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Title: Elastic anomalies across phase transitions of praseodymium to 12 GPa

Abstract

The elastic properties of praseodymium (Pr) were investigated at pressures up to 12 GPa at room temperature using ultrasonic interferometry technique. Softening and discontinuities in compressional (P) and shear (S) wave velocities were observed at around 2.5, 6.5 and 10.5 GPa, which are interpreted as indications of the phase transitions from Pr-I (dhcp) to Pr-II (fcc), Pr-II (fcc) to Pr-III (d-fcc) and Pr-III (d-fcc) to Pr-VII (monoclinic or orthorhombic), respectively. Very small discontinuities in compressibility have been observed across the phase transitions of I-II and II-III of Pr, which are unlikely visible in the X-ray diffraction studies. Finally, a comparison with the elastic behaviors of other lanthanide elements (e.g., Ce and La) suggests that the elastic anomalies associated with these phase transitions are likely to be caused by the 6s-5d electron transfer and the softening of acoustic phonon mode facilitated by decreased atomic distances under pressure.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2];  [3]
  1. Stony Brook Univ., NY (United States). Mineral Physics Inst.
  2. Stony Brook Univ., NY (United States). Dept. of Geosciences
  3. Stony Brook Univ., NY (United States). Mineral Physics Inst.; Stony Brook Univ., NY (United States). Dept. of Geosciences
Publication Date:
Research Org.:
State Univ. of New York (SUNY), Stony Brook, NY (United States); Stony Brook Univ., NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1529597
Alternate Identifier(s):
OSTI ID: 1529599; OSTI ID: 1638373
Grant/Contract Number:  
NA0002907; NA0003886
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 18; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; elasticity; equation of state; lanthanide; sound velocity; phase transition; acoustic velocity; high pressure

Citation Formats

Cai, Nao, Chen, Ting, Qi, Xintong, and Li, Baosheng. Elastic anomalies across phase transitions of praseodymium to 12 GPa. United States: N. p., 2018. Web. doi:10.1063/1.5046311.
Cai, Nao, Chen, Ting, Qi, Xintong, & Li, Baosheng. Elastic anomalies across phase transitions of praseodymium to 12 GPa. United States. doi:10.1063/1.5046311.
Cai, Nao, Chen, Ting, Qi, Xintong, and Li, Baosheng. Wed . "Elastic anomalies across phase transitions of praseodymium to 12 GPa". United States. doi:10.1063/1.5046311. https://www.osti.gov/servlets/purl/1529597.
@article{osti_1529597,
title = {Elastic anomalies across phase transitions of praseodymium to 12 GPa},
author = {Cai, Nao and Chen, Ting and Qi, Xintong and Li, Baosheng},
abstractNote = {The elastic properties of praseodymium (Pr) were investigated at pressures up to 12 GPa at room temperature using ultrasonic interferometry technique. Softening and discontinuities in compressional (P) and shear (S) wave velocities were observed at around 2.5, 6.5 and 10.5 GPa, which are interpreted as indications of the phase transitions from Pr-I (dhcp) to Pr-II (fcc), Pr-II (fcc) to Pr-III (d-fcc) and Pr-III (d-fcc) to Pr-VII (monoclinic or orthorhombic), respectively. Very small discontinuities in compressibility have been observed across the phase transitions of I-II and II-III of Pr, which are unlikely visible in the X-ray diffraction studies. Finally, a comparison with the elastic behaviors of other lanthanide elements (e.g., Ce and La) suggests that the elastic anomalies associated with these phase transitions are likely to be caused by the 6s-5d electron transfer and the softening of acoustic phonon mode facilitated by decreased atomic distances under pressure.},
doi = {10.1063/1.5046311},
journal = {Journal of Applied Physics},
number = 18,
volume = 124,
place = {United States},
year = {2018},
month = {11}
}

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