Crystal Structures and Piezoelectric Properties of Quenched and Slowly-Cooled BiFeO-BaTiO Ceramics.

The BiFeO-BaTiO (BF-BT) ceramics were here prepared through the solid-state reaction of BiO, FeO and nano-sized BT powders. The crystal structures and piezoelectric properties were investigated in both quenched (AQ) and slowly cooled (SC) 0.7BF-0.

Improvement of Electro-Caloric Effect and Energy Storage Density in BaTiO-Bi(Zn, Ti)O Ceramics Prepared with BaTiO Nano-Powder.

BaTiO-Bi(Zn,Ti)O (BT-BZT) ceramics have been used as capacitors due to their large dielectric permittivity and excellent temperature stability and are good candidates for lead-free materials for electrocaloric and energy storage devices. However, BT-BZT ceramics often suffer from inferior properties and poor reproducibility due to heterogeneous compositional distribution after calcination and sintering. In this work, (1-)BT-BZT ceramics ( = 0~0.

Crystal structure and spontaneous magnetism of BiFeO3 powder synthesized by hydrothermal method.

Single-phase BiFeO3 powder was successively synthesized by a low-temperature hydrothermal method. Scanning electron microscopy and transmission electron microscopy results showed that BiFeO3 powder had several hundred nanometers to micrometer-sized particles with a broad size distribution. BiFeO3 powder showed weak-ferromagnetic behavior with a small magnetization value (Ms approximately 20 memu/g) at room temperature.

Low-temperature solution growth of ZnO nanotube arrays.

Single crystal ZnO nanotube arrays were synthesized at low temperature in an aqueous solution containing zinc nitrate and hexamethylenetetramine. It was found that the pH value of the reaction solution played an important role in mediating the growth of ZnO nanostructures. A change in the growth temperature might change the pH value of the solution and bring about the structure conversion of ZnO from nanorods to nanotubes.