High-temperature and high-pressure X-ray diffraction experiments were conducted on the perovskite NdCrO3. High-temperature measurements were used to investigate the temperature dependence of the crystal structure up to 823 K. The magnitude of the octahedral tilting distortion decreased with an increase in temperature. The pressure dependence of the lattice parameters up to 6.4(2) GPa were determined using a diamond anvil cell and monochromatic synchrotron X-ray diffraction. The a lattice parameters exhibit an unusual elongation with pressure, but there was no indication of a pressure-induced phase transition in the pressure range examined and a least squares fit to the volume-pressure data with a second-order Birch-Murnagahan equation of state yielded a large bulk modulus of 338(20) GPa, making it one of the least compressible perovskite oxides.
Bibliographical noteFunding Information:
Financial support from the Department of Energy through grant DE-FG02-04ER46122 and the National Science Foundation through grant DMR:0450103 is gratefully acknowledged. Work at Brookhaven is supported by the U.S. Department of Energy, Division of Materials Sciences, under Contract DE-AC02-98CH10886.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry