Study of photorefractive effect in crystals Pb5Ge3O11:Cu and Pb5Ge3O11

Gnatovsky, O.

doi:10.15407/spqeo4.03.199

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…Lead germanate (Pb 5 Ge 3 O 11 ) is a uniaxial ferroelectric with a high pyroelectric effect and a reversible optical activity (when the direction of spontaneous polarization changes) . Its perspective uses include application in recording holographic information, as well as in films and ceramics in elements of ferroelectric memory …”

Section: Introductionmentioning

confidence: 99%

Raman scattering from the effective soft mode in lead germanate crystal

Горелик

Pyatyshev

2020

J Raman Spectroscopy

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The Raman opalescence of an effective soft mode in crystalline lead germanate is investigated. Recording of Raman scattering intensity was in the x (zz)y geometry corresponding to the soft mode, responsible for ferroelectric phase transition point at 451 K. The Raman spectra were measured at fixed temperatures T (I(ω′, T); T = const) and also at fixed wavenumbers ω′ of Raman spectrometer (I(ω′, T); ω′ = ω0 – Ω = const) with slow temperature changing. The strong increase of Raman scattering intensity (Raman opalescence) has been observed at temperatures of phase transition region. The appearance of central peak scattering is attributed to the strong interaction of the effective soft mode with a low‐wavenumber nonfundamental oscillator.

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Section: Introductionmentioning

confidence: 99%

Raman scattering from the effective soft mode in lead germanate crystal

Горелик

Pyatyshev

2020

J Raman Spectroscopy

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The Formation of Dimeric Centers of Copper, Iron and Gadolinium in Modified Pb5Ge3O11

et al. 2014

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Raman opalescence near the phase transition point in lead germanate crystals

Pyatyshev¹,

Горелик

2019

J. Phys.: Conf. Ser.

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It was established that the nature of opalescence near the phase transition point in a lead germanate crystal is dynamic and is caused by a sharp increase in the spectral intensity of Raman scattering on a soft mode responsible for the instability of the crystal lattice near the phase transition temperature. Experimental studies of combination opalescence in a soft mode were performed using the method of constructing isofrequency temperature dependences of the spectral intensity for fixed values of the frequency shift Ω of the scattered radiation relative to the frequency ω0 of the exciting radiation. It is shown that the experimentally observed anomalies of the spectral intensity agree with the dynamic theory of phase transitions in crystals, based on the concept of softening of the crystal lattice in the phase transition region.

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Study of photorefractive effect in crystals Pb5Ge3O11:Cu and Pb5Ge3O11

Cited by 5 publications

References 3 publications

Raman scattering from the effective soft mode in lead germanate crystal

Raman scattering from the effective soft mode in lead germanate crystal

The Formation of Dimeric Centers of Copper, Iron and Gadolinium in Modified Pb5Ge3O11

Raman opalescence near the phase transition point in lead germanate crystals

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