Recombination luminescence of radiation defects in NaCl and NaCl-Li crystals at low-temperature elastic deformation

Authors

  • L. Myasnikova K. Zhubanov Aktobe Regional State University, Aktobe, Kazakstan
  • K. Shunkeyev K. Zhubanov Aktobe Regional State University, Aktobe, Kazakstan
  • Zh. Ubayev K. Zhubanov Aktobe Regional State University, Aktobe, Kazakstan
  • Sh. Sagimbaeva K. Zhubanov Aktobe Regional State University, Aktobe, Kazakstan
  • Zh. Kulbatyr K. Zhubanov Aktobe Regional State University, Aktobe, Kazakstan

DOI:

https://doi.org/10.26577/RCPh-2019-i4-10
        101 51

Abstract

Using the experimental method of highly sensitive thermoactivation spectroscopy, we studied the spectra of thermally stimulated luminescence (TSL) of purified crystals of NaCl and NaCl-Li under low-temperature (95 K) elastic deformation ( ) in a wide range of the spectrum (200¸850 nm). In the TSL of a NaCl crystal, the dominant peak is an -center, whose intensity doubles during low-temperature deformation and has a maximum of thermal damage at 165–170 K, scanning of which corresponds to the maximum of the TSL spectrum at 3.5 eV. The spectrum of the TSL -peak and the X-ray luminescence coincide and have the same nature – the radiative relaxation of self-trapped excitons upon recombination of mobile holes with electrons. In NaCl-Li TSL, the dominant peaks are F/ and HA (Li) centers, the intensity of which increases 10-fold during low-temperature deformation and having maximum thermal destruction at 110 K and 125 K, respectively. When scanning the TSL spectra at peaks 110K and 125K, we observed radiation with maxima at 2.72 eV and 2.69 eV. An analysis shows that a light lithium cation in the NaCl-Li lattice creates a local deformation as a result of which HA (Li) centers appear. Elastic deformation further stimulates the formation of HA (Li) -centers, evidenced by a 13-fold increase in the intensity of the TSL peak at 125K.

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How to Cite

Myasnikova, L., Shunkeyev, K., Ubayev, Z., Sagimbaeva, S., & Kulbatyr, Z. (2019). Recombination luminescence of radiation defects in NaCl and NaCl-Li crystals at low-temperature elastic deformation. Recent Contributions to Physics (Rec.Contr.Phys.), 71(4), 75–81. https://doi.org/10.26577/RCPh-2019-i4-10

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Condensed Matter Physics and Materials Science Problems. NanoScience