A feasible pathway to stabilize monoclinic and tetragonal phase coexistence in barium titanate-based ceramics



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Necib, Jallouli and López Sánchez, Jesús and Rubio Marcos, Fernando and Serrano, Aída and Navarro Palma, Elena and Peña Moreno, Álvaro and Taoufik, Mnasri and Smari, Mourad and Rojas Hernández, Rocío Estefanía and Carmona Tejero, Noemí and Marín Palacios, María Pilar (2022) A feasible pathway to stabilize monoclinic and tetragonal phase coexistence in barium titanate-based ceramics. Journal of materials chemistry C, 46 (10). ISSN 2050-7526

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Official URL: http://dx.doi.org/10.1039/d2tc04265g


Multiphase coexistence has attracted significant interest in recent years because its control has entailed a significant breakthrough for the piezoelectric activity enhancement of lead-free piezoelectric oxides. However, the comprehension of phase coexistence still has many controversies including an adequate synthesis process and/or the role played by crystalline phases in functional properties. In this study, functional barium titanate [BaTiO_(3), (BTO)]-based materials with tunable functional properties were obtained by compositional modification via Bismuth (Bi) doping. Towards this aim, we systematically synthesized BTO-based materials by a sol-gel method, focusing on the control of Bi substitution in the BaTiO_(3) structure. In particular, we found that the substitution of Bi^(+3) leads to the stabilization of a monoclinic-tetragonal (M-T) phase boundary close to room temperature, which facilities the polarization process of the system. As a surprising result, we believe that the simple and cost-effective strategy and design principles described in this work open up the possibility of obtaining BTO-based lead-free ceramics with enhanced properties induced by the stabilization of the phase coexistence, expanding their application range.

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© 2022. The Royal Society of Chemistry
The present work has been supported by the Ministerio Español de Ciencia e Innovación (MICINN) through the projects: RTI2018-095856-B-C21 and RTI2018-095303-A-C52; Ministerio de Asuntos Económicos y Transformación Digital (MINECO) by PID2020-114192RB-C41; and Comunidad de Madrid, Spain, by S2018/NMT-4321 NANOMAGCOST and ‘‘Doctorados Industriales’’ project (IND2020/IND-17375), which is co-financed by the European Social Fund. A. S. acknowledges the financial support from the Comunidad de Madrid for an ‘‘Atracción de Talento Investigador’’ contract (2017-t2/IND5395). A. P. received funding from grant PRE2019-0875001234, Ministerio de Ciencia e Innovación (MICINN), Spain. R. E. Rojas-Hernandez acknowledges financial support from the Estonian Research Council (grants PSG-466).

Uncontrolled Keywords:Potassium-sodium-niobate; Dielectric-properties; Polarization rotation; Electrical-properties; BaTiO_(3) powder; Densification; Ba_(NO_(3))_(2); Precursor; Boundary; Behavior
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:76242
Deposited On:20 Jan 2023 17:41
Last Modified:23 Feb 2023 17:31

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