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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sn4As3 by Materials Project

Sn4As3 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Sn4As3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Sn+2.25+ sites. In the first Sn+2.25+ site, Sn+2.25+ is bonded in a distorted T-shaped geometry to three equivalent As3- atoms. All Sn–As bond lengths are 2.79 Å. In the second Sn+2.25+ site, Sn+2.25+ is bonded to six As3- atoms to form a mixture of edge and corner-sharing SnAs6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (2.89 Å) and three longer (3.08 Å) Sn–As bond lengths. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to six Sn+2.25+ atoms to form a mixture of edge and corner-sharing AsSn6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second As3- site, As3- is bonded to six equivalent Sn+2.25+ atoms to form a mixture of edge and corner-sharing AsSn6 octahedra. The corner-sharing octahedral tilt angles are 5°.

36 MATERIALS SCIENCE↗
DOE OSTI2026

Causes of Degradation of Organ Pipes with Very Low Lead Content

This study investigates the causes of degradation in organ pipes with low lead content. Using light This study investigates the causes of degradation in organ pipes with low lead content. Using light optical microscopy, SEM/EDS, and TEM/EDS, intermetallic Cu6Sn5, FeSn2, Sn4As3, and Pb particles were observed in the structure of SnPb alloys. Degradation of the low-Pb organ metal, which is primarily caused by the selective corrosion of lead occurring due to the effect of volatile organic compounds (VOCs). Another factor leading to degradation is the structural transformation of tin occurring at low temperatures (tin pest). TEM/EDS allowed the unique observation of α-tin particles found in a β-tin matrix at room temperature. The presence of particles of α‑tin in historical organ pipes has not previously been reported, and it is the first presented observation of all.

alloy SnPb↗