Electrical properties of mixtures of composite materials are sensitive to texture between grains. Electrical measurements of hematite and sandstone composite mixture were performed in the frequency range (5 × 10⁻⁴ Hz–10⁵ Hz). This study is a trial to give more detailed information upon the effect of electrical properties and their relation to the ore composite mixture, its geochemical and spectrographic analyses. The composite mixture of the samples displays some similarity in the frequency-dependent response of the electrical properties that follow Jonscher’s universal law. The frequency dependence of electrical conductivity indicates that the sample behaves as a semiconductor material at relatively high frequencies. The spectra of the measured electrical properties vary strongly with the change of the concentration of the conductive elements and the texture of the specimens. The main change of the electrical properties is related to the conductor (saturation) concentration. This change does not increase monotonically with the increase in the conductor (saturation) concentration which may be attributed to the degree of heterogeneity between the grains (and texture). The interface between the grains controls the relatively low frequencies, whereas the bulk grain dominates the relatively high frequencies. The heterogeneity of the samples is an effective component in controlling the electrical properties of the composite mixtures.

中文翻译：

---

杂化砂岩样品的非均质性与电学和矿物学性质的关系

复合材料混合物的电性能对晶粒之间的织构敏感。在频率范围（5×10 ^-4 Hz–10 ⁵赫兹）。这项研究是一项试验，目的是就电性能的影响及其与矿石复合混合物的关系，其地球化学和光谱分析提供更详细的信息。样品的复合混合物在遵循Jonscher通用定律的电特性的频率相关响应中显示出一些相似性。电导率的频率依赖性表明样品在相对较高的频率下表现为半导体材料。所测量的电性能的光谱随导电元素浓度和样品质地的变化而变化很大。电性能的主要变化与导体（饱和）浓度有关。这种变化不会随导体（饱和度）浓度的增加而单调增加，这可能归因于晶粒（和纹理）之间的不均匀程度。晶粒之间的界面控制着相对较低的频率，而块状晶粒则主导着相对较高的频率。样品的异质性是控制复合混合物电性能的有效成分。