Some characteristics of Ba, Sr, Na niobates

Uitert, L. G. Van; Rubin, J. J.; Grodkiewicz, W. H.; Bonner, William A.

doi:10.1016/0025-5408(69)90018-x

Cited by 69 publications

(16 citation statements)

References 7 publications

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“…These materials, known to exhibit diverse properties as a result of compositional flexibility and by a higher probability for cation ordering, may offer better ways of attaining room-temperature ferroelectricity and (anti)ferromagnetism, multiferroic behaviour and eventually magnetoelectric coupling [2,8]. Whilst ferroelectric TTBs (including Ba 2 NaNb 5 O 15 [9][10][11] and (Ba,Sr)Nb 2 O 6 [12][13][14]) were widely investigated during the 1960s and 1970s, our understanding of manipulating this structure type is still poor, with the research surprisingly limited compared to that in perovskites [5]. Early attempts focused on tungsten bronzes of nominal composition A 6 B 10 O 30 (mainly compositions where the C-sites are vacant).…”

Section: Introductionmentioning

confidence: 99%

Elastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopy

Rotaru

Schiemer

Carpenter

2016

J Therm Anal Calorim

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Tetragonal tungsten bronze (TTB) structures offer some promise as lead-free ferroelectrics and have an advantage of great flexibility in terms of accessible composition ranges due to the number of crystallographic sites available for chemical substitution. The ferroic properties of interest are coupled with strain, which will be important in the context of stability, switching dynamics and thin film properties. Coupling of strain with the ferroelectric order parameter gives rise to changes in elastic properties, and these have been investigated for a ceramic sample of Ba 6 GaNb 9 O 30 (BGNO) by resonant ultrasound spectroscopy. Room temperature values of the shear and bulk moduli for BGNO are rather higher than for TTBs with related composition which are orthorhombic at room temperature, consistent with suppression of the ferroelectric transition. Instead, a broad, rounded minimum in the shear modulus measured at *1 MHz is accompanied by a broad rounded maximum in acoustic loss near 115 K and signifies relaxor freezing behaviour. Elastic softening with falling temperature from room temperature, ahead of the freezing interval, is attributed to the development of dynamical polar nanoregions (PNRs), whilst the nonlinear stiffening below *115 K is consistent with a spectrum of relaxation times for freezing of the PNR microstructure.

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Section: Introductionmentioning

confidence: 99%

Elastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopy

Rotaru

Schiemer

Carpenter

2016

J Therm Anal Calorim

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“…in K 6 Li 4 Nb 10 O 30 [13]; 'filled' compositions have fully occupied A-and B-sites but the C-site is vacant, e.g. in Ba 2 NaNb 5 O 15 [14][15][16]; finally, 'unfilled' compositions exist where the A-site is only partly occupied (typically 5/6). The latter category includes the first reported ferroelectric TTB oxides PbNb 2 O 6 and (Sr,Ba)Nb 2 O 6 [17][18][19][20]; the other examples cited above are also ferroelectric.…”

Section: Introductionmentioning

confidence: 99%

Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Rotaru

Miller

Arnold

et al. 2014

Phil. Trans. R. Soc. A.

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We discuss the strategy for development of novel functional materials with the tetragonal tungsten bronze structure. From the starting composition Ba 6 GaNb 9 O 30 , the effect of A- and B-site substitutions on the dielectric properties is used to develop an understanding of the origin and stability of the dipolar response in these compounds. Both tetragonal strain induced by large B-site cations and local strain variations created by isovalent A-site substitutions enhance dipole stability but result in a dilute, weakly correlated dipolar response and canonical relaxor behaviour. Decreasing cation size at the perovskite A2-site increases the dipolar displacements in the surrounding octahedra, but insufficiently to result in dipole ordering. Mechanisms introducing small A-site lanthanide cations and incorporation of A-site vacancies to induce ferroelectricity and magnetism are presented.

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“…On the basis of the experimental results obtained and previous studies reported in literature, 2,9,10,20,21 the MPB in the BSKNN system has been proposed to lie in the ␣:␤ ϭ2:1 plane near a composition of 30%-40% of BNN, as FIG. 7.…”

Section: Discussionmentioning

confidence: 77%

Single crystal growth and ferroelectric properties of α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 solid solutions

Jiang

Guo

Bhalla

1998

Journal of Applied Physics

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Articles you may be interested inPhase structure, dielectric properties, and relaxor behavior of ( K 0.5 Na 0.5 ) NbO 3 -( Ba 0.5 Sr 0.5 ) TiO 3 lead-free solid solution for high temperature applications Ferroelectric domain wall relaxation in Ba 0.25 Sr 0.75 Ti O 3 films displaying Curie-Weiss behavior Erratum: "Two distinct dielectric relaxation mechanisms in the low-frequency range in (K 0.50 Na 0.50 ) 2 (Sr 0.75 Ba 0.25 ) Two distinct dielectric relaxation mechanisms in the low-frequency range in (K 0.50 Na 0.50 ) 2 (Sr 0.75 Ba 0.25 ) 4 Nb 10 O 30 ceramicsSingle crystals of quaternary solid solution compositions of A-site filled tungsten bronze-type ␣(Ba 1Ϫx Sr x )Nb 2 O 6 :␤(Na 1Ϫy K y )NbO 3 ͑where ␣:␤ϭ2:1, 9:2, xϭ0.75, 0.60, and yϭ0.50, 0.40, and 0.25͒ have been grown by the laser heated pedestal growth technique, both along the a axis and the c axis. The crystal growth studies, the crystallographic parameter analysis, the dielectric properties as well as the thermal expansion behavior of the as grown single crystals are reported. Compositions with low ratios of Ba and Na in the 2:1 section plane have high polarizability, low dielectric loss, and ferroelectric relaxor characteristics.

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Some characteristics of Ba, Sr, Na niobates

Cited by 69 publications

References 7 publications

Elastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopy

Elastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopy

Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Single crystal growth and ferroelectric properties of α(Ba1−xSrx)Nb2O6:β(Na1−yKy)NbO3 solid solutions

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