scholarly journals Tracking Structural Phase Transitions in Lead‐Halide Perovskites by Means of Thermal Expansion

2019 ◽  
pp. 1900521 ◽  
Author(s):  
Masoumeh Keshavarz ◽  
Martin Ottesen ◽  
Steffen Wiedmann ◽  
Michael Wharmby ◽  
Robert Küchler ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Halide Perovskites ◽  
Lead Halide

scholarly journals Liquid-like Interfaces Mediate Structural Phase Transitions in Lead Halide Perovskites

Matter ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 534-545 ◽  
Author(s):  
Connor G. Bischak ◽  
Minliang Lai ◽  
Zhaochuan Fan ◽  
Dylan Lu ◽  
Philippe David ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Halide Perovskites ◽  
Lead Halide

Doping Induces Structural Phase Transitions in All-Inorganic Lead Halide Perovskite Nanocrystals

2020 ◽  
Vol 2 (4) ◽  
pp. 367-375 ◽  
Author(s):  
Ju-Ping Ma ◽  
Jia-Kai Chen ◽  
Jun Yin ◽  
Bin-Bin Zhang ◽  
Qing Zhao ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Perovskite Nanocrystals ◽  
Inorganic Lead ◽  
Halide Perovskite ◽  
Lead Halide

scholarly journals Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Mantas Simenas ◽  
Sergejus Balciunas ◽  
Jacob N. Wilson ◽  
Sarunas Svirskas ◽  
Martynas Kinka ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Theoretical Study ◽  
Structural Phase ◽  
Solubility Limit ◽  
Cubic Phase ◽  
Structure And Properties ◽  
Structural Phase Transitions ◽  
Electric Dipoles ◽  
Halide Perovskites ◽  
Molecular Cations

Abstract Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in the highest performance solar cells based on mixtures of Cs, methylammonium, and formamidinium. Here, we present a multi-technique experimental and theoretical study of structural phase transitions, structural phases and dipolar dynamics in the mixed methylammonium/dimethylammonium MA1-xDMAxPbBr3 hybrid perovskites (0 ≤ x ≤ 1). Our results demonstrate a significant suppression of the structural phase transitions, enhanced disorder and stabilization of the cubic phase even for a small amount of dimethylammonium cations. As the dimethylammonium concentration approaches the solubility limit in MAPbBr3, we observe the disappearance of the structural phase transitions and indications of a glassy dipolar phase. We also reveal a significant tunability of the dielectric permittivity upon mixing of the molecular cations that arises from frustrated electric dipoles.

Observation of Structural Phase Transitions and PbI2 Formation During the Degradation of Triple-Cation Double-Halide Perovskites

2020 ◽  
Vol 3 (7) ◽  
pp. 6302-6309
Author(s):  
Afsal Manekkathodi ◽  
Asma Marzouk ◽  
Janarthanan Ponraj ◽  
Abdelhak Belaidi ◽  
Sahel Ashhab
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Halide Perovskites

Changes of thermal, mechanical and magnetic properties of an amorphous Fe80Cr5B15 alloy during magnetic and structural phase transitions

Open Physics ◽  
2006 ◽  
Vol 4 (2) ◽  
Author(s):  
Paweł Kamasa ◽  
Piotr Myśliński
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Magnetic Properties ◽  
Thermal Expansion ◽  
Phase Transitions ◽  
Structural Transition ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Scanning Calorimetry ◽  
Thermomagnetic Properties

AbstractThermal, mechanical and thermomagnetic properties associated with the magnetic and structural transition of an amorphous Fe80Cr5B15 alloy are described. The investigation was carried out in a simultaneous dilatometric and thermomagnetic experiment. An anomaly of the thermal expansion coefficient at the Curie point and a change in mechanical properties just before the onset of crystallization are observed. The results are compared with the thermal behavior obtained by differential scanning calorimetry.

Structural Phase Transitions in (n-C3H7NH3)2SbBr5

1993 ◽  
Vol 48 (3) ◽  
pp. 529-534 ◽  
Author(s):  
R. Jakubas ◽  
G. Bator ◽  
M. Foulon ◽  
J. Lefebvre ◽  
J. Matuszewski
Keyword(s):  
Thermal Expansion ◽  
Phase Transitions ◽  
Phase I ◽  
Structural Phase ◽  
Dielectric Dispersion ◽  
Structural Phase Transitions ◽  
X Ray Diffraction ◽  
Reorientational Motion ◽  
X Ray ◽  
Cooling Phase

Abstract Dielectric, DSC, thermal expansion and preliminary X-ray diffraction studies on (n-C3H7NH3)- SbBr5 are reported. It was found that this crystal undergoes a complex sequence of phase transitions. On cooling: phase I → phase II at 188.7 K (continuous), II → III at 165 K (1st order, ΔS = 26.8 J/mol K), III → IV at 137 K (1st order, 1.6 J/mol K). On heating: IV → III at 154 K, III → II’ at 168 K, II’ → II at 177 K (1st order, 2.8 J/mol K), II → I at 189 K. All 1st order phase transitions are likely due to the motion of the n-C3H7NH3+cations. The dielectric dispersion studies between 100 Hz-1 MHz within the phases I and II indicate a fast reorientational motion of dipoles with τ < 10−7 S.

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