaZr0.85Y0.15O3−δ Estimated from Magnetometry
||Michael Knight, Ivar Reimanis
|On-Site Speaker (Planned)
NiO or CuO additions reduce sintering temperatures and increase grain growth in proton conducting oxide yttrium-doped barium zirconate (BZY). For NiO additive, formation of a liquid impurity phase BaY2NiO5 during processing has been observed and proposed to be a major contributor. It is believed the Ni cations play a critical role in ion exchange and diffusion within the grains as well as at grain boundaries, but the exact mechanism remains controversial. Solid solubility of Ni(II) has been previously estimated by others to be around 1% on the perovskite B-site from lattice parameter changes. In this work, highly sensitive SQUID magnetometry is used to track effective magnetic moments of Ni(II) and Cu(II) substituted for 0.5% - 2.0% Zr cations. Decreasing moment with increasing dopant concentration suggest a secondary phase forms at lower concentrations than previously estimated and solid solubility may be less than 1%.