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Investigation of thermal diffusivity dependence on temperature in a group of optical single crystals doped with rare earth ions

机译：掺杂稀土离子的光学单晶中热扩散系数与温度的关系研究

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The group of YAG, YVO4 and GdCOB single crystals was examined to determine the thermal diffusivity as a function of temperature in range from 30 degrees C to 300 degrees C. Further investigations concerned on analysis of the influence of dopants on these dependencies. The experimental setup based on thermal wave method with mirage detection was used. The samples represented different crystallographic systems such as cubic (YAG) tetragonal (YVO4) and monoclinic (GdCOB). The anisotropy of thermal conductivity of investigated samples was taken into account in the investigations. The crystals were doped with calcium ions, rare earth ions such as ytterbium, neodymium, and thulium, and also with transition metal vanadium. The results confirmed that influence of doping on the thermal diffusivity of investigated materials strongly depends on temperature. In general the thermal diffusivity decreases with increasing of sample temperature from 30 degrees C to 300 degrees C, however the drop in thermal diffusivity is the highest for Pure single crystals. Doping is another factor reducing the heat transport in single crystals. Introduction of dopant ions into a crystal lattice leads to a significant decrease in the thermal diffusivity at lower temperatures in comparison with pure crystals. However, the influence of dopants becomes less pronounced with increasing temperature, and in case of weakly doped crystals it becomes negligible at higher temperatures. The interpretation of thermal diffusivity dependence on temperature for single crystals was based on the Debye model of lattice thermal conductivity of solids. The results allowed to conclude that the decrease of thermal diffusivity with temperature and increasing concentration of impurities is caused by shortening of the phonons mean free path due to phonon-phonon and phonon-point defect scatterings. (C) 2015 Elsevier B.V. All rights reserved.
机译：检验了YAG，YVO4和GdCOB单晶组，确定了温度在30摄氏度至300摄氏度范围内随温度变化的热扩散系数。进一步的研究涉及分析掺杂剂对这些依赖性的影响。使用基于热波方法的海市rage楼检测的实验装置。样品代表不同的晶体学系统，例如立方（YAG）四方晶（YVO4）和单斜晶（GdCOB）。在研究中考虑了被测样品的导热系数的各向异性。晶体中掺有钙离子，稀土离子（如，钕和ul）以及过渡金属钒。结果证实，掺杂对所研究材料的热扩散率的影响很大程度上取决于温度。通常，热扩散率会随着样品温度从30摄氏度增加到300摄氏度而降低，但是对于纯单晶，热扩散率的下降最高。掺杂是减少单晶中热传递的另一个因素。与纯晶体相比，将掺杂剂离子引入晶格会导致在较低温度下热扩散率显着降低。然而，随着温度的升高，掺杂剂的影响变得不那么明显，并且在弱掺杂的晶体的情况下，在更高的温度下它可以忽略不计。单晶的热扩散率对温度的依赖性的解释是基于固体的晶格热导率的德拜模型。该结果可以得出结论，热扩散系数随温度的降低和杂质浓度的增加是由于声子-声子和声子点缺陷散射引起的声子平均自由程缩短而引起的。 （C）2015 Elsevier B.V.保留所有权利。

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