High-pressure Raman and x-ray diffraction studies on ${\text{LaB}}_{6}$

High-pressure Raman and x-ray diffraction studies on ${LaB}_{6}$

B. K. Godwal, E. A. Petruska, S. Speziale, J. Yan, S. M. Clark, M. B. Kruger, and R. Jeanloz

Phys. Rev. B 80, 172104 – Published 19 November 2009

Abstract

X-ray diffraction measurements and Raman spectroscopy at room temperature document the equation of state and the frequency shifts for $E_{g}$ , $T_{2 g}$ , and $A_{1 g}$ vibrational modes of polycrystalline ${LaB}_{6}$ under pressure. The data exhibit smooth pressure dependencies, yielding a zero-pressure isothermal bulk modulus $K_{0 T} = 164 (\pm 2) GPa$ in good accord with independent ultrasonic measurements, and show no evidence of structural or electronic phase transitions up to at least 25 GPa.

Received 9 March 2009

DOI:https://doi.org/10.1103/PhysRevB.80.172104

Authors & Affiliations

B. K. Godwal¹, E. A. Petruska², S. Speziale³, J. Yan⁴, S. M. Clark^1,4, M. B. Kruger², and R. Jeanloz^1,5

¹Department of Earth & Planetary Sciences, University of California, Berkeley, California 94720, USA
²Department of Physics, University of Missouri, Kansas City, Missouri 64110, USA
³Deutsches GeoForschungsZentrum (GFZ), Telegrafenberg, 14473 Potsdam, GermanyLawrence Berkeley National
⁴Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
⁵Department of Astronomy, University of California, Berkeley, California 94720, USA

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Vol. 80, Iss. 17 — 1 November 2009

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Physical Review B

covering condensed matter and materials physics

High-pressure Raman and x-ray diffraction studies on ${LaB}_{6}$

B. K. Godwal, E. A. Petruska, S. Speziale, J. Yan, S. M. Clark, M. B. Kruger, and R. Jeanloz

Phys. Rev. B 80, 172104 – Published 19 November 2009

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review B

covering condensed matter and materials physics

High-pressure Raman and x-ray diffraction studies on LaB6

B. K. Godwal, E. A. Petruska, S. Speziale, J. Yan, S. M. Clark, M. B. Kruger, and R. Jeanloz

Phys. Rev. B 80, 172104 – Published 19 November 2009

Abstract

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High-pressure Raman and x-ray diffraction studies on ${LaB}_{6}$