Boris Redkin

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Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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9 April 2021 in Crystals

Journal Article

Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures

Electrical conductivity and acoustic loss Q⁻¹ of single crystalline Li(Nb,Ta)O₃ solid solutions (LNT) are studied as a function of temperature by means of impedance spectroscopy and resonant piezoelectric spectroscopy, respectively. For this purpose, bulk acoustic wave resonators with two different Nb/Ta ratios are investigated. The obtained results are compared to those previously reported for congruent LiNbO₃. The temperature dependent electrical conductivity of LNT and LiNbO₃ show similar behavior in air at high temperatures from 400 to 700 °C. Therefore, it is concluded that the dominant transport mechanism in LNT is the same as in LN, which is the Li transport via Li vacancies. Further, it is shown that losses in LNT strongly increase above about 500 °C, which is interpreted to originate from conductivity-related relaxation mechanism. Finally, it is shown that LNT bulk acoustic resonators exhibit significantly lower loss, comparing to that of LiNbO₃.

16 November 2020 in Acta crystallographica Section B, Structural science, crystal engineering and materials

Journal Article

Single crystals of ferroelectric lithium niobate–tantalate LiNb_1–xTa _x O₃ solid solutions for high-temperature sensor and actuator applications

+11

1 April 2026 in Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques

Journal Article

Microindentation of the Cleavage Plane of CdWO4 Single Crystals

Elena Borisenko

Boris Redkin

N. N. Kolesnikov

In this paper microindentation of the cleavage plane (010) of CdWO₄ single crystals was studied. It has been found that plastic deformation in these crystals is driven by two mechanisms: dislocation slip and twinning. Relatively low stacking fault energy may be the reason for dual mechanism of the deformation. Chemical etching reveals dislocation rosettes containing two sets of dislocation rays running from the imprint in two opposite directions 〈001〉. Dislocation slip and twinning caused by microindentation were studied. Dislocation paths shorten and plasticity zone decreases from the surface inside. Dislocation paths increase linearly as stresses increase. Broadening of the dislocation rays caused by higher stress is restrained by radial and ring-shaped crack openings, which make sinks near an imprint. Microhardness decreases exponentially as load increases.

About Me

Redkin B. S. has been working at the Institute of Solid State Physics of the Russian Academy of Sciences (ISSP RAS) since 1977 after graduating from the Faculty of Physics and Technology of the Moscow Mining Institute. In 1986, he defended his PhD thesis on the topic "Production of profiled ferroelectric crystals of lithium niobate and tantalate". Since 1993, he has been working as a senior researcher. Redkin B. S. is a specialist in the field of growing oxide single crystals from a melt. For 44 years of work at the ISSP RAS, he conducted research on the growing conditions and studied the physical properties of such crystals a lithium niobate and tantalate, a number of rare-earth molybdates and tungstates, lead, cadmium and zinc tungstates, as well as a number of others. The crystals listed above are widely used both for basic research and for the manufacture of various devices and devices. Redkin B. S. also took an active part in the creation of new equipment for growing crystals. He is the author of about 100 scientific papers and inventions.

Boris Redkin

Boris Redkin

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