Effects of Na nonstoichiometry in (Bi0.5Na0.5+x)TiO3 ceramics

Sung, Y. S.; Kim, J. M.; Cho, J. H.; Song, Tae-Ho; Kim, M. H.; Chong, Heap‐Yih; Park, T. G.; Do, D.; Kim, S. S.

doi:10.1063/1.3275704

Cited by 177 publications

(61 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As noted, even in this partial phase diagram, at least four additional Bi-Na-Ti-based oxide compounds including a cubic pyrochlore phase as well as five more other oxide compounds exist as stable phases other than Bi 1/2 Na 1/2 TiO 3 , making the detection of a proper isoplethal path highly challenging. In addition, the task at hand is aggravated by the fact that the functional and structural properties of BNT-based system are highly sensitive to stoichiometry [218][219][220][221], which is even harder to control during the fabrication of single crystals. One potentially promising approach to solve this issue may be to utilize solid-state single crystal fabrication method [193,198,206,222], where at least the composition of the final product is reliable.…”

Section: Perspectivesmentioning

confidence: 99%

Giant electric-field-induced strains in lead-free ceramics for actuator applications – status and perspective

et al. 2012

View full text Add to dashboard Cite

In response to the current environmental regulations against the use of lead in daily electronic devices, a number of investigations have been performed worldwide in search for alternative piezoelectric ceramics that can replace the marketdominating lead-based ones, representatively Pb(Zr x Ti 1-x )O 3 (PZT)-based solid solutions. Selected systems of potential importance such as chemically modified and/or crystallographically textured (K, Na)NbO 3 and (Bi 1/2 Na 1/2 )TiO 3 -based solid solutions have been developed. Nevertheless, only few achievements have so far been introduced to the marketplace. A recent discovery has greatly extended our tool box for material design by furnishing (Bi 1/2 Na 1/2 )TiO 3 -based ceramics with a reversible phase transition between an ergodic relaxor state and a ferroelectric with the application of electric field. This paired the piezoelectric effect with a strain-generating phase transition and extended opportunities for actuator applications in a completely new manner. In this contribution, we will present the status and perspectives of this new class of actuator ceramics, aiming at covering a wide spectrum of topics, i.e., from fundamentals to practice.

show abstract

Section: Perspectivesmentioning

confidence: 99%

Giant electric-field-induced strains in lead-free ceramics for actuator applications – status and perspective

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Sung et al [18,19] have reported that lattice distortion (90-a) is the key factor for variation in d 33 . Also Hiruma et al [12] have considered that small lattice distortion (90-a) leads to increased piezoelectric constant.…”

Section: Resultsmentioning

confidence: 98%

Role of rubidium cation substitution in the A-site of sodium bismuth titanate ceramics

Ruth

Babu

Kader

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Effect of large ionic radius cation rubidium (Rb) substitution in the A-site of sodium bismuth titanate (Bi 0.5 Na 0.5-x Rb x ) TiO 3 ceramics is studied. Influence of substitution on intrinsic and extrinsic contribution and impact on ferroelectric properties and piezoelectric constant are investigated. Small rhombohedral lattice distortion (d r ) and minimum homogeneous strain (d) are the primary intrinsic parameters which favors the extrinsic parameters such as domain wall motion and mobility of non-180°domain switching. Enhanced mobility softens the coercive field and increases remnant polarization to maximum. Reduced lattice distortion, low strain and enhanced mobility are the significant factors for enhanced piezoelectric constant, highest remnant polarization and decreased coercive field in (Bi 0.5 Na 0.5-x Rb x ) TiO 3 ceramics.

show abstract

“…T d , on the contrary, was as low as 127 C at y ¼ À3.5 mol% in Na-deficient compositions and higher in compositions with excessive Na. An inversely proportional relation between d 33 and T d induced by either Bi or Na nonstoichiometry became obvious and was attributed to lattice distortions in the case of Na nonstoichiometry [52]. From these results, it is clear that Bi and Na nonstoichiometry affected piezoelectric and dielectric properties in an opposite way.…”

Section: Nonstoichiometry By Means Of A-site Intrinsicmentioning

confidence: 88%

“…The peaks correspond to the rhombohedral BNT phase, but no secondary phase peak was observed within the samples tested for deficient to excessive compositions of Bi or Na. These XRD patterns were further analyzed to calculate variations in lattice parameters, and lattice distortion turned out to be a key factor, affecting both d 33 and T d [51][52][53].…”

Section: Nonstoichiometry By Means Of A-site Intrinsicmentioning

confidence: 99%

Nonstoichiometry in (Bi0.5Na0.5)TiO3 Ceramics

Sung

Kim

2011

Lead-Free Piezoelectrics

View full text Add to dashboard Cite

Among Bi alkali metal titanate piezoceramics [1][2][3][4][5][6][7][8][9][10], (Bi 0.5 Na 0.5 )TiO 3 (BNT) is a typical system that has been known for many years. Its structure was identified as ABO 3 perovskite with rhombohedral symmetry. However, it was long ago concluded that, due to its properties, it was not viable to compete with Pb(Zr,Ti)O 3 (PZT)-based ceramics. Not surprisingly, it did not draw much attention until the toxicity of the PZT oxide became a critical environmental issue. In particular, Pb and Pb oxide processing and waste disposal are harmful to the environment. Restrictions have been imposed on the use of hazardous substances; however, PZT-based ceramics have been an exception because substitute materials have not been available. In light of this situation, Pb-free materials have been rigorously studied. Thus far, none of the currently available Pb-free materials has shown properties comparable to those of PZT.BNT is such a Pb-free material frequently mentioned in the literature. However, there are still ambiguities in the characteristics of BNT itself because most of the research piling up on BNT has been based solid solutions with morphotropic phase boundary (MPB) compositions which are expected to have a similar success to PZT solid solutions [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. As expected, high properties have been obtained but the values themselves have been below expectations as compared with PZT. In particular, key properties such as the piezoelectric coefficient (d 33 ) and the depolarization temperature (T d ) are not good enough to replace PZT. To be able to improve the BNT properties, it is necessary to understand the end members of solid solutions. Here, T d is a unique property in BNT, not observed in PZT, but acting as a counterpart of the Curie temperature (T c ) of PZT, which has been observed to be

show abstract

Effects of Na nonstoichiometry in (Bi0.5Na0.5+x)TiO3 ceramics

Cited by 177 publications

References 24 publications

Giant electric-field-induced strains in lead-free ceramics for actuator applications – status and perspective

Giant electric-field-induced strains in lead-free ceramics for actuator applications – status and perspective

Role of rubidium cation substitution in the A-site of sodium bismuth titanate ceramics

Nonstoichiometry in (Bi0.5Na0.5)TiO3 Ceramics

Contact Info

Product

Resources

About