Phase transition in the family LaxBi4−xTi3O12: In relation to lattice symmetry and distortion

Shimazu, Masaji; Tanaka, Junzo; Muramatsu, K.; Tsukioka, Masayuki

doi:10.1016/0022-4596(80)90538-1

Cited by 28 publications

(22 citation statements)

References 5 publications

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“…Its effects on ferroelectricity in SBN were different from the effects of the other ions which substituted Sr 2+ or Nb 5+ ions in perovskite-like layer. Decrease of T C with La 3+ doping in Bi 3+ sites has already reported in BIT [14]. For the hexa-valent ions of Mo 6+ and W 6+ , these two ions have almost same ion sizes but their effects on T C were very different.…”

Section: Discussionmentioning

confidence: 74%

Ionic Doping Effects in SrBi2Nb2O9 Ferroelectric Ceramics

et al. 2004

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Ionic doping effects of various ions in Bi-layered ferroelectric SrBi 2 Nb 2 O 9 (SBN) ceramics were studied. Un-doped and doped SBN ceramics with Ba 2+ , Pb 2+ , Ca 2+ , Bi 3+ , La 3+ , Ti 4+ , Mo 6+ , and W 6+ ions were made with solid state reactions. Temperature dependent dielectric constants were measured. Ferroelectric transition temperature (T C ) decreased with Ba 2+ and Pb 2+ ions but increased with Ca 2+ ion which substitutes the 12-coordinated Sr 2+ site. T C increased with Ti 4+ , Mo 6+ , and W 6+ ions which substitute the 6-coordinated Nb 5+ sites. With trivalent Bi 3+ and La 3+ ions, T C increased with Bi 3+ ion but much decreased with La 3+ ion. These results showed that the ion size plays an important role in ferroelectricity of SBN ceramics.

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Section: Discussionmentioning

confidence: 74%

Ionic Doping Effects in SrBi2Nb2O9 Ferroelectric Ceramics

et al. 2004

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“…Rare-earth ion modified BIT (Bi 4−x Ln x Ti 3 O 12 ; Ln=La, Nd, Sm) films were reported to have relatively high ferroelectricity and good fatigue-free characteristics [7][8][9]. The ferroelectric property of the Bi 4−x La x Ti 3 O 12 ceramics differs according to the value of x [3,10]. When the value of x changes from x=0 to x=1.50, the ferroelectric phase transition temperature (T C ) of the Bi 4−x La x Ti 3 O 12 ceramics shifts from 650 to −100°C, as reported by Takenaka and Sakata [3].…”

Section: Introductionmentioning

confidence: 98%

“…BLSF ceramics have the general formula of (Bi 2 O 2 ) 2+ (A m−1 B m O 3m+1 ) 2− , where A=Bi, Pb, Ba, Sr, La, Ca, Na, K; B=Ti, Nb, Ta, W, Mo, Fe, Co, Cr, and m is the number of BO 6 octahedrals in the pseudoperovskite block (m=2, 3, 4, 5) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Bi 4 Ti 3 O 12 (BIT) is one of the more extensively studied materials among the BLSF family due to its large spontaneous polarization along the a-axis (approximately 50 μC/cm 2 ), [4] low processing temperature, high Curie temperature, and lead-free composition.…”

Section: Introductionmentioning

confidence: 99%

Structure dependence of the ferroelectric properties of Bi3.25Ln0.75Ti3O12 (Ln=La, Nd, Sm, Dy) ceramics

et al. 2007

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We have fabricated rare-earth ion substituted bismuth titanate (BIT) ceramics, Bi 3.25 Ln 0.75 Ti 3 O 12 (BLnT; Ln=La, Nd, Sm, Dy), using the conventional solid-state reaction method and have investigated the changes in the structural distortion and electrical properties, which resulted from the substitution of the rare-earth ions in BIT ceramics. As the ionic radius of the rare-earth ion substituted into the BIT decreased, the structural distortion and decreases in the unit cell volume became more pronounced as well as the Curie temperature increased monotonically from 354°C (BLaT) to 480°C (BDyT). BNdT ceramics had relatively high remanent polarization value (12.5 μC/cm 2 ) at an applied electric field of 130 kV/cm. The extent of the structural distortion influenced the dielectric and ferroelectric properties of the BLnT ceramics.

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“…Doped BIT is of interest in high-temperature piezoelectric sensors, because it remains ferroelectric at T > 600 °C and offers relatively high piezoelectric property (Kumar, 2001;Nagata, 1999;Noguchi, Sugibuchi, 1975;Shimakawa, 2000;Subbarao, 1961;2000;Shulman, 2000;Shimazu, 1980 2x Nb x Ta x O 12 powders calcined at 800 °C for 4 h were prepared and their crystal structures were analyzed using XRD. Fig.…”

Section: Nb/ta Modified Bi 4 Ti 3 O 12 Ceramicsmentioning

confidence: 99%