Die for testing dislocation density of germanium single crystal

Abstract

The utility model provides a mold for testing the dislocation density of germanium single crystals. The mold comprises a plurality of nine-point method test sleeve plates and a mounting seat, the diameters of the plurality of nine-point method test cleadings are in one-to-one correspondence with the diameters of all germanium single crystal samples specified for testing the dislocation density of the germanium single crystal by the nine-point method, each nine-point method test cleadings is provided with nine test points, and the positions of the nine test points are consistent with the positions of the test points of the germanium single crystal samples with the corresponding diameters; a plurality of concave parts are arranged in the mounting seat, the plurality of concave parts are in one-to-one correspondence with all germanium single crystal samples from bottom to top, the diameters of the germanium single crystal samples are sequentially increased, and the germanium single crystal samples are specified for testing the dislocation density of the germanium single crystal by a nine-point method; the diameter of the outer circumference of the annular horizontal supporting surface corresponds to the diameter of a corresponding germanium single crystal sample, the annular horizontal supporting surface is used for supporting the germanium single crystal sample and the nine-point method test sleeve plate, and the cylindrical vertical limiting surface is used for limiting the germanium single crystal sample and the nine-point method test sleeve plate from the peripheral side.

Description

Technical Field

[0001] The present disclosure relates to the field of germanium single crystals, and more particularly to a mold for testing the dislocation density of germanium single crystals. Background Art

[0002] For the test of the dislocation density of germanium single crystals, the industry conducts the test according to the provisions of the national standard GB / T 5252-2020 Test Method for Dislocation Density of Germanium Single Crystals.

[0003] In this test method for the dislocation density of germanium single crystals, after the germanium single crystal specimen is prepared, the positions of the test points are determined by the nine-point method. As Figure 1 shown, nine test points corresponding to the diameter of the prepared germanium single crystal specimen are determined and marked according to Table 1 in GB / T 5252-2020. Then, the number of dislocation corrosion pits in the field of view of the metallographic microscope at each of the nine test points is observed, read, and recorded successively under the metallographic microscope, and then the dislocation density is determined.

[0004] For germanium single crystal specimens with different diameters, the positions of the nine test points are different. Each time, it is necessary to measure the diameter of the germanium single crystal specimen and determine and mark the positions of the corresponding nine test points, which makes the operation complex and the errors in manually determining the measurement of the diameter of the germanium single crystal specimen and the determination and marking of the positions of the nine test points large.

[0005] Chinese patent document CN209690198U mentions that the industry uses a nine-point method test template according to the standard, and the nine-point method test template corresponds to a germanium single crystal specimen with a corresponding diameter. Although this method can adapt to the test of the dislocation density of germanium single crystal specimens with any diameter and the corresponding nine-point method test template, it cannot simultaneously adapt to the test of the dislocation density of germanium single crystal specimens within the full size range specified in Table 1 of GB / T 5252-2020 and the corresponding nine-point method test template. In addition, this method is inconvenient for the positioning of germanium single crystal specimens within the full size range and the positioning of the nine-point method test template corresponding to the full size range. Summary of the Utility Model

[0006] In view of the problems existing in the background art, one object of the present disclosure is to provide a mold for testing the dislocation density of germanium single crystals, which can simultaneously adapt to the test of the dislocation density of germanium single crystal specimens within the full size range specified in Table 1 of GB / T 5252-2020 and the corresponding nine-point method test template.

[0007] Another object of the present disclosure is to provide a mold for testing the dislocation density of germanium single crystals, which is convenient for the positioning operation of germanium single crystal specimens within the full size range and is also convenient for the positioning of the nine-point method test template corresponding to the full size range.

[0008] Therefore, a mold for testing the dislocation density of germanium single crystals is provided. The mold for testing the dislocation density of germanium single crystals includes a plurality of nine-point method test templates and a mounting base. The diameters of the plurality of nine-point method test templates correspond one-to-one to the diameters of all germanium single crystal specimens specified for testing the dislocation density of germanium single crystals by the nine-point method. Each nine-point method test template is provided with nine test points penetrating through the thickness of the nine-point method test template. The positions of the nine test points are the same as the positions of the test points of the germanium single crystal specimen with the corresponding diameter specified for testing the dislocation density of germanium single crystals by the nine-point method. The mounting base is provided with a plurality of concentric concave portions that gradually increase in size from bottom to top. The plurality of concave portions correspond one-to-one to all germanium single crystal specimens with gradually increasing diameters specified for testing the dislocation density of germanium single crystals by the nine-point method from bottom to top. Each concave portion has an annular horizontal support surface and a cylindrical vertical limiting surface. The outer circumference of the annular horizontal support surface coincides with the lower peripheral edge of the cylindrical vertical limiting surface. The diameter of the outer circumference of the annular horizontal support surface corresponds to the diameter of the corresponding germanium single crystal specimen specified for testing the dislocation density of germanium single crystals by the nine-point method. The annular horizontal support surface is used to support the corresponding germanium single crystal specimen and the corresponding nine-point method test template covering the corresponding germanium single crystal specimen. The height of the cylindrical vertical limiting surface is set to be not less than the sum of the thickness of the corresponding germanium single crystal specimen and the thickness of the corresponding nine-point method test template. The cylindrical vertical limiting surface is used to limit the corresponding germanium single crystal specimen and the corresponding nine-point method test template from the peripheral side.

[0009] The beneficial effects of the present disclosure are as follows.

[0010] In the mold for testing the dislocation density of germanium single crystals according to the present disclosure, through a plurality of nine-point method test templates and a plurality of concave portions that correspond one-to-one to all germanium single crystal specimens specified for testing the dislocation density of germanium single crystals by the nine-point method, it is possible to simultaneously adapt to the germanium single crystal specimens and the corresponding nine-point method test templates for testing the dislocation density of germanium single crystals within the full size range specified in Table 1 of GB / T 5252-2020 (that is, when the diameter of the germanium single crystal specimen is between 10 mm and 100 mm, the diameter of the germanium single crystal specimen changes in increments of 1 mm, and when the diameter of the germanium single crystal specimen is greater than 100 mm, there are a total of three diameters of germanium single crystal specimens, namely 110 mm, 130 mm, and 150 mm).

[0011] In the mold for testing the dislocation density of germanium single crystals according to the present disclosure, by providing a single mounting base with a plurality of concave portions adapted to the full size range specified in Table 1 of GB / T 5252-2020, it is convenient for the positioning operation of germanium single crystal specimens within the full size range, and it is also convenient for the positioning of the corresponding nine-point method test templates. In addition, when testing under a metallurgical microscope, the mounting base is placed on the stage of the metallurgical microscope. Even if the stage is moved, since the germanium single crystal specimen and the corresponding nine-point method test template are positioned in the corresponding concave portions, the germanium single crystal specimen and the corresponding nine-point method test template will not move relative to each other, thereby ensuring the accuracy of testing for each test point under the metallurgical microscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the positions of the nine - point method test points for testing the dislocation density of germanium single crystals.

[0013] Figure 2 It is a schematic three - dimensional exploded view of the mold for testing the dislocation density of germanium single crystals according to the present disclosure, in which a nine - point method test template and a germanium single crystal specimen with a corresponding diameter are shown.

[0014] Figure 3 It is a three - dimensional sectional view of the mounting base of the mold for testing the dislocation density of germanium single crystals according to the present disclosure.

[0015] Figure 4 It is a three - dimensional sectional view of the assembled mold for testing the dislocation density of germanium single crystals according to the present disclosure, in which a nine - point method test template and a germanium single crystal specimen with a corresponding diameter are placed in the corresponding recesses of the mounting base.

[0016] Among them, the reference numerals are explained as follows:

[0017] 100 Mold for testing the dislocation density of germanium single crystals

[0018] 1 Nine - point method test template

[0019] 11 Test points

[0020] 2 Mounting base

[0021] 21 Recess

[0022] 211 Annular horizontal support surface

[0023] 211a Outer circumference

[0024] 212 Cylindrical vertical limiting surface

[0025] 212a Lower peripheral edge

[0026] 22 Bottom cylindrical hole

[0027] 23 Bottom plane

[0028] 24 Outer peripheral surface

[0029] 200 Germanium single crystal specimen DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The drawings illustrate embodiments of the present disclosure, and it will be understood that the disclosed embodiments are merely examples of the present disclosure, and the present disclosure can be implemented in various forms. Therefore, the specific details disclosed herein should not be construed as limiting, but only as a basis for the claims and as a representative basis for teaching those of ordinary skill in the art to implement the present disclosure in various ways.

[0031] AsFigures 2 to 4 As shown, the mold 100 for testing the dislocation density of germanium single crystals according to the present disclosure includes a plurality of nine-point method test templates 1 and a mounting base 2.

[0032] The diameters of the plurality of nine-point method test templates 1 correspond one-to-one to the diameters of all germanium single crystal specimens specified for testing the dislocation density of germanium single crystals by the nine-point method. Each nine-point method test template 1 is provided with nine test points 11 penetrating through the thickness of the nine-point method test template 1, and the positions of the nine test points 11 are the same as the positions of the test points of the germanium single crystal specimen with the corresponding diameter specified for testing the dislocation density of germanium single crystals by the nine-point method.

[0033] The mounting base 2 is provided with a plurality of concentric concave portions 21 that gradually increase in size from bottom to top. The plurality of concave portions 21 correspond one-to-one to all germanium single crystal specimens with gradually increasing diameters specified for testing the dislocation density of germanium single crystals by the nine-point method. Each concave portion 21 has an annular horizontal support surface 211 and a cylindrical vertical limiting surface 212. The outer circumference 211a of the annular horizontal support surface 211 coincides with the lower peripheral edge 212a of the cylindrical vertical limiting surface 212. The diameter of the outer circumference 211a of the annular horizontal support surface 211 corresponds to the diameter of the corresponding germanium single crystal specimen specified for testing the dislocation density of germanium single crystals by the nine-point method. The annular horizontal support surface 211 is used to support the corresponding germanium single crystal specimen 200 and the corresponding nine-point method test template 1 covering the corresponding germanium single crystal specimen 200. The height of the cylindrical vertical limiting surface 212 is set to be not less than the sum of the thickness of the corresponding germanium single crystal specimen 200 and the thickness of the corresponding nine-point method test template 1. The cylindrical vertical limiting surface 212 is used to limit the corresponding germanium single crystal specimen 200 and the corresponding nine-point method test template 1 from the circumferential side.

[0034] In the mold 100 for testing the dislocation density of germanium single crystals according to the present disclosure, through a plurality of nine-point method test templates 1 and a plurality of concave portions 21 that correspond one-to-one to all germanium single crystal specimens specified for testing the dislocation density of germanium single crystals by the nine-point method, it is possible to simultaneously adapt to the germanium single crystal specimens and the corresponding nine-point method test templates for testing the dislocation density of germanium single crystals within the full size range specified in Table 1 of GB / T 5252-2020 (that is, when the diameter of the germanium single crystal specimen is between 10 mm and 100 mm, the diameter of the germanium single crystal specimen changes in increments of 1 mm, and when the diameter of the germanium single crystal specimen is greater than 100 mm, there are a total of three diameters of germanium single crystal specimens, namely 110 mm, 130 mm, and 150 mm).

[0035] During operation, a germanium single crystal specimen 200 of a certain diameter is placed from top to bottom into the corresponding recess 21. Then, a nine-point method test template 1 of the corresponding diameter is placed into the corresponding recess 21 and covered on the germanium single crystal specimen 200. The space above the corresponding recess 21 that is larger than the corresponding recess 21 is used for the operator to place (such as clamping with tweezers or adsorbing with a vacuum chuck) the germanium single crystal specimen 200 and the nine-point method test template 1 of the corresponding diameter for use.

[0036] Thus, in the mold 100 for testing the dislocation density of germanium single crystals according to the present disclosure, a plurality of recesses 21 adapted to the full size range specified in Table 1 of GB / T 5252-2020 are provided through a single mounting base 2, facilitating the positioning operation of germanium single crystal specimens in the full size range and also facilitating the positioning of the nine-point method test template 1 corresponding to the full size range. In addition, when testing under a metallurgical microscope, the mounting base 2 is placed on the stage of the metallurgical microscope. Even if the stage is moved, since the germanium single crystal specimen 200 and the corresponding nine-point method test template 1 are positioned in the corresponding recesses 21, the germanium single crystal specimen 200 and the corresponding nine-point method test template 1 will not move relative to each other, thereby ensuring the accuracy when testing each test point 11 under the metallurgical microscope.

[0037] After the dislocation density of the germanium single crystal specimen 200 is tested through the field of view of the metallurgical microscope at the nine test points 11 of the nine-point method test template 1 under the metallurgical microscope, the base 2 together with the germanium single crystal specimen 200 and the nine-point method test template 1 can be inverted, and then the germanium single crystal specimen 200 and the nine-point method test template 1 can be taken out from the base 2. In an alternative embodiment, the nine-point method test template 1 and the germanium single crystal specimen 200 can be taken out from the base 2 in sequence using a vacuum chuck.

[0038] When preparing each nine-point method test template 1 and each recess 21 of the base 2, the smaller the dimensional processing error, the better. Considering the convenience of placing the germanium single crystal specimen 200 and the nine-point method test template 1 and the accuracy of positioning the germanium single crystal specimen 200 and the nine-point method test template 1, the difference between the diameter of the outer circumference 211a of the annular horizontal support surface 211 of each recess 21 and the diameter of the corresponding germanium single crystal specimen specified for testing the dislocation density of germanium single crystals by the nine-point method is a positive error. Similarly, the difference between the diameter of the outer circumference 211a of the annular horizontal support surface 211 of each recess 21 and the diameter of the corresponding nine-point method test template 1 is a positive error.

[0039] In one example, the area of the projection of each test point 11 of each nine-point method test template 1 in the thickness direction of the nine-point method test template 1 is greater than 1mm 2 but less than 1.1mm 2In this way, it is possible to take into account both the accuracy of the position of the test point 11 and the accuracy of counting the number of dislocation corrosion pits in the field of view of the metallurgical microscope at the test point 11.

[0040] In one example, as Figure 3 and Figure 4 shown, a bottom cylindrical hole 22 is further provided in the mounting base 2, and the upper end of the bottom cylindrical hole 22 communicates with the lowermost recess 21 of the mounting base 2. Further, as Figure 3 and Figure 4 shown, the lower end of the bottom cylindrical hole 22 is closed. In an alternative example (not shown), the lower end of the bottom cylindrical hole 22 opens on the bottom plane 23 of the mounting base 2. In this way, after the dislocation density test of the germanium single crystal specimen 200 is completed, the operator can insert a needle-like object into the bottom cylindrical hole 22 from below, thereby pushing up the germanium single crystal specimen 200 and the nine-point method test template 1 out of the corresponding recess 21, and then taking out the germanium single crystal specimen 200 and the nine-point method test template 1, which improves the diversity of the method for taking out the germanium single crystal specimen 200 and the nine-point method test template 1.

[0041] In one example, as Figure 2 shown, the outer peripheral surface 24 of the mounting base 2 is a cylindrical shape concentric with the plurality of recesses 21. In this way, the machining of the mounting base 2 is simplified.

[0042] The above detailed description describes multiple exemplary embodiments, but the present disclosure is not intended to be limited to the explicitly disclosed combinations. Therefore, unless otherwise specified, the various features disclosed herein can be combined together to form multiple additional combinations that are not shown for the sake of brevity.

Claims

1. A mold for testing dislocation density of germanium single crystal, characterized in that: A die (100) for testing the dislocation density of a germanium single crystal comprises a plurality of nine-point method test plates (1) and a mounting seat (2); The diameters of the plurality of nine-point method test sets (1) correspond one to one with the diameters of all germanium single crystal samples specified by the nine-point method for testing the dislocation density of germanium single crystals. Each nine-point method test set (1) is provided with nine test points (11) that pass through the thickness of the nine-point method test set (1). The positions of the nine test points (11) are consistent with the positions of the test points of the germanium single crystal samples of corresponding diameters specified by the nine-point method for testing the dislocation density of germanium single crystals. A plurality of concentric recesses (21) are provided in the mounting seat (2) and are gradually enlarged from bottom to top. The plurality of recesses (21) correspond one-to-one with all germanium single crystal samples whose diameters gradually increase as specified by the nine-point method for testing the dislocation density of the germanium single crystal. Each recess (21) has an annular horizontal supporting surface (211) and a cylindrical vertical limiting surface (212). The outer circumference (211a) of the annular horizontal supporting surface (211) coincides with the lower circumference (212a) of the cylindrical vertical limiting surface (212). The diameter of the outer circumference (211a) of the annular horizontal supporting surface (211) corresponds to the diameter of the nine-point method for testing the dislocation density of the germanium single crystal. The diameter of the corresponding germanium single crystal sample specified by the test germanium single crystal dislocation density corresponds to the diameter of the corresponding germanium single crystal sample, the annular horizontal support surface (211) is used to support the corresponding germanium single crystal sample (200) and the corresponding nine-point method test set plate (1) covering the corresponding germanium single crystal sample (200), the height of the cylindrical vertical limiting surface (212) is set to be not less than the sum of the thickness of the corresponding germanium single crystal sample (200) and the thickness of the corresponding nine-point method test set plate (1), and the cylindrical vertical limiting surface (212) is used to limit the corresponding germanium single crystal sample (200) and the corresponding nine-point method test set plate (1) from the circumferential side.

2. The mold for testing dislocation density of germanium single crystal according to claim 1, characterized in that: The projected area of ​​each test point (11) of each nine-point method test set plate (1) in the thickness direction of the nine-point method test set plate (1) is greater than 1 mm 2 But less than 1.1mm 2 .

3. The mold for testing dislocation density of germanium single crystal according to claim 1, characterized in that: A bottom cylindrical hole (22) is also provided in the mounting seat (2), and the upper end of the bottom cylindrical hole (22) is communicated with the lowermost recessed portion (21) of the mounting seat (2).

4. The mold for testing dislocation density of germanium single crystal according to claim 3, characterized in that: The lower end of the bottom cylindrical hole (22) is closed.

5. The mold for testing dislocation density of germanium single crystal according to claim 3, characterized in that: The lower end of the bottom cylindrical hole (22) opens to the bottom plane (23) of the mounting seat (2).

6. The mold for testing dislocation density of germanium single crystal according to claim 1, characterized in that: The outer peripheral surface (24) of the mounting seat (2) is cylindrical and concentric with the plurality of recessed portions (21).

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