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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on As2O3 by Materials Project

As2O3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two As2O3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent As3+ sites. In the first As3+ site, As3+ is bonded in a distorted T-shaped geometry to three O2- atoms. There is two shorter (1.82 Å) and one longer (1.85 Å) As–O bond length. In the second As3+ site, As3+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are a spread of As–O bond distances ranging from 1.82–1.84 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two As3+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent As3+ atoms. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As2O3 by Materials Project

As2O3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two As2O3 sheets oriented in the (0, 1, 0) direction. there are two inequivalent As3+ sites. In the first As3+ site, As3+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are a spread of As–O bond distances ranging from 1.82–1.84 Å. In the second As3+ site, As3+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of As–O bond distances ranging from 1.81–1.83 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two As3+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two As3+ atoms. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on As2O3 by Materials Project

As2O3 is diamond structured and crystallizes in the cubic Fd-3m space group. The structure is zero-dimensional and consists of eight chebi:30621 molecules. As3+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent O2- atoms. All As–O bond lengths are 1.83 Å. O2- is bonded in a bent 120 degrees geometry to two equivalent As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KAs4BrO6 by Materials Project

K(As2O3)2Br crystallizes in the hexagonal P6/mmm space group. The structure is two-dimensional and consists of one hydrobromic acid molecule and one K(As2O3)2 sheet oriented in the (0, 0, 1) direction. In the K(As2O3)2 sheet, K1+ is bonded to twelve equivalent O2- atoms to form edge-sharing KO12 cuboctahedra. All K–O bond lengths are 3.17 Å. As3+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All As–O bond lengths are 1.84 Å. O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two equivalent As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KAs4IO6 by Materials Project

K(As2O3)2I crystallizes in the hexagonal P6/mmm space group. The structure is two-dimensional and consists of one hydriodic acid molecule and one K(As2O3)2 sheet oriented in the (0, 0, 1) direction. In the K(As2O3)2 sheet, K1+ is bonded to twelve equivalent O2- atoms to form edge-sharing KO12 cuboctahedra. All K–O bond lengths are 3.19 Å. As3+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All As–O bond lengths are 1.84 Å. O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two equivalent As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KAs4ClO6 by Materials Project

(K(As2O3)2)2Cl2 crystallizes in the hexagonal P6/mmm space group. The structure is two-dimensional and consists of one hydrochloric acid molecule and one K(As2O3)2 sheet oriented in the (0, 0, 1) direction. In the K(As2O3)2 sheet, K1+ is bonded to twelve equivalent O2- atoms to form edge-sharing KO12 cuboctahedra. All K–O bond lengths are 3.17 Å. As3+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All As–O bond lengths are 1.84 Å. O2- is bonded in a distorted bent 120 degrees geometry to two equivalent K1+ and two equivalent As3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Geogenic, Anthropogenic, and Authigenic Minerals Hosting Arsenic and Antimony in Yellowknife Bay Sediments

Abstract Yellowknife Bay (Great Slave Lake, Northwest Territories, Canada) is a water body valued by surrounding communities for its subsistence, recreational, and cultural use. Located directly downstream of the former Giant Mine and Con Mine, Yellowknife Bay has received inputs from mine waste streams enriched in arsenic (As), antimony (Sb), and metals since the late 1930s. Lake sediments in Yellowknife Bay provide a record of metal(loid) contamination from aerially deposited roaster stack emissions, mine effluent, and Giant Mine tailings. A sediment sampling program was conducted in Yellowknife Bay to characterize As and Sb mineralogy using scanning electron microscopy-mineral liberation analysis. Mineralogical analysis of As- and Sb-hosted minerals in nine sediment cores suggests that arsenic trioxide (As2O3), originally deposited during the period of peak-mining emissions, has since been transformed into authigenic sulfides (interpreted to be realgar) down core from peak-mining emissions. Arsenic has also been attenuated by iron (Fe)-oxyhydroxides and roaster-generated iron oxides up-core from peak-mining emissions, near the sediment–water interface. The Sb-bearing minerals appear to be stable in Yellowknife Bay sediments, with no conclusive evidence of post-depositional mobility having been identified. The observed prevalence of arsenic trioxide in surface sediments proximal to Giant Mine suggests that As and Sb contamination is ongoing, likely from terrestrial weathering of contaminated soils and shoreline outcrops. Arsenic-bearing oxide minerals prevalent in surface sediments may become unstable should redox conditions in the hypolimnion change; prolonged anoxia could destabilize the As hosting minerals and release As to bottom waters. Therefore, long-term monitoring of the water column, including hypolimnion conditions, in Yellowknife Bay is recommended.

Mineralogy↗