scholarly journals Evidence of Pressure-Induced Phase Transitions and Negative Linear Compressibility in Formamidinium Manganese-Hypophosphite Hybrid Perovskite

2021 ◽  
Author(s):  
Mirosław Ma̧czka ◽  
Mikołaj Kryś ◽  
Szymon Sobczak ◽  
Daniel Linhares Militão Vasconcelos ◽  
Paulo Tarso Cavalcante Freire ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Hybrid Perovskite ◽  
Linear Compressibility

Ferroelastic domains and phase transitions in organic–inorganic hybrid perovskite CH3NH3PbBr3

2021 ◽  
Author(s):  
Maryam Bari ◽  
Alexei A. Bokov ◽  
Zuo-Guang Ye
Keyword(s):  
Phase Transitions ◽  
Electric Field ◽  
Light Microscopy ◽  
Domain Structure ◽  
Polarized Light ◽  
External Stress ◽  
Polarized Light Microscopy ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Ferroelastic Domains

Polarized light microscopy reveals twin domains and symmetry of the phases in CH3NH3PbBr3 crystal; domain structure remains unresponsive to electric field but changes under external stress, confirming ferroelasticity while ruling out ferroelectricity.

scholarly journals Two-dimensional copper (II) halide-based hybrid perovskite templated by 2-chloroethylammonium: Crystal structures, phase transitions, optical and electrical properties

2020 ◽  
Vol 287 ◽  
pp. 121338 ◽  
Author(s):  
Farah Akrout ◽  
Fadhel Hajlaoui ◽  
Karim Karoui ◽  
Nathalie Audebrand ◽  
Thierry Roisnel ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Electrical Properties ◽  
Crystal Structures ◽  
Optical And Electrical Properties ◽  
Two Dimensional ◽  
Hybrid Perovskite

Infrared Spectra of the CH3NH3PbI3 Hybrid Perovskite: Signatures of Phase Transitions and of Organic Cation Dynamics

2020 ◽  
Vol 124 (42) ◽  
pp. 23307-23316
Author(s):  
Kirill N. Boldyrev ◽  
Vasilisa E. Anikeeva ◽  
Olga I. Semenova ◽  
Marina N. Popova
Keyword(s):  
Phase Transitions ◽  
Infrared Spectra ◽  
Organic Cation ◽  
Hybrid Perovskite

scholarly journals Structures, Phase Transitions and Tricritical Behavior of the Hybrid Perovskite Methyl Ammonium Lead Iodide

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
P. S. Whitfield ◽  
N. Herron ◽  
W. E. Guise ◽  
K. Page ◽  
Y. Q. Cheng ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Structural Phase ◽  
Photovoltaic Performance ◽  
Orthorhombic Phase ◽  
Structural Phase Transitions ◽  
Lead Iodide ◽  
First Order ◽  
Hybrid Perovskite ◽  
The Impact

Abstract We have examined the crystal structures and structural phase transitions of the deuterated, partially deuterated and hydrogenous organic-inorganic hybrid perovskite methyl ammonium lead iodide (MAPbI3) using time-of-flight neutron and synchrotron X-ray powder diffraction. Near 330 K the high temperature cubic phases transformed to a body-centered tetragonal phase. The variation of the order parameter Q for this transition scaled with temperature T as Q ∼ (Tc−T)β, where Tc is the critical temperature and the exponent β was close to ¼, as predicted for a tricritical phase transition. However, we also observed coexistence of the cubic and tetragonal phases over a range of temperature in all cases, demonstrating that the phase transition was in fact first-order, although still very close to tricritical. Upon cooling further, all the tetragonal phases transformed into a low temperature orthorhombic phase around 160 K, again via a first-order phase transition. Based upon these results, we discuss the impact of the structural phase transitions upon photovoltaic performance of MAPbI3 based solar cells.

scholarly journals Temperature-Dependent Evolution of Raman Spectra of Methylammonium Lead Halide Perovskites, CH3NH3PbX3 (X = I, Br)

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 626 ◽  
Author(s):  
Kousuke Nakada ◽  
Yuki Matsumoto ◽  
Yukihiro Shimoi ◽  
Koji Yamada ◽  
Yukio Furukawa
Keyword(s):  
Phase Transitions ◽  
Temperature Dependence ◽  
Temperature Dependent ◽  
High Power Conversion Efficiency ◽  
Perovskite Materials ◽  
Hybrid Perovskite ◽  
Temperature Ranges ◽  
Raman Study ◽  
Halide Perovskites ◽  
Motional Narrowing

We present a Raman study on the phase transitions of organic/inorganic hybrid perovskite materials, CH3NH3PbX3 (X = I, Br), which are used as solar cells with high power conversion efficiency. The temperature dependence of the Raman bands of CH3NH3PbX3 (X = I, Br) was measured in the temperature ranges of 290 to 100 K for CH3NH3PbBr3 and 340 to 110 K for CH3NH3PbI3. Broad ν1 bands at ~326 cm−1 for MAPbBr3 and at ~240 cm−1 for MAPbI3 were assigned to the MA–PbX3 cage vibrations. These bands exhibited anomalous temperature dependence, which was attributable to motional narrowing originating from fast changes between the orientational states of CH3NH3+ in the cage. Phase transitions were characterized by changes in the bandwidths and peak positions of the MA–cage vibration and some bands associated with the NH3+ group.

scholarly journals Effect of Extra-Framework Cations on Negative Linear Compressibility and High-Pressure Phase Transitions: A Study of KCd[Ag(CN)2]3

2020 ◽  
Vol 124 (12) ◽  
pp. 6896-6906 ◽  
Author(s):  
Andrew B. Cairns ◽  
Jadna Catafesta ◽  
Patrick Hermet ◽  
Jérôme Rouquette ◽  
Claire Levelut ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Pressure Phase ◽  
Pressure Phase ◽  
Linear Compressibility

(C3N2H5)3Sb2I9 and (C3N2H5)3Bi2I9 : Ferroelastic Lead-Free Hybrid Perovskite-Like Materials as the Potential Semiconducting Absorbers

2022 ◽  
Author(s):  
Przemyslaw Szklarz ◽  
Ryszard Jakubas ◽  
Wojciech Medycki ◽  
Anna Gągor ◽  
Jakub Cichos ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Lead Free ◽  
Structural Phase Transitions ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Hybrid Crystals

We have synthesised and characterised novel organic-inorganic hybrid crystals: (C3N2H5)3Sb2I9 and (C3N2H5)3Bi2I9 (PSI and PBI). The thermal DSC, and TG analyses indicate four structural phase transitions (PTs) at 366.8/366.2, 274.6/275.4,...

Successive near-room-temperature dielectric phase transitions in a lead-free hybrid perovskite-like compound

2019 ◽  
Vol 6 (1) ◽  
pp. 233-237 ◽  
Author(s):  
Jing Zhang ◽  
Shiguo Han ◽  
Xitao Liu ◽  
Chengmin Ji ◽  
Kewen Tao ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Lead Free ◽  
Hybrid Compound ◽  
Inorganic Hybrid ◽  
Dielectric Phase ◽  
Hybrid Perovskite ◽  
Successive Phase

We have reported a lead-free organic–inorganic hybrid compound, (hexamethyleneimine)2BiBr5 (1), which undergoes three successive phase transitions in the vicinity of room temperature.

scholarly journals Erratum: Corrigendum: Structures, Phase Transitions and Tricritical Behavior of the Hybrid Perovskite Methyl Ammonium Lead Iodide

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
P. S. Whitfield ◽  
N. Herron ◽  
W. E. Guise ◽  
K. Page ◽  
Y. Q. Cheng ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Lead Iodide ◽  
Hybrid Perovskite ◽  
Tricritical Behavior
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