3 research outputs found
Ultralow Lattice Thermal Transport and Considerable Wave-like Phonon Tunneling in Chalcogenide Perovskite BaZrS<sub>3</sub>
Chalcogenide perovskites provide a promising avenue for
nontoxic,
stable thermoelectric materials. Here, the thermal transport and thermoelectric
properties of BaZrS3 as a typical orthorhombic perovskite
are investigated. An extremely low lattice thermal conductivity κL of 1.84 W/mK at 300 K is revealed for BaZrS3,
due to the softening effect of Ba atoms on the lattice and the strong
anharmonicity caused by the twisted structure. We demonstrate that
coherence contributions to κL, arising from wave-like
phonon tunneling, lead to an 18% thermal transport contribution at
300 K. The increasing temperature softens the phonons, thus reducing
the group velocity of materials and increasing the scattering phase
space. However, it simultaneously reduces the anharmonicity, which
is dominant in BaZrS3 and ultimately improves the particle-like
thermal transport. In addition, via replacement of the S atom with
Se- and Ti-alloying strategy, the ZT value of BaZrS3 is significantly increased from 0.58 to 0.91 at 500 K, making
it an important candidate for thermoelectric applications
Ultralow Lattice Thermal Transport and Considerable Wave-like Phonon Tunneling in Chalcogenide Perovskite BaZrS<sub>3</sub>
Chalcogenide perovskites provide a promising avenue for
nontoxic,
stable thermoelectric materials. Here, the thermal transport and thermoelectric
properties of BaZrS3 as a typical orthorhombic perovskite
are investigated. An extremely low lattice thermal conductivity κL of 1.84 W/mK at 300 K is revealed for BaZrS3,
due to the softening effect of Ba atoms on the lattice and the strong
anharmonicity caused by the twisted structure. We demonstrate that
coherence contributions to κL, arising from wave-like
phonon tunneling, lead to an 18% thermal transport contribution at
300 K. The increasing temperature softens the phonons, thus reducing
the group velocity of materials and increasing the scattering phase
space. However, it simultaneously reduces the anharmonicity, which
is dominant in BaZrS3 and ultimately improves the particle-like
thermal transport. In addition, via replacement of the S atom with
Se- and Ti-alloying strategy, the ZT value of BaZrS3 is significantly increased from 0.58 to 0.91 at 500 K, making
it an important candidate for thermoelectric applications
Characteristics of <i>S. enterica</i> Typhimurium isolates producing ESBLs.
<p>CTX: cefotaxime; CAZ: ceftazidime; SXT: trimethoprim/sulfamethoxazole; TE: tetracycline; SAM: ampicillin plus sulbactam; AMP: ampicillin; CEC: cefaclor; TOB: tobramycin; CN: gentamicin; AMK: amikacin; TZP: piperacillin plus tazobactam; C: chloramphenicol.</p