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Moscow, Russia

Alenkov V.V.,JSC FOMOS Materials | Buzanov O.A.,JSC FOMOS Materials | Khanbekov N.,Institute of Theoretical and Experimental Physics | Kim S.K.,Seoul National University | And 5 more authors.
Crystal Research and Technology | Year: 2011

Calcium molybdate is considered as a very promising scintillator material for experimental studies of rare processes. This paper reports on the production and characterization of a 40Ca100MoO4 scintillator. Using the Czochralski technique, a crystal of high optical quality with total mass 0.55 kg, 42 mm diameter (minimum) and 53 mm 1ength of the cylindrical section was produced from isotopically enriched raw materials, containing 96.1% of 100Mo and 99.964% of 40Ca. To satisfy the requirement of low intrinsic radioactivity the purity of the materials was monitored at different stages of the production process and it is shown that the concentration of 238U and 232Th in the final crystal does not exceed 0.05 ppb. The scintillation properties of 40Ca 100MoO4 were measured over the 8 - 300 K temperature range and it is found that the light yield of the 40Ca 100MoO4 crystal is very similar to that of the CaMoO 4 reference scintillator. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Biryukov S.V.,Leibniz Institute for Solid State and Materials Research | Schmidt H.,Leibniz Institute for Solid State and Materials Research | Sotnikov A.,Leibniz Institute for Solid State and Materials Research | Sotnikov A.,RAS Ioffe Physical - Technical Institute | And 3 more authors.
IEEE International Ultrasonics Symposium, IUS | Year: 2014

Recently big size high quality piezoelectric single crystals of Ca3TaGa3Si2O14 (CTGS) have been grown. This temperature durable crystal is very promising for future application in different devices based on surface acoustic waves (SAW) due to its high electromechanical coupling compared to quartz. In contrast to the popular langasite, CTGS is a more ordered compound and therefore stands for better characteristics at both, high temperatures and high frequencies. During the last decade several sets of material constants for CTGS were published extracted from bulk acoustic wave measurements on small samples, but these results are strongly different from each other. Moreover, all published constant sets lead to unacceptable numerical differences for calculated SAW velocities when compared to recent measurements of SAW velocities on large CTGS wafers. In this work we present a new set of room temperature CTGS material constants, extracted by combination of high-precision SAW phase velocity measurements with proprietary numerical procedures developed in-house. © 2014 IEEE.

Kim H.J.,Kyungpook National University | Annenkov A.N.,Moscow Institute of Steel And Alloys | Boiko R.S.,Institute for Nuclear Research of Ukraine | Buzanov O.A.,JSC FOMOS Materials | And 26 more authors.
IEEE Transactions on Nuclear Science | Year: 2010

Search for neutrino-less double beta decay of 100Mo is proposed using active method with Ca 100MoO4 scintillation crystals which show the brightest scintillation light among variety of inorganic scintillation materials containing Mo. Study of X-ray luminescence and scintillation properties such as energy response, number of photoelectrons/keV, absolute light yield, decay time, pulse shape discrimination and radioactive contamination of CaMoO4 crystals grown by the Czochralski method with different conditions are presented. Further R&D of resolution optimization, crystal quality improvement and background reduction are underway. Significant improvement of sensitivity to neutrino-less double beta decay can be achieved by using 100Mo enriched Ca 100MoO4 crystals with good energy resolution and low background. Further reduction of background induced by 48Ca two neutrino double beta decay can be achieved by using 48Ca depletion. We are planning to install several kilograms of Ca100MoO4 crystals depleted in 48Ca at underground laboratory for the neutrino-less double beta decay experiment in the near future. © 2010 IEEE.

Sotnikov A.,Leibniz Institute for Solid State and Materials Research | Sotnikov A.,RAS Ioffe Physical - Technical Institute | Smirnova E.,RAS Ioffe Physical - Technical Institute | Schmidt H.,Leibniz Institute for Solid State and Materials Research | And 3 more authors.
2015 Joint Conference of the IEEE International Frequency Control Symposium and the European Frequency and Time Forum, FCS 2015 - Proceedings | Year: 2015

Using the pulse-echo ultrasonic technique, the velocities of the longitudinal and the shear bulk acoustic waves propagating in five crystallographic directions of LGS and SNGS single crystals were measured in a wide temperature range from 4.2 to 300 K. Elastic constants are derived and treated in the frame of Varshni approach. Some characteristic parameters of the theory are obtained. Strong piezoelectric excitation survives down to liquid helium temperature. © 2015 IEEE.

Roshchupkin D.V.,Russian Academy of Sciences | Irzhak D.V.,Russian Academy of Sciences | Plotitsyna O.A.,Russian Academy of Sciences | Fakhrtdinov R.R.,Russian Academy of Sciences | And 2 more authors.
Journal of Surface Investigation | Year: 2012

A new promising piezoelectric material Ca 3TaGa 3Si 2O 14 (CTGS) has been grown using the Czochralski method. Its unit-cell parameters have been determined by means of the X-ray phase analysis method. The X-ray diffractometry method was used to study the crystal acoustic properties; the velocities of surface acoustic wave propagation were measured for the first time and the power flow angles were determined. © 2012 Pleiades Publishing, Ltd.

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