Anomalous thermal expansion in the square-net compounds RE4TGe8 (RE = Yb, Gd; T = Cr-Ni, Ag) |
| |
Authors: | Peter Sebastian C Chondroudi Maria Malliakas Christos D Balasubramanian Mahalingam Kanatzidis Mercouri G |
| |
Institution: | Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States. |
| |
Abstract: | The family of materials RE(4)TGe(8) (RE = Yb, Gd; T = transition metal) exhibits directional zero thermal expansion (ZTE) via a process that is associated with the linking of planar square nets in the third dimension. The Ge square nets in these compounds exhibit commensurate long-range modulations similar to those observed in charge-density-wave compounds. The ZTE is manifested in the plane of the square nets from 10 to 300 K with negligible volume expansion below ~160 K. The specific atomic arrangement in RE(4)TGe(8) enables a Poisson-like mechanism that allows the structure to contract along one direction as it expands only slightly in the perpendicular direction. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|