Structural transformations of CsPbBr3 were studied by multiple techniques (dielectric, Raman, EPR spectroscopy and XRD) in an extended temperature range.
Perovskite-like [TPrA][Cd(dca)3] undergoes four temperature-induced phase transitions associated with dielectric anomalies and one pressure-induced phase transition into a monoclinic phase.
We report a continuous-wave (CW) and pulse electron paramagnetic resonance (EPR) as well as pulse electron nuclear double resonance (ENDOR) study of Cu doped [(CH)NH][Zn(HCOO)] hybrid perovskite which exhibits a structural phase transition. The multifrequency (X, Q and W-band) CW EPR measurements allow the temperature evolution of the Cu ion local environment to be studied. The spectrum of the ordered (low-temperature) phase reveals an axially distorted octahedral Cu site confirming the successful replacement of the Zn ions and formation of the CuO octahedra. The CW EPR spectrum of the disordered (high-temperature) phase shows an additional broad line which gradually diminishes on cooling. The EPR linewidth of the axially symmetric Cu ion site exhibits an anomaly at the phase transition point and Arrhenius-type behavior in the disordered phase. The temperature dependent Cu spin Hamiltonian parameters change abruptly at the phase transition point indicating a strong first-order character of the transition. The X-band pulse ENDOR spectrum of the ordered phase reveals several protons in the vicinity of the Cu center.
In ferroelectrics, the effects of acceptor doping on electrical and electromechanical properties, often referred to as the “hardening” effects, are commonly related to domain-wall pinning mechanisms mediated by acceptor–oxygen-vacancy defect...
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