Low temperature dielectric relaxation phenomena in relaxor ferroelectric strontium barium niobate single crystals

Povoa, J.M; Guo, Ruyan; Bhalla, A. S.

doi:10.1080/00150199408216030

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…The dielectric relaxation is observed when the thermal energy is of the order of magnitude of the potential barrier height of the local polarization state. 43 An anisotropic glassy behaviour was found in SBN for which the authors proposed a heterophase fluctuation model. 44 Another example concerns the dielectric properties of morphotropic-phase-boundary lead barium niobate TKWB (Pb 12x Ba x Nb 2 O 6 ).…”

Section: Overview Of the Various Dielectric Relaxations 41 Low Freque...mentioning

confidence: 99%

Ferroelectric ceramics: defects and dielectric relaxations

2001

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Section: Overview Of the Various Dielectric Relaxations 41 Low Freque...mentioning

confidence: 99%

Ferroelectric ceramics: defects and dielectric relaxations

2001

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“…However, the relaxational behaviour well-known in leadbased perovskite compositions have been more recently reported in tungsten bronze ceramics [1][2].…”

Section: Introductionmentioning

confidence: 98%

Preparation, characterization and dielectric study of new ferroelectric relaxors crystallizing with the tetragonal tungsten bronze structural type

et al. 2008

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The replacement of sodium and niobium by lanthanum and iron in Pb 2 NaNb 5 O 15 , have allowed to prepare the new solid state solution Pb 2 Na 1−x La x Nb 5−x Fe x 0 15 (0≤x≤1), crystallising with the tungsten bronze structure. The latter synthesized, in air, by solid state reaction, has been studied by means of X-ray and dielectric measurements. The composition dependencies of ferroelectric-paraelectric transition temperature and the lattice parameters are reported. The dielectric constants ɛ′ r and ɛ″ r have been also investigated as a function of temperature in the range 20°-700°C, and as a function of frequency in the range 1 k-13 MHz. In the composition range 0≤ x ≤0.35, the materials exhibit a typical ferroelectric-paraelectric transition while, in the composition range 0.35

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“…It has been claimed that tetragonal tungsten bronze (TKWB)-type ceramics also show such a relaxor behavior [4][5][6][7]. The difference between AMO 3 perovskite and A 2 BM 5 O 15 TKWB crystalline networks is mainly due to the existence of two different A (15 C.N.)…”

Section: Introductionmentioning

confidence: 99%

TKWB-Type Lead-Free Oxyfluoride Relaxors Derived from Ba2NaNb5O15

Alaoui-Belghiti

Simon

Elaatmani³

et al. 2001

phys. stat. sol. (a)

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Three solid solutions were prepared from Ba 2 NaNb 5 O 15 by coupled cationic and/or anionic substitutions: Ba 2--x Na 1+x (Nb 5--x W x )O 15, Ba 2--x Na 1+x Nb 5 O 15--x F x and Ba 2 NaNb 5--x Ti x O 15--x F x . They crystallize with a TKWB-type structure. In the case of oxyfluoride compositions, large frequency range dielectric studies performed on ceramics demonstrated a relaxor behavior. The greater the substitution rate, the higher the relaxor corresponding characteristics. Such a behavior is in agreement with the cationic disorder of Ba 2+ and Na + in the same crystallographic site of BaNa 2 Nb 5 O 14 F. In addition, the following transition sequence was obtained: relaxor ! ferroelectric ! paraelectric. Such ceramics constitute a new family of lead-free relaxor compositions with TKWB structure and can be used in environmental-friendly applications.

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Low temperature dielectric relaxation phenomena in relaxor ferroelectric strontium barium niobate single crystals

Cited by 10 publications

References 12 publications

Ferroelectric ceramics: defects and dielectric relaxations

Ferroelectric ceramics: defects and dielectric relaxations

Preparation, characterization and dielectric study of new ferroelectric relaxors crystallizing with the tetragonal tungsten bronze structural type

TKWB-Type Lead-Free Oxyfluoride Relaxors Derived from Ba2NaNb5O15

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