Crystal structure, dielectric relaxation and magnetic properties of Ba5NdNiNb9O30 ceramics

Wu, Yong; Gu, Shuqing; Wang, N.; Chen, X.M.; Li, J.

doi:10.1016/j.matchemphys.2011.11.056

Cited by 13 publications

(2 citation statements)

References 25 publications

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“…Because of the great flexibility of structure, the filled tungsten bronze ceramics have been investigated as the possible multiferroic materials by introducing magnetic Fe 3+ ions into B site . An essential way to design the multiferroic tungsten bronzes is to substitute the magnetic ions such as Fe 3+ for Ti 4+ in Ba 4 R 2 Ti 4 Nb 6 O 30 (R = rear earth) and Ba 4 Bi 2 Ti 4 Nb 6 O 30 , and then a number of possible multiferroic materials with the formula of Ba 4 R 2 Fe 2 Nb 8 O 30 and Ba 4 Bi 2 Fe 2 Nb 8 O 30 can be expected.…”

Section: Possible Multiferroicity In Filled Tungsten Bronze Ceramicsmentioning

confidence: 99%

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Zhu

Chen

2014

J. Am. Ceram. Soc.

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A comprehensive review on the latest development of the ferroelectric transition and low-temperature dielectric relaxations of filled tungsten bronze ceramics are presented together with some new issues. In the filled tungsten bronze ceramics M 6 -p R p Ti 2+p Nb 8 -p O 30 (p = 1, 2; M = Ba or Sr; R = rare earth or Bi), a ferroelectric transition is generally indicated together with up to three low-temperature dielectric relaxations. The ferroelectric transition is determined as 4/ mmm ? 4 mm, and the low-temperature dielectric relaxations are deeply concerned with the structure modulations due to the order/disorder of ions in A1 and A2 sites, their random cross occupancy, and the order/disorder of B-site ions. Both the ferroelectric transition and low-temperature dielectric relaxations are dominated by the composition and radius difference between A1and A2-site ions, Δr. The normal ferroelectric transition might be expected if the ratio of the biggest ion and second big ion is 2:1, otherwise the diffuse or relaxor ferroelectric is expected. Meanwhile, the larger Δr generally results in the normal ferroelectric, and the smaller Δr will lead to the diffuse or relaxor ferroelectric. Moreover, the effects of A sites order/disorder and the random cross occupancy of A-site ions are primary, and the effects of B-site ordering/disordering are secondary. The right ratio of 2:1 for A2-and A1-site ions and the large Δr should be the guidelines for designing the possible multiferroic tungsten bronzes.

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Section: Possible Multiferroicity In Filled Tungsten Bronze Ceramicsmentioning

confidence: 99%

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Zhu

Chen

2014

J. Am. Ceram. Soc.

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“…The occupation of ions with different valence (Ca 2+ and Sm 3+ ) at A1 sites and unequally distributed local electric field cause the local compositional fluctuation. [21] At temperature below 100 • C, a broad dielectric permittivity peak is observed. The temperature corresponding to the dielectric constant peak of this low-temperature region (T m ) shows a strong frequency dependence, and dielectric loss (tan δ ) shows a similar variation tendency with frequency, indicating a clear low temperature relaxation nature.…”

Section: Resultsmentioning

confidence: 99%

Dielectric and ferroelectric properties of Sr ₄ CaSmTi ₃ Nb ₇ O ₃₀ with tetragonal tungsten bronze structure

Gong¹,

Fang²,

Huang³

et al. 2014

Chinese Phys. B

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Sr4CaSmTi3Nb7O30 ceramics are synthesized and indexed as tetragonal tungsten bronze structure. The dielectric behavior and ferroelectric nature are investigated. Three dielectric anomalies are observed. The phase transition is a displacive phase transition with some diffusive characteristics, which indicates possible compositional variations within the materials on the microscopic scale. The weak distortion disappears in cooling process for differential scanning calorimetry measurement, and the large depression of Curie—Weiss temperature T0 indicates the difficulty in forming macroferroelectric domain. The ferroelectric nature in these filled tungsten bronze niobates originates from the off-center displacement of B-site cations, but they are primarily dominated by A-site cation occupation. Both the radius and the valence of A1-site cations play an important role on ferroelectric properties of the filled tungsten bronze compounds. Existence of spontaneous polarization with a remanent polarization of 0.16 μC/cm2 a coercive field of Ec = 11.74 kV/cm confirms the room-temperature ferroelectric nature of Sr4CaSmTi3Nb7O30 ceramics.

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Dielectric and relaxor ferroelectric properties of Sr4CaLaTi3Nb7O30 tetragonal tungsten bronze ceramics

Zerihun

Gong

Huang

et al. 2015

Ceramics International

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Crystal structure, dielectric relaxation and magnetic properties of Ba5NdNiNb9O30 ceramics

Cited by 13 publications

References 25 publications

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Dielectric and ferroelectric properties of Sr ₄ CaSmTi ₃ Nb ₇ O ₃₀ with tetragonal tungsten bronze structure

Dielectric and relaxor ferroelectric properties of Sr4CaLaTi3Nb7O30 tetragonal tungsten bronze ceramics

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Crystal structure, dielectric relaxation and magnetic properties of Ba5NdNiNb9O30 ceramics

Cited by 13 publications

References 25 publications

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Ferroelectric Transition and Low‐Temperature Dielectric Relaxations in Filled Tungsten Bronzes

Dielectric and ferroelectric properties of Sr 4 CaSmTi 3 Nb 7 O 30 with tetragonal tungsten bronze structure

Dielectric and relaxor ferroelectric properties of Sr4CaLaTi3Nb7O30 tetragonal tungsten bronze ceramics

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Dielectric and ferroelectric properties of Sr ₄ CaSmTi ₃ Nb ₇ O ₃₀ with tetragonal tungsten bronze structure