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Materials Data on LaAgSb2 by Materials Project

LaAgSb2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. La3+ is bonded in a 8-coordinate geometry to eight Sb2- atoms. There are four shorter (3.29 Å) and four longer (3.44 Å) La–Sb bond lengths. Ag1+ is bonded in a 4-coordinate geometry to four equivalent Ag1+ and four equivalent Sb2- atoms. All Ag–Ag bond lengths are 3.14 Å. All Ag–Sb bond lengths are 2.91 Å. There are two inequivalent Sb2- sites. In the first Sb2- site, Sb2- is bonded in a 8-coordinate geometry to four equivalent La3+ and four equivalent Ag1+ atoms. In the second Sb2- site, Sb2- is bonded in a 8-coordinate geometry to four equivalent La3+ and four equivalent Sb2- atoms. All Sb–Sb bond lengths are 3.14 Å.

36 MATERIALS SCIENCE↗

Effects of Physical and Chemical Pressure on Charge Density Wave Transitions in LaAg1−xAuxSb2 Single Crystals

The structural characterization and electrical transport measurements at ambient and applied pressures of the compounds of the LaAg1−xAuxSb2 family are presented. Up to two charge density wave (CDW) transitions could be detected upon cooling from room temperature and an equivalence of the effects of chemical and physical pressure on the CDW ordering temperatures was observed with the unit cell volume being a salient structural parameter. As such LaAg1−xAuxSb2 is a rare example of a non-cubic system that exhibits good agreement between the effects of applied, physical, pressure and changes in unit cell volume from steric changes induced by isovalent substitution. Additionally, for LaAg0.54Au0.46Sb2 anomalies in low temperature electrical transport were observed in the pressure range where the lower charge density wave is completely suppressed.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗