Competition between quantum fluctuation and ferroelectric order in Eu1−xBaxTiO3

A series of polycrystalline Eu1−xBaxTiO3 (0.0 ≤ x ≤ 1.0) samples were synthesized through solid-state reaction method, and their microstructural, ferroelectric, dielectric, and phase transition properties are researched. We investigated the structural properties of Eu1−xBaxTiO3 system and revealed the structure transition from cubic perovskite to tetragonal perovskite with increasing x. More importantly, it is found that there exists strong quantum fluctuation (QF) in EuTiO3 and the ferroelectric state is built only at relatively high level Ba doping. Furthermore, quantum ferroelectric state (QFE) with broad scope is revealed for Eu1−xBaxTiO3 system through our ferroelectric and dielectric measurements.