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arXiv 1807.00237cond-mat.mtrl-sci
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理论上的specific heat,以及通过详细的声子振动估计的热导率

Theoretical specific heat, and thermal conductivity estimated by detailed phonon vibrations

Hirofumi Kakemoto

摘要:

本文报道了用Einstein模型和Debye模型计算岩盐(NaCl)、Na $_x$、Co O $_2$、SrTiO $_3$和LiNbO $_3$的比热($c_v$)和热导率($κ$)的结果。在计算中,由上述材料中声子的色散(~ $ω$/$K$)估算了纵向(L)和横向(T)声速($v_T$,$v_L$),并将平均声速($v_a$)输入德拜模型中求解$κ$方程,并与Einstein模型的结果进行了比较。在某些氧化物中,$v_a$在略高的$v_T$($v_T$ / $v_L$ =0.3-0.5)下相对还原。将$κ$、$v_a$和$T$的关系描绘为关于实现低$κ$值以应用热电性能的等高线图。

英文摘要:

We report the calculation results of specific heat ($c_v$), and thermal conductivity ($κ$) by using Einstein, and Debye models about rock salt (NaCl), oxides: Na$_x$CoO$_2$, SrTiO$_3$, and LiNbO$_3$. In calculation, the longitudinal (L), and transverse (T) sound velocities ($v_T$, $v_L$) were estimated from acoustic phonons' dispersion's (~$ω$/$K$) in above materials, and the average sound velocities ($v_a$) were input into Debye model for $κ$ equation, and results were compared with that of Einstein model. In some oxides, $v_a$ is relatively reduced at slight high $v_T$ ($v_T$/$v_L$=0.3-0.5). The relation of $κ$, $v_a$ and $T$ were imaged as the contour plots about realizing low $κ$ values to be application of thermoelectric properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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