Dielectric relaxation and ac conductivity in magnetoelectric YCrO3 ceramics: A temperature dependent impedance spectroscopy analysis

Temperature dependent X‐ray diffraction and Raman spectroscopy studies of polycrystalline YCrO3 ceramics across the TC ~ 460 K

“…As can be seen, the Raman intensity of all modes decreases significantly with the increase of temperature, and there are anomalous changes at FE to PE transition temperature. Interestingly, earlier reports on the temperature‐dependent permittivity data for YCO have also reported such anomaly across T C . These anomalies are much more pronounced in line widths versus temperature plot, as depicted in Figure .…”

“…In this context, rare‐earth orthochromites (RCrO 3 ) attracts the special attention with a reasonably high ferroelectric transition temperature. However, small ferroelectricity reported for RCrO 3 ~1.1 μC/cm 2 for YCO and 0.35 μC/cm 2 for LuCrO 3 at room temperature (RT) despite the large A‐cation off‐centering distortions remains puzzling. Orthorhombic YCO possess centrosymmetric Pnma crystal structure.…”

A comprehensive review on the ferroelectric orthochromates: Synthesis, property, and application

“…This was related to the ferroelectric ordering in YCrO 3 [172]. Moreover, there exists a broad peak with maximum located at T C ∼ 450 K. The strength of the maximum peak weakens, and its position moves to elevated temperatures with increasing frequency, resembling the behaviors of a YCrO 3 relaxor [172]. Additionally, one peak sitting around ∼ 570 K was also observed [172].…”

“…14, the temperature-dependent real part of dielectric permittivity measurements revealed a dielectric relaxation peak around T IP ∼ 230 K (the intermediate point of temperature). This was related to the ferroelectric ordering in YCrO 3 [172]. Moreover, there exists a broad peak with maximum located at T C ∼ 450 K. The strength of the maximum peak weakens, and its position moves to elevated temperatures with increasing frequency, resembling the behaviors of a YCrO 3 relaxor [172].…”

“…The observed dielectric anomaly around T IP may indicate a coupling between lattice and spin orders of degree mediated by magneto-dielectric correlations [185]. Mall et al performed a study of detailed temperature-and frequency-dependent dielectric behaviours of poly-crystalline YCrO 3 ceramics [172]. The XRPD study as well as the corresponding structural refinement demonstrated a single phase with space group of Pnma (orthorhombic) as displayed in Fig.…”