Abstract Low-frequency spectra are investigated in a series of strontium barium niobate crystals SrxBa1-xNb2O6 with chemical compositions x = 0.33, 0.5, 0.61, and 0.75 in a back-scattering (ZZ) geometry and a wide temperature range including ferroelectric and paraelectric phases. It is shown that for all crystals studied, a central peak (CP) is clearly manifested in the vicinity of phase transition temperature. The temperature dependences of the CP parameters were obtained in all investigated crystals. It is shown that the central peak in all crystals studied is described by a number of relaxation times, which is typical for relaxors.

中文翻译：

---

不同化学成分SrxBa1-xNb2O6晶体在太赫兹范围内有序参数波动的光学研究

摘要 研究了一系列具有化学成分 x = 0.33、0.5、0.61 和 0.75 的铌酸锶钡晶体 SrxBa1-xNb2O6 的低频光谱，具有反向散射 (ZZ) 几何形状和宽温度范围，包括铁电相和顺电相. 结果表明，对于所有研究的晶体，在相变温度附近清楚地显示出中心峰（CP）。在所有研究的晶体中都获得了 CP 参数的温度依赖性。结果表明，所有研究的晶体中的中心峰都由许多弛豫时间描述，这对于弛豫是典型的。