Preparation method and application of cobalt curie point standard substance

Abstract

The invention discloses a preparation method of a cobalt curie point standard substance, which comprises the following steps of: taking a cobalt foil with the purity of more than 99% as a raw material, analyzing and confirming the components and the content of the raw material, and purifying the raw material by adopting a vacuum distillation method according to different boiling points and saturated vapor pressures of the components, enabling the purified raw materials to be subjected to uniformity initial detection with a specific magnitude, and screening out the raw materials with the uniform Curie temperature to serve as candidate standard substances, and carrying out uniformity test, stability test, magnitude determination and uncertainty analysis on the candidate standard substance according to metrology requirements, and if the uniformity, stability and uncertainty meet the requirements and the magnitude is accurate and stable and meets metrology characteristics, namely, obtaining the cobalt curie point standard substance. The cobalt curie point standard substance obtained by the preparation method disclosed by the invention is accurate and stable in characteristic magnitude,can be used for verification or calibration of related instruments and evaluation of an analysis method, and provides important technical support for detection and supervision management in the fields of materials, environmental protection, biological medicines, food inspection and the like.

Description

technical field [0001] The invention belongs to the technical field of measurement, relates to the field of standard substances, in particular to a preparation method and application of cobalt Curie point standard substances. Background technique [0002] In recent years, the development of magnetic materials has been very rapid and widely used, especially the continuous emergence of new magnetic materials, which has played a huge role in promoting the progress of modern industrial technology. Therefore, it has become one of the hot fields of exploration and research by scientists from all over the world. . As one of the most important intrinsic parameters of magnetic materials, the Curie temperature is also the main physical parameter of the intrinsic magnetic properties of magnetic materials, which reflects that ferromagnetic materials change from ferromagnetic substances to paramagnetic substances with the increase of temperature, that is, Sign of the transition from mag...

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Problems solved by technology

[0005] Patent CN1198127C discloses a standard sample used for temperature calibration of thermogravimetric analyzer and its preparation method. The standard sample is composed of two samples, one The calibration temperature of the sample is 29°C, and the calibration temperature of the other is 90.4°C, but both samples are prepared by the sol-gel method, non-metal standard substances, and do not have metrological traceability

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