Preparation of Experiments on Growing Zinc–Cadmium Telluride Crystals in Microgravity

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Abstract

Cd1-xZnxTe crystals are necessary for the production of ionizing radiation detectors widely used in science, technology, medicine and other fields. Internal stresses during crystallization lead to generation of dislocations and low-angle boundaries. Typical problem of melt crystal growth of Cd-Zn-Te compounds are tellurium inclusions, which deteriorate detector performance. Microgravity conditions provide unique opportunities for growing high-quality crystals due to the absence of convection, more equilibrium conditions of melt mixing, and a decrease in internal stresses. Since the properties of such crystals strongly depend on the production conditions, seeds and a feed ingot with specified compositions and structure are required. Ampoules with two compositions of materials have been prepared for the space experiment. Crystals of different compositions Cd0.96Zn0.04Te and Cd0.9Zn0.1Te were produced for two charges. They consist of an oriented seed, solvent, and feeding ingot, which are single-phased, single crystalline, have certain crystallographic orientation, meet demands for growth of Cd–Zn–Te crystals in microgravity. Ampoules containing these materials were sent to International Space Station for crystal growth on equipment already assembled at “Nauka” station.

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About the authors

А. S. Аzhgalieva

Osipyan Institute of Solid State Physics of the RAS

Author for correspondence.
Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

Е. B. Borisenko

Osipyan Institute of Solid State Physics of the RAS

Email: borisenk@issp.ac.ru
Russian Federation, Chernogolovka

D. N. Borisenko

Osipyan Institute of Solid State Physics of the RAS

Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

А. Е. Burmistrov

Research and Development Institute for Launch Complexes

Email: azhgalieva@issp.ac.ru
Russian Federation, Moscow

N. N. Кolesnikov

Osipyan Institute of Solid State Physics of the RAS

Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

А. V. Тimonina

Osipyan Institute of Solid State Physics of the RAS

Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

А. S. Senchenkov

Research and Development Institute for Launch Complexes

Email: azhgalieva@issp.ac.ru
Russian Federation, Moscow

Т. N. Fursova

Osipyan Institute of Solid State Physics of the RAS

Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

О. F. Shakhlevich

Osipyan Institute of Solid State Physics of the RAS

Email: azhgalieva@issp.ac.ru
Russian Federation, Chernogolovka

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Supplementary files

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2. Fig. 1. Lauegram of the sample of composition Cd0.96Zn0.04Te

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3. Fig. 2. Ampoule for crystal growth in microgravity: a) - assembly drawing: 1 - ampoule, 2 - inoculum, 3 - solvent zone, 4 - feed ingot, 5 - insert, 6 - spring, 7 - filler, 8 - stopper; b) - general view with loading after assembly and hermetic sealing

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4. Fig. 3. Results of X-ray phase analysis of the sample of composition Cd0.96Zn0.04Te

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5. Fig. 4. Axial distribution of components of Cd0.9Zn0.1Te crystal according to X-ray spectral analysis data

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6. Fig. 5. Transmission spectra of the samples of composition Cd0.9Zn0.1Te (a) and Cd0.96Zn0.04Te (b) in the visible range: a sharp change in transmittance occurs at the emission wavelengths of 790 and 817 nm, respectively

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