Fig. 2: Ultrasonic properties of mixed MA1−xDMAxPbBr3 perovskites.
From: Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites
a Ultrasonic velocity and b attenuation of the x = 0, 0.04, 0.14, and 0.21 single crystal compounds measured on cooling. The change of the ultrasonic velocity is normalized to the room temperature value.
