矿对酸矿的电导率的影响
Science (New York, N.Y.)
|October 30, 1998
概括
将添加到酸矿中显著增加了其电导率,这可能是由于极子导电. 这一发现与地球深层内部的地球物理模型一致.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
- 材料科学 材料科学 材料科学
背景情况:
- 酸矿是地球下层地幔的主要组成部分.
- 了解其电导率对于解释地震数据和建模地幔动态至关重要.
- 和铁等小元素在影响矿性质中的作用尚未完全理解.
研究的目的:
- 为了研究对酸矿电导率的影响.
- 为了在高压和高温下确定酸中导电机制.
- 评估这些发现对下层地幔的地球物理模型的影响.
主要方法:
- 在25 GPa和14001600°C时测量 (Mg,Fe) SiO3矿的电导率.
- 莫斯尔光谱分析铁价值状态 (Fe2+与Fe3+) 在矿样本中.
- 含和不含的矿样品的比较.
主要成果:
- 含 (Mg,Fe) SiO3 矿的电导率大约是无矿的3.5倍.
- 莫斯巴乌尔的研究表明,含样本中的Fe3+含量增加了3.5倍,这表明极子导电.
- 从含的矿数据中得出的导电性-深度概况与现有的地球物理模型相一致.
结论:
- 的加入显著提高了酸的电导率.
- 极管导电,在的存在下增加Fe3+的促进,是可能的机制.
- 这些结果支持在下层地幔的地球物理模型中使用含的矿导电性.
相关概念视频
02:54Trends in Lattice Energy: Ion Size and Charge
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
01:19Ionic Strength: Effects on Chemical Equilibria
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary cation—the calcium...
In this solution, the primary cation—the calcium...