论文标题
srbi $ _4 $ ti $ _4 $ o $ o $ _ {15} $ - la $ _ $ _ {0.7} $ sr $ _ {0.3} $ mno $ _3 $氧化物复合材料：粒度和接口热电阻的作用
Effective Thermal Conductivity of SrBi$_4$Ti$_4$O$_{15}$-La$_{0.7}$Sr$_{0.3}$MnO$_3$ Oxide composite: Role of Particle Size and Interface Thermal Resistance
论文作者
论文摘要
我们提出了一种新的方法，可以使用声阻抗不匹配和Debye模型来降低热电复合材料的热电材料（$κ$）。同样，讨论了界面热电阻（r $ _ {int} $）与复合k上分散相的粒径之间的相关性。特别是，由天然超级晶格Aurivillius阶段（srbi $ _4 $ ti $ _4 $ _4 $ o $ _ {15} $）组成的氧化物复合材料的$κ$作为矩阵和perovskite（la $ $ _ {0.7} A significant reduction in the $κ$ of composite, even lower than the $κ$ of the matrix when the particle size of La$_{0.7}$Sr$_{0.3}$MnO$_3$ is smaller than the Kapitza radius (a$_K$) is observed, depicting that R$_{int}$ dominates for particle size lower than a$_K$ due to increased surface to体积比。所获得的结果有可能为具有所需的导热性和有望在能量收集领域具有希望的工程复合热电系统提供新的方向。
We present a novel approach to reduce the thermal conductivity ($κ$) in thermoelectric composite materials using acoustic impedance mismatch and the Debye model. Also, the correlation between interface thermal resistance (R$_{int}$) and the particle size of the dispersed phase on the k of the composite is discussed. In particular, the $κ$ of an oxide composite which consists of a natural superlattice Aurivillius phase (SrBi$_4$Ti$_4$O$_{15}$) as a matrix and perovskite (La$_{0.7}$Sr$_{0.3}$MnO$_3$) as a dispersed phase is investigated. A significant reduction in the $κ$ of composite, even lower than the $κ$ of the matrix when the particle size of La$_{0.7}$Sr$_{0.3}$MnO$_3$ is smaller than the Kapitza radius (a$_K$) is observed, depicting that R$_{int}$ dominates for particle size lower than a$_K$ due to increased surface to volume ratio. The obtained results have the potential to provide new directions for engineering composite thermoelectric systems with desired thermal conductivity and promising in the field of energy harvesting.
