A quantitative magnetic analytical method using Curie's law for mixture of paramagnetic and diamagnetic substances
A quantitative magnetic analytical method using Curie's law for mixture of paramagnetic and diamagnetic substances
复制标题
利用居里定律对顺磁和反磁物质混合物进行定量磁分析方法
DOI：
10.1088/0026-1394/49/4/530
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发表时间：
2012
期刊：
影响因子：
2.4
通讯作者：
加藤健次
中科院分区：
文献类型：
--
作者：
松本信洋;加藤健次
提出了利用居里定律进行定量磁分析测量的原理，作为一种新的有潜力的直接测量物质量的主要方法。混合样品中的目标主要分析物是一种具有自由量子自旋的物质——稀土离子或过渡金属离子。混合样品的基体是抗磁性的。分析物的自旋数可以由样品磁矩的温度依赖性得到。这种分析方法利用了郎之万顺磁性（符合居里定律）和抗磁性（表现出与温度无关的行为）对温度的依赖性的差异。为了对该分析方法进行初步验证，采用重量混合法制备了氧化硅中氧化钆的粉末混合物样品。所制备的混合样品的质量分数约为0.2 ~ 0.008。利用超导量子干涉装置磁强计测量了样品在340 K以下的磁矩值。通过磁矩的温度依赖性测定的氧化钆的每个分析浓度与重量浓度在大约10%的相对差异内是一致的。
The principle of quantitative magnetic analytical measurement using Curie's law is proposed as a future candidate for a new potential primary direct method of measurement for amount of substance. The targeted main analyte in a mixture sample is a species—a rare-earth ion or a transition-metal ion—that has a free quantum spin. The matrix of the mixture sample is diamagnetic. The spin number of the analyte can be obtained from the temperature dependence of the sample's magnetic moment. This analytical method uses differences in the temperature dependences of Langevin paramagnetism, which obeys Curie's law, and diamagnetism, which exhibits temperature-independent behaviour. For preliminary validation of this analytical method, powder mixture samples of gadolinium oxide in silicon oxide were prepared by a gravimetric blending method. The mass fractions of the prepared mixture samples were approximately 0.2 to 0.008. The values of the samples' magnetic moments at temperatures below 340 K were measured using a superconducting quantum interference device magnetometer. Each analytical concentration of gadolinium oxide determined by the temperature dependence of the magnetic moment was found to be consistent with the gravimetric concentration within a relative difference of approximately 10%.