Pressure-induced changes in the electronic and structural scenario of selected inorganic and hybrid organic-inorganic materials Martina Vrankić 1 , Takeshi Nakagawa 2 , Yang Ding 2 , Kejun Bu 2 , Jasminka Popović 1 , Xujie Lü 2 , Haozhe Liu 2 1 Division of Materials Physics, Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia 2 Center for High-Pressure Science &Technology Advanced Research, 100094 Beijing, PR China Although rational ways exist for the design of materials with advanced physical and chemical properties, the rapid growth of technologies aimed at device miniaturization and flexibility requires further advances in current materials by studying their responsiveness to various external stimuli and determining their limitations. Considering these criteria, the application of pressure-induced optical spectroscopy and transport measurements could highlight the changes in the electronic scenario of materials and decipher their intriguing and novel properties. Moreover, the mechanical properties of inorganic and hybrid organic-inorganic molecular materials, especially their response to hydrostatic pressure [1-5], are of practical importance for device fabrication and durability. In this comparative study, powder X-ray diffraction (PXRD) and structural evolution under pressure from synchrotron radiation experiments are highlighted separately for the selected inorganic semiconductors and hybrid inorganic-organic ferroelectrics (HOIF) to emphasize the necessity of this characterization method, without which it would be impossible to correlate structural and physical properties. In particular, we show that the diversity of size and shape of selected inorganic nanomaterials distinguishes the reversible phase transformation by dictating the microstructure-dependent deformation behavior and different transition-induced elastic strain responses to hydrostatic pressure up to 30 GPa. The selected inorganic materials having high bulk moduli (>100 GPa) [6] contradict the rather soft nature of HOIFs, exhibiting bulk moduli between 10 and 20 GPa. Moreover, a collection of various high-pressure data measured for the hybrid molecular ferroelectric has deciphered the flexible physical and photophysical behavior at pressures above 30 GPa, leading to a reversible band narrowing (below 1.25 eV) at relatively moderate pressure points and reversible piezochromic changes in the electronic scenario. The pressure-responsive features of both, inorganic and hybrid organic-inorganic molecular materials, in particular their response to hydrostatic pressure and directionally-induced stress, can be of practical importance for device manufacturing and durability. References 1. Ehrenreich, M. G.; Zeng, Z.; Burger, S.; Warren, M.; Gaultois, M. W.; Tan, J.-C.; Kieslich, G. Chem. Commun. 2019, 55, 3911. 2. Zhou, H.; Ding, H.; Yu, Z.; Yu, T.; Zhai, K.; Wang, B.; Mu, C.; Wen, F.; Xiang, J.; Xue, T.; Wang, L.; Liu, Z.; Sun, Y.; Tian, Y. Inorg. Chem. 2022, 61, 9631. 3. Zhang, Z.-X.; Zhang, H.-Y.; Zhang, W.; Chen, X.-G.; Wang, H.; Xiong, R.-G. J. Am. Chem. Soc. 2020, 142, 17787. 4. Fu, R.; Zhao, W.; Wang, L.; Ma, Z.; Xiao, G.; Zou, B. Angew. Chem. Int. Ed. 2021, 60, 10082. 5. Hu, Y.; Parida, K.; Zhang, H.; Wang, X.; Li, Y.; Zhou, X.; Morris, S. Al.; Liew, W. H.; Wang, H.; Li, T.; Jiang, F.; Yang, M.; Alexe, M.; Du, Z.; Gan, C. L.; Yao, K.; Xu, B.; Lee, P. S.; Fan, H. J. Nat. Commun. 2022, 13:5607. 6. Fischer, G. J.; Wang, Z.; Karato, S. I. Phys. Chem. Miner. 1993, 20, 97.
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