Dielectric, Ferroelectric, and Magnetic Characteristics of LuFeCuO₄ Ceramics

Abstract

The LuFeCuO4 ceramics with a rhombohedral crystal structure in space group R3¯m were prepared by a solid‐state reaction process, and both the dielectric and magnetic characteristics were investigated. An obvious dielectric relaxation with activation energy of 0.37 eV was observed, which could be well fitted by the modified Debye equation and Arrhenius law. A P–E hysteresis loop was observed in the present ceramics at 150 K, with a remnant polarization of 5.78 × 10−2 μC/cm2 and a coercive field of 10.76 kV/cm. The LuFeCuO4 was antiferromagnetic with TN of 57 K, and a slim hysteresis loop observed at 5 K demonstrated the weak ferromagnetic behavior below Néel temperature. The room‐temperature magnetodielectric response in LuFeCuO4 suggested the existence of magnetic–dielectric coupling.

Structural evolution and thermophysical properties of (SmxGd1−x)2Zr2O7 (0≤x≤1.0) ceramics

“…Thermal diffusivity of (SmxGd1−x)2Zr2O7 bulk ceramics at different temperatures thermal expansion coefficients of (Sm x Gd 1−x ) 2 Zr 2 O 7 bulk ceramics rapidly increase from room temperature to about 300 • C, which is caused by nonlinear increase of instrument temperature, and similar phenomena was reported by Qin et al [23]. The linear thermal expansion coefficients of all (Sm 1−x Gd x ) 2 Zr 2 O 7 samples increase with the increase of temperature, which is attributed to the increasing atomic spacing at elevated temperatures.…”

Influence of gadolinia on thermal expansion property of ZrO2–4.5mol%Y2O3 ceramics

“…2, the technical thermal expansion coefficients of YSZ-xGd 2 O 3 ceramics increase with increasing test temperature, which is a typical characteristic of solid materials as the atomic spacing increases with increasing test temperature. The technical thermal expansion coefficients of YSZ-xGd 2 O 3 ceramics increase rapidly from room temperature to about 200 • C, which is caused by nonlinear increase of the instrument temperature, and the similar phenomenon was also reported by Qin et al [9]. The average linear thermal expansion coefficient is defined as the value of the relative length change in the temperature range of T 1 < T < T 2 , as described by the following equation:…”