scholarly journals Clapeyron slope of the post-perovskite phase transition in CaIrO3

2005 ◽  
Vol 32 (13) ◽  
Author(s):  
Kei Hirose
Keyword(s):  
Phase Transition ◽  
Perovskite Phase ◽  
Clapeyron Slope

scholarly journals In situ measurements of the majorite-akimotoite-perovskite phase transition boundaries in MgSiO3

2001 ◽  
Vol 28 (23) ◽  
pp. 4351-4354 ◽  
Author(s):  
Kei Hirose ◽  
Tetsuya Komabayashi ◽  
Motohiko Murakami ◽  
Ken-ichi Funakoshi
Keyword(s):  
Phase Transition ◽  
Perovskite Phase ◽  
In Situ Measurements

Stabilization of perovskite phase and dielectric properties of Pb(Zn, Mg)1/3Nb2/3O3-PbTiO3 ceramics prepared by excess constituent oxides

1994 ◽  
Vol 9 (10) ◽  
pp. 2634-2644 ◽  
Author(s):  
Hyun M. Jang ◽  
Kyu-Mann Lee ◽  
Moon-Ho Lee
Keyword(s):  
Phase Transition ◽  
Diffuse Phase Transition ◽  
Short Range ◽  
Perovskite Phase ◽  
Complex Impedance ◽  
Pyrochlore Phase ◽  
Charge Carriers ◽  
Pbtio3 Ceramics ◽  
Additional Formation ◽  
Diffuse Phase

The perovskite phase in PZN-PMN-PT (PbZn1/3Nb2/3O3-PbMg1/3Nb2/3O3-PbTiO3) pseudoternary ceramics was stabilized by the addition of excess constituent divalent oxides (PbO, MgO, and ZnO). 5 mol% excess MgO or 7.5 mol% excess PbO was sufficient to eliminate the remnant cubic pyrochlore phase after sintering at 1100 °C for 1 h. The enhanced diffuse phase transition (DPT) and the decrease in the electrical resistivity were observed in the presence of excess ZnO or MgO. These were interpreted in terms of the additional formation of negatively charged, short-range ordered 1: 1 domains with a concomitant generation of charge carriers (holes). The behavior of excess MgO or ZnO at concentrations above 5 mol% was studied by examining complex impedance patterns.

Lattice reconstruction of La-incorporated CsPbI2Br with suppressed phase transition for air-processed all-inorganic perovskite solar cells

2020 ◽  
Vol 8 (10) ◽  
pp. 3351-3358 ◽  
Author(s):  
Shoulong Chen ◽  
Tianju Zhang ◽  
Xiaolin Liu ◽  
Jinli Qiao ◽  
Lin Peng ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solar Cells ◽  
Perovskite Phase ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite

A stable CsPbI2Br perovskite phase can be achieved when doped with an appropriate amount of La3+ ions.

scholarly journals Influence of the Ringwoodite-Perovskite transition on mantle convection in spherical geometry as a function of Clapeyron slope and Rayleigh number

2011 ◽  
Vol 3 (2) ◽  
pp. 713-741 ◽  
Author(s):  
M. Wolstencroft ◽  
J. H. Davies
Keyword(s):  
Phase Transition ◽  
Rayleigh Number ◽  
Phase Change ◽  
Mantle Convection ◽  
Spherical Geometry ◽  
Earth History ◽  
Buoyancy Parameter ◽  
Seismic Discontinuity ◽  
Clapeyron Slope

Abstract. We investigate the influence on mantle convection of the negative Clapeyron slope ringwoodite to perovskite and ferro-periclase mantle phase transition, which is correlated with the seismic discontinuity at 660 km depth. In particular, we focus on understanding the influence of the magnitude of the Clapeyron slope (as measured by the Phase Buoyancy parameter, P) and the vigour of convection (as measured by the Rayleigh number, Ra) on mantle convection. We have undertaken 76 simulations of isoviscous mantle convection in spherical geometry varying Ra and P. Three domains of behaviour were found: layered convection for high Ra and more negative P, whole mantle convection for low Ra and less negative P and transitional behaviour in an intervening domain. The boundary between the layered and transitional domain was fit by a curve P = αRaβ where α = −1.05, and β = −0.1, and the fit for the boundary between the transitional and whole mantle convection domain was α = −4.8, and β = −0.25. These two curves converge at Ra≈2.5×104 and P≈−0.38. Extrapolating to high Ra, which is likely earlier in Earth history, this work suggests a large transitional domain. It is therefore likely that convection in the Archean would have been influenced by this phase change, with Earth being at least in the transitional domain, if not the layered domain.

scholarly journals Pressure‐Induced Perovskite‐to‐non‐Perovskite Phase Transition in CsPbBr3

2021 ◽  
Author(s):  
Agnieszka Noculak ◽  
Simon C. Boehme ◽  
Marcel Aebli ◽  
Yevhen Shynkarenko ◽  
Kyle M. McCall ◽  
...  
Keyword(s):  
Phase Transition ◽  
Perovskite Phase

scholarly journals Post-Perovskite Phase Transition in MgSiO3

Science ◽  
2004 ◽  
Vol 304 (5672) ◽  
pp. 855-858 ◽  
Author(s):  
M. Murakami
Keyword(s):  
Phase Transition ◽  
Perovskite Phase

High-pressure behavior of MnGeO3 and CdGeO3 perovskites and the post-perovskite phase transition

2005 ◽  
Vol 32 (10) ◽  
pp. 721-725 ◽  
Author(s):  
Shigehiko Tateno ◽  
Kei Hirose ◽  
Nagayoshi Sata ◽  
Yasuo Ohishi
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Perovskite Phase ◽  
Pressure Behavior
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