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We report the structural, dielectric, ferroelectric and magnetic properties of (1- x)BiFe 0.95 Ga 0.03 Mn 0.02 O 3 − x BaTiO 3 (BFGMO− x BTO) lead-free ceramics. Structural characterizations demonstrate that the BFGMO forms single-phase solid solutions with the BTO within the doping level of x = 0.3–0.65. With increasing the content of BTO the dielectric constant and ferroelectric Curie temperature shift towards lower temperatures, exhibiting relaxor-like ferroelectric behaviors. Moreover, the remnant polarization reaches the maximum value of 2 P r ~27.67 μC/cm2 at x = 0.35 near the morphotropic phase boundary. At room temperature, remnant magnetization increases - to the maximal value of 2 M r ~0.584 emu/g at x = 0.45, which is attributed to local lattice distortion and destruction of the spiral antiferromagnetic spin structure upon the doping of BTO. The coexistence of ferroelectric and ferromagnetic performance at room temperature makes the environment-friendly BFGMO− x BTO ceramics potential candidate for multiferroic device applications. [ABSTRACT FROM AUTHOR]

Superconducting thin films of FeSe 0.5 Te 0.5 are epitaxially grown on piezoelectric 0.71Pb(Mg 1/3 Nb 1/2 )O 3 -0.29PbTiO 3 (PMN-PT) single-crystal substrates. Upon the application of an electric field to the PMN-PT along the thickness direction the superconducting properties of the FeSe 0.5 Te 0.5 films, such as the normal-state resistance, superconducting phase transition temperature, upper critical field, critical current, and coherence length are in situ modified via the ferroelectric polarization rotation, converse piezoelectric effect, and structural phase transition of the PMN-PT. Our findings demonstrate that the combination of superconducting thin films with piezoelectrically active PMN-PT offers a promising approach for exploring the intrinsic lattice strain effects of iron-based superconducting systems. [ABSTRACT FROM AUTHOR]