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Title: Reduced radiative conductivity of low spin FeO 6 -octahedra in FeCO 3 at high pressure and temperature

Authors:
ORCiD logo; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1323957
Grant/Contract Number:
FG02-94ER14466
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Earth and Planetary Science Letters
Additional Journal Information:
Journal Volume: 449; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-06 15:00:36; Journal ID: ISSN 0012-821X
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Lobanov, Sergey S., Holtgrewe, Nicholas, and Goncharov, Alexander F. Reduced radiative conductivity of low spin FeO 6 -octahedra in FeCO 3 at high pressure and temperature. Netherlands: N. p., 2016. Web. doi:10.1016/j.epsl.2016.05.028.
Lobanov, Sergey S., Holtgrewe, Nicholas, & Goncharov, Alexander F. Reduced radiative conductivity of low spin FeO 6 -octahedra in FeCO 3 at high pressure and temperature. Netherlands. doi:10.1016/j.epsl.2016.05.028.
Lobanov, Sergey S., Holtgrewe, Nicholas, and Goncharov, Alexander F. Thu . "Reduced radiative conductivity of low spin FeO 6 -octahedra in FeCO 3 at high pressure and temperature". Netherlands. doi:10.1016/j.epsl.2016.05.028.
@article{osti_1323957,
title = {Reduced radiative conductivity of low spin FeO 6 -octahedra in FeCO 3 at high pressure and temperature},
author = {Lobanov, Sergey S. and Holtgrewe, Nicholas and Goncharov, Alexander F.},
abstractNote = {},
doi = {10.1016/j.epsl.2016.05.028},
journal = {Earth and Planetary Science Letters},
number = C,
volume = 449,
place = {Netherlands},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.epsl.2016.05.028

Citation Metrics:
Cited by: 6works
Citation information provided by
Web of Science

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  • Highlights: • (Y,Ca)(Fe,Co)O{sub 3−δ} was prepared via citrate-based route with annealing at 1150–1200 °C. • Y{sub 0.9}Ca{sub 0.1}Fe{sub 0.8}Co{sub 0.2}O{sub 3−δ} demonstrates low thermal expansion coefficient of 11.9 ppm K{sup −1}. • Oxides do not react with YSZ and GDC up to 1000 °C and 1100 °C, respectively. • Compounds demonstrate higher electrical conductivity in comparison with Y{sub 0.9}Ca{sub 0.1}FeO{sub 3}. • Pr-doped (Y,Ca)(Fe,Co)O{sub 3−δ} demonstrate both higher electrical conductivity and TEC. - Abstract: Orthorhombic perovskites Y{sub 1−x}Ca{sub x}Fe{sub 1−y}Co{sub y}O{sub 3−δ} (0.1 ≤ x ≤ 0.2, 0.1 ≤ y ≤ 0.2 and x = 0.1, y = 0.3) weremore » synthesized in air by the citrate route at 1150–1300 °C. High-temperature X-ray powder diffraction (HT XRPD) data for Y{sub 0.9}Ca{sub 0.1}Fe{sub 0.8}Co{sub 0.2}O{sub 3−δ} at 25–800 °C showed no phase transition with calculated thermal expansion coefficient (TEC) of 11.9 ppm K{sup −1}. High-temperature electrical conductivity measurements revealed almost composition independent conductivity values of 22–27 S/cm at 900 °C. No chemical interaction of Y{sub 0.8}Ca{sub 0.2}Fe{sub 0.9}Co{sub 0.1}O{sub 3−δ} with (Zr,Y)O{sub 2−x} (YSZ) or (Ce,Gd)O{sub 2−x} (GDC) was observed up to 1000 °C and 1100 °C, respectively. Partial replacement of Y by Pr according to formula Y{sub 0.8−z}Pr{sub z}Ca{sub 0.2}Fe{sub 0.7}Co{sub 0.3}O{sub 3−δ}, 0.1 ≤ z ≤ 0.35, leads to an increase of both electrical conductivity up to 50 S/cm (z = 0.3) at 900 °C and dilatometry measured TEC up to 15.1 ppm K{sup −1}. Moderate values of electrical conductivity in combination with low TEC and stability towards chemical interaction with typical SOFC electrolytes make Co-doped Y{sub 1−x}Ca{sub x}FeO{sub 3−δ} promissing cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFC)« less
  • Synchrotron-based infrared and Raman spectroscopies were brought together with diamond anvil cell techniques and an analysis of the magnetic properties to investigate the pressure-induced high low spin transition in [Ru2(O2CMe)4]3[Cr(CN)6]. The extended nature of the diruthenium wavefunction combined with coupling to chromium-related local lattice distortions changes the relative energies of the and orbitals and drives the high low spin transition on the mixed-valence diruthenium complex. This is a rare example of an externally controlled metamagnetic transition in which both spin-orbit and spin-lattice interactions contribute to the mechanism.
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