Synthesis of Bi4.5Na0.5Ti4O15 by co-precipitation route and optimization of calcination and sintering temperatures

Gupta, Ankit; Reddy, V. Raghavendra; Kurchania, Rajnish; Subohi, Oroosa

doi:10.1007/s00339-019-3088-5

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…Platelet Bi 4.5 Na 0.5 Ti 4 O 15 crystals are found pervasively spreading across the sample surface, either lying on it or vertically inserted into the cuboid BNT matrix. The formation of the Bi 4.5 Na 0.5 Ti 4 O 15 phase is most likely due to the loss of the highly volatile alkaline element Na + during the sintering process, thereby resulting in [Bi 2 O 2 ] 2+ layers 23,24 . The phase is commonly observed in the samples subjected to sintering at high temperature and/or long dwell time both of which can induce very serious evaporation of Na element (BNT → Na 2 O + Bi 4.5 Na 0.5 Ti 4 O 15 ).…”

Section: Resultsmentioning

confidence: 99%

Sintering of large‐sized and near‐stoichiometric BNT ceramics with enhanced dielectric and electrostrictive properties

Guo,

Zhu,

Zhao

et al. 2024

J Am Ceram Soc.

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Sintering for large‐sized, stoichiometric Bi0.5Na0.5TiO3 (BNT) ceramics is of great challenge due to the loss of volatile Bi/Na at A‐site of perovskite structure. In this work, BNT ceramic tile with the size of ∼10 × 10 cm2 and near‐stoichiometric composition has been successfully fabricated by Isobam‐assisted gelcasting process, followed by sintering with 1150°C calcined power bed. The powder bed used and sintering duration were found to have a great influence on the formation of the Na‐deficient phase (Bi4.5Na0.5Ti4O15) in the ceramics, and the strategies to eliminate it have been explored. The obtained ceramics exhibit a dielectric constant/loss of 673.6/0.039 at 1 kHz, as well as an electrostrictive strain of ∼0.07% which corresponds to a converse piezoelectric constant of 105.2 pm/V. Our work thus provides an effective approach to prepare large‐sized and stoichiometric BNT ceramics.

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Section: Resultsmentioning

confidence: 99%