A theory of the critical behavior of a dilute ionic solution is constructed. An expression for the susceptibility in a wide temperature range is obtained. It is shown that ionic solutions belong to the universality class of the Ising model. The Ginzburg parameter of the ionic solutions decreases with the increase of the solvent concentration. In the general case, the critical exponent of susceptibility nonmonotonically depends on the temperature in the crossover region from the Ising-like to the mean-field behavior. In the vicinity of the transition point, the Debye-Huckel screening radius is proportional to the correlation length. As T → T_c, the screening radius tends to infinity and the screening disappears. The voltage between the two phases of the ionic solution is proportional to the order parameter and changes as |T/T_c - 1|~β in the vicinity of the phase transition point.
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机译：构造了稀离子溶液的临界行为的理论。得到在宽温度范围内的磁化率的表达式。结果表明，离子溶液属于伊辛模型的通用类。离子溶液的Ginzburg参数随着溶剂浓度的增加而降低。在一般情况下，磁化率的临界指数非单调地取决于从类似伊辛到平均场行为的交叉区域中的温度。在过渡点附近，Debye-Huckel筛选半径与相关长度成比例。当T→T_c时，屏蔽半径趋于无穷大，屏蔽消失。离子溶液的两相之间的电压与有序参数成正比，并且在相变点附近以| T / T_c-1 |〜β的形式变化。
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