Raman‐scattering studies of pressure‐induced phase transitions in perovskite‐like acetamidninium manganese formate

Abstract

We report high‐pressure Raman scattering studies of acetamidninium manganese formate, which show evidence for two pressure‐induced phase transitions between 0.7 and 1.4 GPa and above 5.3 GPa. The first transition is related to distortion of the manganese formate framework whereas the second one affects significantly the structure of the acetamidinium cation. Significant narrowing of the lattice bands suggests that the intermediate and high‐pressure phases are ordered. High‐pressure experiments also indicate different structures of the intermediate phases observed upon compression and decompression. However, release of pressure to ambient value leads to recovery of the initial ambient‐pressure phase.

Hydrogen-bond-mediated structural variation of metal guanidinium formate hybrid perovskites under pressure

“…On the other hand, with the exception of the well-studied lead halide perovskite semiconductors [8][9][10], relatively few structural studies of materials in this family under applied pressure have been reported [11][12][13], although in some cases vibrational spectroscopy has intriguingly indicated structural changes [14,15]. In particular, spectroscopic methods have revealed high-pressure changes in many metal formate hybrid perovskites [16][17][18][19][20][21].…”

Disorder–order transitions in the perovskite metal–organic frameworks [(CH3)2NH2][M(HCOO)3] at high pressure

“…29,30 In particular, three transitions were identified for DMAMnF and DMAMgF (at 1.6(5), 3.7(5), and 5.9(9) GPa for DMAMnF and at 1.9(3), 3.7(3), and 5.4(3) GPa for DMAMgF), 29,30 and two transitions for DMACdF (at 1.6(4) and 3.5(1) GPa); 30 note that the average of the pressure points before and after the transition were employed, with the error indicating the pressure step. Many other spectroscopic studies have been carried out on related protonated-amine or ammonium metal formates that show transitions under compression, 5,[31][32][33][34][35][36] however few studies have investigated the structural distortions using diffraction. 37,38 Here we concentrate purely on the structural evolution with pressure, and study the […”

Recent advances in linear and nonlinear Raman spectroscopy. Part XIII

“…[191] Maczka and co-workers described Raman scattering of pressureinduced phase transitions in perovskite-like acetamidninium manganese formate. [192] Moshkina and co-workers observed temperature-dependent absorption lines in Raman spectra of SmFe 3 (BO 3 ) 4 ferroborate. [193] Petrov studied the Raman spectrum of ethane in a methane environment.…”

“…Liu et al studied the unravelling of the decomposition products of phosphine under high pressure where it shows superconducting behaviour . Maczka and co‐workers described Raman scattering of pressure‐induced phase transitions in perovskite‐like acetamidninium manganese formate . Moshkina and co‐workers observed temperature‐dependent absorption lines in Raman spectra of SmFe 3 (BO 3 ) 4 ferroborate .…”