Single crystal growth of iridates without platinum impurities

Kim, Jimin; Kim, Hoon; Kim, Hyun-Woo J.; Park, Sunwook; Kim, Jin-Kwang; Kwon, Junyoung; Kim, Jungho; Woo, Seo, Hyeong; Kim, Jun Sung; Kim, B. J.

doi:10.1103/physrevmaterials.6.103401

Cited by 2 publications

(1 citation statement)

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“…We note that our crystals grown in an iridium crucible have the lattice structure of space group I4 1 /acd (ref. 54) and shows no sign of glide symmetry breaking distortions previously reported 55 .…”

Section: Discussionsupporting

confidence: 49%

Hydrogeochemical anomalies associated with the 2017 MW 5.5 Pohang earthquake in South Korea

Kim¹,

Lee²

2020

Preprint

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The 2017 MW 5.5 Pohang earthquakes, which were known as triggered by enhanced geothermal system (EGS) stimulations, had significant effects on the groundwater system. This study aimed to identify the hydrogeochemical anomalies and to understand the response mechanisms of groundwater system to the earthquake. For this, the environmental isotopes (222Rn, Sr, 2H, and 18O), major ions, and time-series data (groundwater level, temperature, and electrical conductivity) were analyzed. Principal component analysis (PCA) was also employed. The results from time-series data showed the anomalies in the groundwater wells located near the epicenter. The hydrochemical parameters including stable isotopes data of 2H and 18O showed the different change patterns among groundwater wells before/after the earthquakes, which were related to the distance from epicenter, faults, and seawater. The environmental isotopes, radon and strontium, suggested the possible mechanisms underlying the effects of earthquakes by spatial distributions, such as seawater intrusion, water-rock interactions, shallow and deep aquifer mixing, deep fluid upwelling, and bedrock fracture opening. With this, the main cluster of PCA results was also distributed along these isotope concentration gradients. Our findings proved the usefulness of environmental isotopes and hydrogeochemical parameters to understand the earthquake-related changes in groundwater system. These studied parameters and the adopted methods would be positively applied for other earthquake zones.

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Section: Discussionsupporting

confidence: 49%