One-Dimensional Organic-Inorganic Hybrid Perovskite With Shear Strain

Area of Science:

• Materials Science
• Solid-State Chemistry
• Crystallography

Background:

• Room-temperature multiresponsive materials offer advanced environmental adaptability for smart devices.
• Hybrid metal halides are promising candidates but face design, stability, and manufacturing challenges.
• Developing materials with tunable properties near ambient conditions is crucial for next-generation technologies.

Purpose of the Study:

• To synthesize and characterize a novel hybrid metal halide, (R/S-2-HMD)PbBr3.
• To investigate its multiresponsive physical properties and phase transition behavior near room temperature.
• To explore its potential for applications in smart devices driven by external stimuli.

Main Methods:

• Synthesis of (R/S-2-HMD)PbBr3 using specific precursor combinations.
• Characterization of phase transitions using thermal analysis (enthalpy) and dielectric measurements.
• Evaluation of optical properties including photoluminescence and nonlinear optical response.
• Analysis of structural changes and macroscopic deformation via X-ray diffraction and strain measurements.

Main Results:

• The synthesized (R/S-2-HMD)PbBr3 exhibits reversible switching of four physical properties (enthalpy, dielectric constant, photoluminescence, nonlinear optical response) near room temperature.
• A synergistic ordered-disorder and displacement-type phase transition induces significant macroscopic shear deformation (~6.60% strain).
• Infrared light irradiation near room temperature can trigger these shape changes due to the material's phase transition temperature.

Conclusions:

• The hybrid metal halide (R/S-2-HMD)PbBr3 demonstrates remarkable room-temperature multiresponsiveness and significant deformation.
• The observed phenomena are attributed to coupled phase transitions and crystal plane slip.
• This material presents a promising platform for developing advanced smart devices activated by thermal stimuli.