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Ferroelectrics Volume 559, 2020 - Issue 1
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Articles

Structural phase transition in TbFe2.5Ga0.5(BO3)4 single crystal

A. S. KrylovKirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, Russia; Correspondence[email protected]
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I. A. GudimKirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, Russia; View further author information
,
S. N. KrylovaKirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, Russia; View further author information
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A. A. KrylovMoscow Institute of Physics and Technology, Dolgoprudny, Russia; View further author information
&
A. N. VtyurinKirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, Russia; ;Siberian Federal University, Krasnoyarsk, RussiaView further author information
Pages 128-134 | Received 28 Aug 2019, Accepted 25 Nov 2019, Published online: 09 Jun 2020
 
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Abstract

The Raman spectra of the TbFe2.5Ga0.5(BO3)4 single crystal in the temperature range from 8 to 400 K have been observed. The condensation and restoration of the soft modes have been found. The soft modes are associated with the structural phase transition from the R32 phase to the P3121 phase. The behavior of the hard modes confirms the structural phase transition close to the tricritical point. The temperature of the structural phase transition T1 = 33 K is established.

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Funding

The reported study was funded by the Russian Foundation for Basic Research according to the research project No. 18-02-00754.

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