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Bönnighausen, Judith
in Cooperation with on an Cooperation-Score of 37%
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article
Squares of gold atoms and linear infinite chains of Cd atoms as building units in the intermetallic phases REAu4Cd2 (RE=La–Nd, Sm) with YbAl4Mo2-type structure
Abstract
<jats:title>Abstract</jats:title><jats:p>The gold-rich intermetallic compounds <jats:italic>RE</jats:italic>Au<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub> (<jats:italic>RE</jats:italic> = La–Nd, Sm) were synthesized from the elements in sealed tantalum ampoules. Their characterization by X-ray powder and single crystal data confirmed the tetragonal YbAl<jats:sub>4</jats:sub>Mo<jats:sub>2</jats:sub> type, space group <jats:italic>I</jats:italic>4/<jats:italic>mmm</jats:italic>. The basic building units are Au<jats:sub>4</jats:sub> squares (278 pm Au–Au in CeAu<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub>) and infinite linear cadmium chains (275 pm Cd–Cd in CeAu<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub>). We exemplarily studied the solid solution CeAu<jats:sub>4+</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Cd<jats:sub>2−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic> for <jats:italic>x</jats:italic> = 0–1 up to CeAu<jats:sub>5</jats:sub>Cd. Electron diffraction patterns on a CeAu<jats:sub>5</jats:sub>Cd sample confirm the single crystal data. They give no hint for complete gold-cadmium ordering. Temperature-dependent magnetic susceptibility measurements of CeAu<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub>, CeAu<jats:sub>5</jats:sub>Cd, PrAu<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub> and NdAu<jats:sub>4</jats:sub>Cd<jats:sub>2</jats:sub> show stable trivalent rare earth ions and give no hint for magnetic ordering above 3 K.</jats:p>