Abstract Tetragonal, scheelite-type Pb1–3x□xGd2x(MoO4)1–3x(WO4)3x materials (x = 0.0455, 0.0839, 0.1154, 0.1430, 0.1667 and 0.1774, where □ denotes vacancies) synthesized via solid state reaction route were magnetically and electrically examined. The ac and dc magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with characteristic superparamagnetic-like behaviour and a spin-only contribution to the paramagnetic moment. Broadband dielectric spectroscopy studies exhibited existence in the loss spectra the faster and slower relaxation processes with various time scales for the gadolinium-poorer samples with the x vacancy parameter up to 0.1154. For samples with higher Gd content, i.e. when x > 0.1154, no signs of any relaxation processes was observed. This phenomenon has been explained by a smaller number of structural and spin defects as opposed to the samples poorer in gadolinium ions.

中文翻译：

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超顺磁性掺钆钼钨酸铅的电弛豫

摘要 四方白钨型 Pb1-3x□xGd2x(MoO4)1-3x(WO4)3x 材料（x = 0.0455, 0.0839, 0.1154, 0.1430, 0.1667 and 0.1774, 其中路线 □ 表示通过磁空位反应合成）和电气检查。交流和直流磁测量以及布里渊拟合程序显示具有特征超顺磁行为的顺磁状态和对顺磁矩的仅自旋贡献。宽带介电光谱研究表明，对于 x 空位参数高达 0.1154 的钆含量较低的样品，损耗光谱中存在具有不同时间尺度的更快和更慢的弛豫过程。对于 Gd 含量较高的样品，即当 x > 0.1154 时，没有观察到任何弛豫过程的迹象。