Longitudinal elastic behavior of the mixed ferroelectric KTN

Wang, X. M.; Toulouse, J.; Boatner, L. A.

doi:10.1080/00150199008012801

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…The critical concentration for KTa 1Àx Nb x O 3 is x c 0X008 [15,27], that for K 1Àx Li x TaO 3 is x c 0X02 [28]. On the contrary, there is no obvious x c for Ba x Sr 1Àx TiO 3 [13].…”

Section: Ktaomentioning

confidence: 99%

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

Zhang¹,

Zhong²,

Wang³

et al. 1998

phys. stat. sol. (a)

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“…The critical concentration for KTa 1Àx Nb x O 3 is x c 0X008 [15,27], that for K 1Àx Li x TaO 3 is x c 0X02 [28]. On the contrary, there is no obvious x c for Ba x Sr 1Àx TiO 3 [13].…”

Section: Ktaomentioning

confidence: 99%

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

Zhang¹,

Zhong²,

Wang³

et al. 1998

phys. stat. sol. (a)

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A comprehensive study of the random dipole ferroelectrics KTN and KLT

Toulouse

1994

Ferroelectrics

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tic of the class of the random dipole ferroelectrics. Their most salient characteristic is the random substitution of a dipolar impurity in an already strongly polarizable lattice. The dipolar character of the impurity comes from its offcenter position while the presence of a soft mode gives its strong polarizability to the lattice KTaO,. The combination of these two features leads, in both systems, to a very unusual phase transition and to strongly enhanced precursor effects. We give here an overview of the results obtained from a variety of experimental techniques, all to study the same set of crystals with different concentrations; (Dielectrics, Polarization, Ultrasonics, Raman and Neutron Scattering.) The cross section of all these results provides a coherent picture of the collective behavior of the two systems and of the mechanism of the transition in random dipole ferroelectrics.The two mixed systems KLT and KTN are characteris-

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Dielectric nonlinearity and spontaneous polarization ofKTa1−xNb
Toulouse
¹
,
Wang
²
,
Knauss
³

et al. 1991
Phys. Rev. B
44
2
4
0
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KTa& Nb 03 (KTN) in an intermediate-concentration range (x= 15.7%) has been studied using dielectric-constant and spontaneous-polarization measurements. A large peak in the dielectric constant (e,"=70000)is observed at the temperature T, *. From room temperature down to T, *+20 K, e obeys a Curie-gneiss law with To-142.3 K. Below, e deviates from this law and P-E hysteresis loops are observed. These results indicate that the phase transition exhibits a diffuse character which is related to the appearance of microscopic polarized regions or cells. The e peak at T, * exhibits a cusp shape and becomes Battened upon application of low dc-bias fields. A corresponding dielectric loss peak is also observed, the position of which reveals the relaxational character of the transition. Through measurements of e(E, T) for different dc-bias fields, we have characterized the dielectric nonlinearities in the transition range; the first nonlinear coefficient, e(', diverges in two distinct ranges, as (T-T,) ", with n-9 initially and with n = 2 closer to T, *. These results suggest that diffuse phase transitions in mixed ferroelectrics are due to the ordering of polar cells modified by mutual strain interactions.

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Longitudinal elastic behavior of the mixed ferroelectric KTN

Cited by 6 publications

References 11 publications

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

A comprehensive study of the random dipole ferroelectrics KTN and KLT

Dielectric nonlinearity and spontaneous polarization ofKTa1−xNb
Toulouse
¹
,
Wang
²
,
Knauss
³

et al. 1991
Phys. Rev. B
44
2
4
0
View full text Add to dashboard Cite

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Longitudinal elastic behavior of the mixed ferroelectric KTN

Cited by 6 publications

References 11 publications

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

On the Possible Curie Temperature and Ferroelectricity for SrTiO3 and KTaO3

A comprehensive study of the random dipole ferroelectrics KTN and KLT

Dielectric nonlinearity and spontaneous polarization ofKTa1−xNbToulouse1, Wang2, Knauss3 et al. 1991Phys. Rev. B44240View full textAdd to dashboardCite

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Dielectric nonlinearity and spontaneous polarization ofKTa1−xNb
Toulouse
¹
,
Wang
²
,
Knauss
³

et al. 1991
Phys. Rev. B
44
2
4
0
View full text Add to dashboard Cite