explored samples

In operation monocrystal edges paratellurita having the shape of the plane-parallel plates which have been cut out perpendicularly following directions have been explored: [ON], the [1Ї0], [001], [010] and 2 cubes having various optical properties, which leg it is equal 1 see Samples had next sizes: d ∣-0.87 mm, S ∣-37 мм2; Ch-O.? Mm, S:-37 мм2; ch-0.91 mm, S ^-36 мм2; d ∣-0.67 mm, S^37 мм2, accordingly. Samples of monocrystals paratellurita, grown up by a method Chohralsky were explored. Vytjagivanie it was yielded in a direction [1Ї0].

Germanium monocrystals gained with crystallographic orientation , the diversion from orientation did not exceed 1,5 . The doping was carried out by introduction ligatury in an initial fill. Cultivation of monocrystals was yielded in vacuo in a graphite thermal knot; in case of a doping bismuth cultivation carried out in nitrogen atmosphere. A method Chohralsky grew up monocrystals in the form of cylindrical ingots in diameter 40 - 45 mm, length 200 - 300 mm. A method of directional crystallisation gained large-sized monocrystals in diameter of 150 and 200 mm.

As initial raw materials used zonnoochishchennyj polycrystalline germanium (mark GPZ). Chemical cleanliness GPZ spots a material specific resistance - more than 47 Om cm (at temperature 23oC); concentration of charge carriers makes l, 5∙1012см ' 3, and mobility of charge carriers at level 3,7∙IO4cm2∕B∙c.

In the grown up monocrystals concentration of the electroactive impurities was spotted by an indirect method - on the basis of specific resistance measurings (UES) chetyrehzondovym a method on shlifovannyh face surfaces of samples by means of device PIUS-1UM (a gamut
Measured UES 0,0001-800,0 Ohm-sm at a measuring error: +/-2 %). Homogeneity of allocation of an impurity on section and height of samples was in limits of 10 % for values of a specific resistance (15 - 47) Om cmи 5 - 8 % for a gamut (0,1 - 15,0) Omsm.

Crystals for optical examinations measured 039 χ 11 mm, 0150 h 16 mm, 0200 h 16 mm, 0200 h 18 mm. Crystals were polished on section 2.2.1 procedure.

Crystals for examinations teplofizicheskih performances were grown up from a melt by an expedient Chohralsky. As a dope used antimony and gallium. Samples for measurings cut out in the size 10 h 10 h 5 mm from orientations of a plane 10 h 10 mm in directions , , .

The medial dislocation density in crystals made (0,5-l, 2) ∙104 sm "2. Optical measurings of samples bezdislokatsionnogo the germanium alloyed by antimony are Besides, spent.

Samples for examination of influence of concentration of oxygen on a spectrum of phonon uptake plotted on the basis of not alloyed monocrystals which have been grown up from a melt by a method of Chohralsky nitrogen in atmosphere under a stratum of flux LhO; with addition in a composition of a flux of dioxide of germanium GeO2 [112, 202-204]. Concentration opticheski the active oxygen spotted on intensity of oxygen peak of uptake [112].


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A source: Gavaljan Mamikon JUrevich. Influence of crystallographic orientation and the impurity composition on optical, the dielectric and teplofizicheskie performances of crystals of germanium and paratellurita. The dissertation on competition of a scientific degree of the candidate of physical and mathematical sciences. Tver - 2016. 2016

More on topic explored samples:

  1. Performances of explored samples
  2. Explored samples
  3. the performance of explored samples
  4. explored materials
  5. explored materials
  6. Measuring of a roughness of a surface of the explored sample
  7. making of contacts on explored plates and crystals
  8. parametres of the made samples
  9. 2.2. Procedures of examination of structure of samples
  11. measuring transport and volt-ampere characteristics of samples
  12. 4.4.1. Measuring BAX and a specific resistance of samples
  13. 2.1. Preparation and the basic performances of samples
  14. samples and materials
  15. dependence of the dielectric performances of samples of ceramics BTS on number of stratums with different concentration of tin.
  16. 2. 1 1 Manufacturing of volume samples of alloys Fe-Rh