Disentangling anharmonic from disorder dominated thermal transport in Yttria stabilized cubic Zirconia
Yttria stabilized cubic zirconia (YSZ) is a ceramic of high technological interest, due to its ultra-low lattice thermal conductivity, large high temperature ion conductivity and thermal stability. We focus here on the measurement of the acoustic phonons lifetime. We first investigated at room temperature the energy dependence of the phonon lifetime and evidenced a crossover at q~0.25 rlu between a w^4 dependence at low-q (measured on 4f1@LLB), as expected in a disorder-dominated dynamics, and the w^2 dependence assumed to come from Umklapp scattering at higher q (measured on 1T@LLB). Surprisingly, we also observed a strong temperature dependence of the acoustic phonon lifetime in the w^4 regime, at odds with the observed glass-like temperature independence of the thermal conductivity. Thus, in the continuity of our work, we propose here to thoroughly investigate the temperature dependence of the lifetimes of phonons on both sides of the crossover over a wide temperature range [10 K:570 K]. We thus ask for 7 days on IN8. This work is part of the PhD thesis of S. Turner, focused on the phonon lifetime measurement for a microscopic understanding of thermal transport.
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Shelby R. Turner; BOURDAROT Frederic; DE BOISSIEU Marc; GIORDANO Valentina; IVANOV Alexandre; PAILHES Stephane; PIOVANO Andrea; RAYMOND Stephane and SCHOBER Helmut. (2019). Disentangling anharmonic from disorder dominated thermal transport in Yttria stabilized cubic Zirconia. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-492
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