Abstract
The structural geometry change in the perovskite-type N(CH3)4CdBr3 single crystal near the phase transition temperature of TC = 390 K was investigated using magic angle spinning nuclear magnetic resonance techniques. For 1H and 13C nuclei, the temperature dependences of their chemical shift, spectral intensity, and spin–lattice relaxation time (T1ρ) in the rotating frame were obtained and analyzed. While the chemical shift and T1ρ of 1H showed change near TC, those of 13C did not. In addition, the 113Cd spin–lattice relaxation time T1 in the laboratory frame near TC show no evidence of anomalous change near the phase transition temperature, which coincides with the measured changes in the 1H T1ρ. The driving force for this phase transition was connected to the 1H in the CH3 groups.
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