High-pressure neutron diffraction study of Pd 3 Fe

• Published in: Journal of applied physics 2019-01, Vol.125 (1)
• Main Authors: Ridley, Christopher J., Bull, Craig L., Funnell, Nicholas P., Capelli, Silvia C., Manuel, Pascal, Khalyavin, Dmitry D., O’Neill, Christopher D., Kamenev, Konstantin V.
• Format: Article
• Language: English
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.5079804

High-pressure neutron diffraction data from powder and single-crystal samples of atomically disordered ( F m 3 ¯ m ) and ordered ( P m 3 ¯ m ) Pd 3 Fe were collected up to pressures of 15 GPa, and high-pressure SQUID magnetometry data were collected up to 6 GPa. The data show a subtle decrease in the magnetic moment with applied pressure, resulting in a transition to a paramagnetic state by approximately 8 GPa at 300 K. Diffraction results have been used to determine the equation of state, resulting in a bulk modulus of 176.78(9) GPa for the disordered powder and 187.96(7) GPa for the ordered single-crystal samples, approximately 20% more compressible than previously reported from X-ray measurements. High-temperature superconducting quantum interference device magnetometry was used to confirm the ambient pressure Curie temperature of the sample (545 K), which was further investigated using high-temperature single-crystal neutron diffraction at ambient pressure.