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Lattice Vibrations and Thermal Properties of Stoichiometric KYb(WO4)(2) Crystal

机译:化学计量比的KYb(WO4)(2)晶体的晶格振动和热学性质

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Single crystal KYb(WO4)(2) (KYbW) has been grown by the top-seeded solution growth (TSSG) method. Polarized Raman and infrared spectra have been recorded at room temperature. The lattice vibration modes were calculated, and the strongest peaks appear at 760 and 908 cm(-1) with a line-width Delta omega(R) of 14.2 and 10 cm(-1), corresponding to relaxation times of 0.747 and 1.061 ps, respectively. This makes KYbW attractive for stimulated Raman scattering (SRS) applications and for use in the picosecond regime. Differential thermal analysis and thermal gravimetric analysis curves, high-temperature X-ray diffraction patterns, specific heat, thermal expansion and thermal conductivity have been studied. The thermal expansion anisotropy of KYbW is weaker than that of KGd(WO4)(2) (KGW), but stronger than that of KLu(WO4)(2) (KLuW). The thermal diffusivity along the c-axis is large (lambda(c) > lambda(a) > lambda(b)). The results are consistent with the anisotropic structure of crystalline KYbW.
机译:单晶KYb(WO4)(2)(KYbW)已通过顶晶溶液生长(TSSG)方法生长。在室温下已记录了偏振拉曼光谱和红外光谱。计算出晶格振动模式,最强峰出现在760和908 cm(-1)处,线宽Delta omega(R)为14.2和10 cm(-1),对应于0.747和1.061 ps的弛豫时间, 分别。这使得KYbW对受激拉曼散射(SRS)应用以及皮秒范围的应用具有吸引力。研究了差热分析和热重分析曲线,高温X射线衍射图,比热,热膨胀和热导率。 KYbW的热膨胀各向异性比KGd(WO4)(2)(KGW)弱,但比KLu(WO4)(2)(KLuW)强。沿c轴的热扩散率很大(lambda(c)> lambda(a)> lambda(b))。结果与晶体KYbW的各向异性结构一致。

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