FERROELECTRIC PHASE TRANSITION IN LEAD GERMANATE Pb_{5}Ge_{3}O_{11} STUDIED BY ESR OF Gd^{3+} PROBE

Trubitsyn,; Volnianskii,; Ermakov,; Linnik,

doi:10.5488/cmp.2.4.677

Cited by 4 publications

(8 citation statements)

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“…In order to reveal the mechanisms of the anomalous broadening of EPR signals in the vicinity of ferroelectric phase transition, the orientational dependence of their linewidths was studied in detail. It must be pointed out that the obtained results do not correlate well with the conclusions presented in [1,2].…”

Section: Introductioncontrasting

confidence: 67%

“…We assume, as the authors in [1,2], that it is possible to restrict ourselves to the first terms in the expansion (5). The results of such approximation are presented in Figure 4.…”

Section: Epr and Temperature Behaviour Of The Order Parametermentioning

confidence: 98%

“…The parameters are defined in the system of coordinates with ZjjC 3 and the X axis perpendicular to the lateral face of growth. It was established that for a qualitative description of the spectrum, it is sufficient to use the isotropic g D 1.992 (1).…”

Section: Epr and Temperature Behaviour Of The Order Parametermentioning

confidence: 99%

“…Such type of investigations employs a weak dependence of the characteristic behaviour of structural phase transitions on the presence of impurity defects in a crystal in an amount necessary for the detection of paramagnetic resonance. [3À7] In our paper, the temperature dependence of spontaneous polarization was obtained from the temperature dependences of the EPR signal positions measured in a wider temperature range as compared with [1,2]. This enabled us to determine the parameters of the LandauÀDevonshire thermodynamic potential with a higher accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of [1,2] have studied the temperature dependence of resonance positions and widths of electron paramagnetic resonance (EPR) lines in the vicinity of ferroelectric phase transition in lead germanate (Pb 5 Ge 3 O 11 ), using as a probe Gd 3C ions. The data obtained have been used by the authors both for the construction of the temperature dependence of the order parameter and for the estimation of a critical interval in which thermodynamic anomalies traceable to local fluctuations of the order parameter are essential.…”

Section: Introductionmentioning

confidence: 99%

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Study of ferroelectric phase transition in Pb₅Ge₃O₁₁by paramagnetic resonance of Gd³⁺centres

et al. 2015

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To cite this article: V.A. Vazhenin, E.L. Rumyantsev, M.Yu. Artyomov & A.P. Potapov (2015): Study of ferroelectric phase transition in Pb 5 Ge 3 O 11 by paramagnetic resonance of Gd 3+ centres, Phase Transitions,The temperature dependence of the fine structure of trigonal paramagnetic Gd 3C centres in Pb 5 Ge 3 O 11 was investigated in a wide temperature range in the vicinity of structural phase transition. The temperature dependence of the squared order parameter has been constructed based on the obtained data. It was shown that for the adequate description of its behaviour, the sixth-power term in polarization must be taken into account in the expansion of the thermodynamic potential. The orientational dependence of anomalous broadening of electron paramagnetic resonance signals in the vicinity of ferroelectric phase transition was studied. By comparison of the observed behaviour with the angular dependences of the line width that are characteristic of various broadening mechanisms, it was inferred that it can be attributed to defect induced statistical dispersion of fine structure triclinic parameters.

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Section: Introductioncontrasting

confidence: 67%

“…We assume, as the authors in [1,2], that it is possible to restrict ourselves to the first terms in the expansion (5). The results of such approximation are presented in Figure 4.…”

Section: Epr and Temperature Behaviour Of The Order Parametermentioning

confidence: 98%

Section: Epr and Temperature Behaviour Of The Order Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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