The 50 K anomaly in the shear modulus of β-PdH0.71

Douglas Joseph Safarik; R. B. Schwarz

The 50 K anomaly in the shear modulus of β-PdH_0.71

Douglas Joseph Safarik
, R. B. Schwarz

Los Alamos National Laboratory

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We used acoustic techniques to measure the two independent shear moduli of β-phase PdH_0.71 in the range 1.4 K < T < 300K. The temperature dependence of C= (C₁₁ - C₁₂)/2 shows a small peak at ∼55 K, and a sigmoid-shaped decrease near 170 K. We associate the peak with the well-known "50 K anomaly", which is observed in other physical properties of β-phase PdH_x and PdD_x. We propose that the 50 K anomaly is a purely kinetic effect arising from the freezing of the hydrogen short-range order as the hydride is cooled.

Original language	English
Title of host publication	TMS2008 - 137th Annual Meeting and Exhibition Supplemental Proceedings
Subtitle of host publication	Materials Processing and Properties
Pages	601-607
Number of pages	7
State	Published - Oct 20 2008
Event	TMS 2008 Annual Meeting Supplemental: Materials Processing and Properties - Duration: Oct 20 2008 → …

Publication series

Name	TMS Annual Meeting
Volume	1

Conference

Conference	TMS 2008 Annual Meeting Supplemental: Materials Processing and Properties
Period	10/20/08 → …

Cite this

@inproceedings{0ba242fb5b9c4b76b750d6171fe456bf,

title = "The 50 K anomaly in the shear modulus of β-PdH0.71",

abstract = "We used acoustic techniques to measure the two independent shear moduli of β-phase PdH0.71 in the range 1.4 K < T < 300K. The temperature dependence of C= (C11 - C12)/2 shows a small peak at ∼55 K, and a sigmoid-shaped decrease near 170 K. We associate the peak with the well-known {"}50 K anomaly{"}, which is observed in other physical properties of β-phase PdHx and PdDx. We propose that the 50 K anomaly is a purely kinetic effect arising from the freezing of the hydrogen short-range order as the hydride is cooled.",

author = "Safarik, \{Douglas Joseph\} and Schwarz, \{R. B.\}",

year = "2008",

month = oct,

day = "20",

language = "English",

isbn = "9780873397162",

series = "TMS Annual Meeting",

pages = "601--607",

booktitle = "TMS2008 - 137th Annual Meeting and Exhibition Supplemental Proceedings",

note = "TMS 2008 Annual Meeting Supplemental: Materials Processing and Properties ; Conference date: 20-10-2008",

}

TY - GEN

T1 - The 50 K anomaly in the shear modulus of β-PdH0.71

AU - Safarik, Douglas Joseph

AU - Schwarz, R. B.

PY - 2008/10/20

Y1 - 2008/10/20

N2 - We used acoustic techniques to measure the two independent shear moduli of β-phase PdH0.71 in the range 1.4 K < T < 300K. The temperature dependence of C= (C11 - C12)/2 shows a small peak at ∼55 K, and a sigmoid-shaped decrease near 170 K. We associate the peak with the well-known "50 K anomaly", which is observed in other physical properties of β-phase PdHx and PdDx. We propose that the 50 K anomaly is a purely kinetic effect arising from the freezing of the hydrogen short-range order as the hydride is cooled.

AB - We used acoustic techniques to measure the two independent shear moduli of β-phase PdH0.71 in the range 1.4 K < T < 300K. The temperature dependence of C= (C11 - C12)/2 shows a small peak at ∼55 K, and a sigmoid-shaped decrease near 170 K. We associate the peak with the well-known "50 K anomaly", which is observed in other physical properties of β-phase PdHx and PdDx. We propose that the 50 K anomaly is a purely kinetic effect arising from the freezing of the hydrogen short-range order as the hydride is cooled.

UR - https://www.scopus.com/pages/publications/53849101425

M3 - Conference contribution

SN - 9780873397162

T3 - TMS Annual Meeting

SP - 601

EP - 607

BT - TMS2008 - 137th Annual Meeting and Exhibition Supplemental Proceedings

T2 - TMS 2008 Annual Meeting Supplemental: Materials Processing and Properties

Y2 - 20 October 2008