SU620880A1

SU620880A1 - Method of checking alloy heterogeneity

Info

Publication number: SU620880A1
Application number: SU772473888A
Authority: SU
Inventors: Юрий Александрович Браташевский; Валентин Михайлович Васильков; Николай Александрович Дорошенко
Original assignee: Донецкий Физико-Технический Институт Ан Украинской Сср
Priority date: 1977-04-04
Filing date: 1977-04-04
Publication date: 1978-08-25

Description

Изобретение огноситс к способам испытаний материалов, а более конкретно к способам измерени неоднородности сплавов по составу.The invention is fire related to methods for testing materials, and more specifically to methods for measuring the heterogeneity of alloys in composition.

Известны зондовые способы контрол неоднородности материалов путем измерени удельного сопротивлени и относительной термоэлектродвижущей силы .Probe methods are known to control material inhomogeneity by measuring resistivity and relative thermoelectromotive force.

Однако эти способы не обеспечивают достаточной точности измерений.However, these methods do not provide sufficient measurement accuracy.

Наиболее блнзкНм техническим решением вл етс способ контрол неоднородности материалов с помощью измерений относительной термоэдс, возникающей в точке контакта нагретого зонда с поверхностью образца, например полупроводника , в котором градиент температуры в локальной области образца создают с помощью зонда, представл ющего собой спай термопары с микронагревателем Т2,The most blissful technical solution is to control the inhomogeneity of materials by measuring the relative thermopower occurring at the point of contact of the heated probe with the sample surface, such as a semiconductor, in which the temperature gradient in the local region of the sample is created using a thermocouple T2 junction ,

Термоэдс измер етс относительно опорного зонда в виде спа термопары без нагревател . Способ позвол ет вы вл ть неоднородности распределени примесей , которые не обнаруживаютс другими способами.Thermoelectric power is measured relative to the reference probe in the form of a thermocouple spa without a heater. The method allows detection of impurities in the distribution of impurities that are not detected by other methods.

Однако этот способ не позвол ет получить степень разрешени неоднородности в област х с микронными размерами, креме того, имеет большие погрешности измерени термоэдс, а следовательно, и неоднородности, так как температура нагретой области образца измер етс термопарой , имеющей в точке контакта с ним неконтролируемые градиенты температуры через спай, завис щие от состо ни теплового контакта зонда с образцом.However, this method does not allow to obtain the degree of resolution of the heterogeneity in areas with micron sizes, the cream also has large measurement errors of the thermopower, and hence the heterogeneity, since the temperature of the heated region of the sample is measured by a thermocouple having uncontrolled gradients junction temperatures, depending on the state of thermal contact of the probe with the sample.

Целью изобретени вл етс повышение разрешающей способности и снижение погрешности измерений.The aim of the invention is to increase the resolution and reduce measurement errors.

Claims

To do this, according to the proposed method, an electric current is passed through the adon and the sample, the thermo-electromotive force and power applied to its creation are measured, and the degree of non-uniformity is determined by the ratio of the thermo-electromotive force to this power. When measuring the relative thermopower, one branch of the thermocouple serves as a probe, and the other is the sample under study. Direct measurement of the power consumed by the creation of a temperature gradient makes it possible to avoid measurement errors of the hot spot inherent in the well-known method. An example implementation of the method. The method was tested on indium antimonide samples and its solid solutions with bismuth containing O and OS bismuth up to 2.5%, as well as on single crystal samples of bismuth and antimony bismuth alloys with bismuth content of about 5%, 90% and 85%. The thickness of the gimbal is from 2 to 10 mm. The measurements were carried out on etched surfaces and chips. A tungsten needle with a tip radius of 25 µm was used as a probe. The probe was installed on the sample using the PMT-3 microhardness tester with a loading of 2 to 5 kg and a step between the probe localization points of 5 O micron. The test results of the samples using the proposed method were compared with the chemical analysis results obtained on the REM micro X-ray analyzer, as well as obtained on a HR-2O spectrophotometer on the basis of the dependence of the intrinsic absorption edge on the bismuth content of antimonvde indium, and gave a good match. Technical and economic advantages of the method of controlling the heterogeneity of the alloys are as follows. The method allows to increase the degree of resolution of heterogeneity and reduce measurement errors compared to the known. The method is simple to implement and can be used to obtain rapid analysis without the use of expensive equipment and highly qualified personnel. Application of the method to provide savings on enterprises for the production of semiconductor materials and in scientific research ... Claims of the invention A method for controlling the heterogeneity of alloys using thermoelectromotive. the forces arising in the local area of the sample heated by the sound are distinguished by the fact that, in order to increase the resolution and reduce measurement errors, an electric current is passed through the probe and the sample, the thermoelectromotive force and the power required to create it are measured inhomogeneities are determined by the ratio of thermoelectromotive force to this power. Sources of information taken into account in the examination: 1. Kovtonyuk N. F., Kontseva Yu. A. Measurements of parameters of semiconductor materials. M., Metallurgists, 1970, p. 66-98, 310.

2. Journal Zavodska Laboratory, 1965, No. 4, p. 461.