Towards novel functional properties by interface reaction in mixtures of BaTiO 3 -Fe 2 O 3 composite ceramics

Boosting the High Performance of BiFeO3-BaTiO3 Lead-Free Piezoelectric Ceramics: One-Step Preparation and Reaction Mechanisms

“…When 750 °C ≤ T cal ≤ 850 °C, un-Fe 2 O 3 appears and disappears at T cal = 950 °C. BaTiFe 2 O 6 and BaFe 12 O 19 are formed at T cal ≥ 950 °C, suggesting that a reaction occurred between Fe 2 O 3 and BaTiO 3 . − As T cal increases to 1000 °C, a new peak appears near 27.9° (Figure S18b) in addition to BaTiFe 2 O 6 and BaFe 12 O 19 , which is consistent with the (221) β peak of β-Bi 2 O 3 . Therefore, when T ≥ 1000 °C, Fe 2 O 3 reacts with BaTiO 3 to generate BaTiFe 2 O 6 and BaFe 12 O 19 , which consumes BaTiO 3 and leads to the excess α-Bi 2 O 3 , which is converted into β-Bi 2 O 3 during the cooling process.…”

Attempts to obtain BaTiO3/Fe2O3 core-shell type structures: The role of iron oxide nanoparticle formation and agglomeration

“…Sustainability of a coupling via strain requires close contacts between phases. This can be achieved in various ways: by the synthesis of composites in form of thin or tick film, by mixing adequate amounts of ingredients and subsequently sintered them to obtain ceramic composites, or by the synthesis of core/shell structures [2,[13][14][15][16][17]. Thin films are usually grown up on a substrate, and effect of substrate clamping cannot be neglected.…”

Multiferroic heterostructure BaTiO3/ε-Fe2O3 composite obtained by in situ reaction

“…To overcome the rareness and shortcomings of single phase magnetoelectrics, many magnetoelectric multiferroic composites were developed. The magnetoelectric coupling, in these materials, is a consequence of the strain induced on the interface between two different phases [3]. The final properties of such heterostructured materials can be adjusted by varying the microstructure of the constituents, their volume fraction, and/or the phase composition.…”

“…Composite materials based on α-Fe 2 O 3 /BaTiO 3 appear in various forms, such as mixed powders that are subsequently sintered, core/shell particles, or various thick films that can be prepared by simple mixing of powders, sol-gel method, etc. [3], [8], [22]. Having in mind the interesting properties of the epsilon phase of Fe 2 O 3 , multiferroic composites based on ferroelectric BaTiO 3 and magnetic ε-Fe 2 O 3 are worth being investigated, including their behaviour at elevated temperatures.…”