scholarly journals The high-pressure electronic spin transition in iron: Potential impacts upon mantle mixing

2011 ◽  
Vol 116 (B8) ◽  
Author(s):  
M. H. Shahnas ◽  
W. R. Peltier ◽  
Z. Wu ◽  
R. Wentzcovitch
Keyword(s):  
High Pressure ◽  
Spin Transition ◽  
Electronic Spin

scholarly journals Phase Stability and Vibrational Properties of Iron-Bearing Carbonates at High Pressure

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1142
Author(s):  
Chaoshuai Zhao ◽  
Liangxu Xu ◽  
Weibin Gui ◽  
Jin Liu
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Spin Transition ◽  
Laser Raman ◽  
Electronic Spin ◽  
Pressure Medium ◽  
Raman Modes ◽  
Sample Chamber ◽  
The Stability ◽  
Iron Bearing

The spin transition of iron can greatly affect the stability and various physical properties of iron-bearing carbonates at high pressure. Here, we reported laser Raman measurements on iron-bearing dolomite and siderite at high pressure and room temperature. Raman modes of siderite FeCO3 were investigated up to 75 GPa in the helium (He) pressure medium and up to 82 GPa in the NaCl pressure medium, respectively. We found that the electronic spin-paring transition of iron in siderite occurred sharply at 42–44 GPa, consistent with that in the neon (Ne) pressure medium in our previous study. This indicated that the improved hydrostaticity from Ne to He had minimal effects on the spin transition pressure. Remarkably, the spin crossover of siderite was broadened to 38–48 GPa in the NaCl pressure medium, due to the large deviatoric stress in the sample chamber. In addition, Raman modes of iron-bearing dolomite Ca1.02Mg0.76Fe0.20Mn0.02(CO3)2 were explored up to 58 GPa by using argon as a pressure medium. The sample underwent phase transitions from dolomite-Ⅰ to -Ⅰb phase at ~8 GPa, and then to -Ⅱ at ~15 and -Ⅲb phase at 36 GPa, while no spin transition was observed in iron-bearing dolomite up to 58 GPa. The incorporation of FeCO3 by 20 mol% appeared to marginally decrease the onset pressures of the three phase transitions aforementioned for pure dolomite. At 55–58 GPa, the ν1 mode shifted to a lower frequency at ~1186 cm−1, which was likely associated with the 3 + 1 coordination in dolomite-Ⅲb. These results shed new insights into the nature of iron-bearing carbonates at high pressure.

High-pressure phase transitions of Fe3-xTixO4 solid solution up to 60 GPa correlated with electronic spin transition

2013 ◽  
Vol 98 (4) ◽  
pp. 736-744 ◽  
Author(s):  
T. Yamanaka ◽  
A. Kyono ◽  
Y. Nakamoto ◽  
Y. Meng ◽  
S. Kharlamova ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Phase Transitions ◽  
Spin Transition ◽  
High Pressure Phase ◽  
Electronic Spin ◽  
Pressure Phase

scholarly journals [Fe(abpt)2(NCSe)2] polymorph A: structural studies into the spin crossover behaviour

2018 ◽  
Vol 42 (22) ◽  
pp. 18028-18037 ◽  
Author(s):  
Helen E. Mason ◽  
Michelle L. Hamilton ◽  
Judith A. K. Howard ◽  
Hazel A. Sparkes
Keyword(s):  
High Pressure ◽  
Spin Crossover ◽  
Spin Transition ◽  
Structural Studies

Crystallographic and UV-Vis analysis of the thermal spin-transition in [Fe(abpt)2(NCSe)2], polymorph A, is presented alongside LIESST and high pressure structures.

scholarly journals Electronic spin transition in FeO2 : Evidence for Fe(II) with peroxide O22−

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
Bo Gyu Jang ◽  
Jin Liu ◽  
Qingyang Hu ◽  
Kristjan Haule ◽  
Ho-Kwang Mao ◽  
...  
Keyword(s):  
Spin Transition ◽  
Electronic Spin

scholarly journals High pressure generation and investigation of the spin transition of ferropericlase (Mg0.83Fe0.17)O

2010 ◽  
Vol 215 ◽  
pp. 012099 ◽  
Author(s):  
E Ito ◽  
T Yoshino ◽  
D Yamazaki ◽  
A S Shatskiy ◽  
S Shan ◽  
...  
Keyword(s):  
High Pressure ◽  
Spin Transition

Deformation of lower-mantle ferropericlase (Mg,Fe)O across the electronic spin transition

2009 ◽  
Vol 36 (10) ◽  
pp. 585-592 ◽  
Author(s):  
Jung-Fu Lin ◽  
Hans-Rudolf Wenk ◽  
Marco Voltolini ◽  
Sergio Speziale ◽  
Jinfu Shu ◽  
...  
Keyword(s):  
Lower Mantle ◽  
Spin Transition ◽  
Electronic Spin

scholarly journals Electronic Spin Transition of Iron in the Earth's Deep Mantle

Eos ◽  
2007 ◽  
Vol 88 (2) ◽  
pp. 13 ◽  
Author(s):  
Jung-Fu Lin ◽  
Steven D. Jacobsen ◽  
Renata M. Wentzcovitch
Keyword(s):  
Spin Transition ◽  
Electronic Spin ◽  
Deep Mantle
Sign in / Sign up

Export Citation Format

Share Document