Functional Transition Metal Perovskite Oxides with 6s2 Lone Pair Activity Stabilized by High-Pressure Synthesis

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Masaki Azuma ◽  
Hajime Hojo ◽  
Kengo Oka ◽  
Hajime Yamamoto ◽  
Keisuke Shimizu ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Transition Metals ◽  
Lone Pair ◽  
Degree Of Freedom ◽  
Publication Date ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
Charge Degree ◽  
Charge Degree Of Freedom

Perovskite ABO3 oxides that have Bi and Pb at the A site and transition metals at the B site, when stabilized by high-pressure synthesis at several gigapascals, provide a rich parameter space of fascinating properties. Stereochemical 6 s2 lone pairs of Bi3+ and Pb2+ induce polar or antipolar distortions. 6 s2 and 6 s0 (Bi5+ and Pb4+) charge degree of freedom enable intermetallic charge transfer transitions. The structural distortion and the charge degree of freedom are coupled with magnetism of transition metals, resulting in various functionalities. In particular, we highlight magnetization reversal by electric field and polarization rotation in BiFe1− xCo xO3, negative thermal expansion in modified BiNiO3 and PbVO3, and systematic charge distribution changes in Pb MO3 ( M = 3 d transition metal). Expected final online publication date for the Annual Review of Materials Science, Volume 51 is August 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals High-pressure synthesis and physical properties of A-site ordered perovskites

2014 ◽  
Vol 70 (a1) ◽  
pp. C755-C755
Author(s):  
Youwen Long
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Physical Properties ◽  
Colossal Magnetoresistance ◽  
Research Work ◽  
Negative Thermal Expansion ◽  
Transition Metal Ions ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
A Site

ABO3-type perovskite oxides exhibit a wide variety of interesting physical properties such as superconductivity, colossal magnetoresistance, multiferroic behavior etc. For a simple ABO3 perovskite, if three quarters of the A site is replaced by a transition metal A', then the so-called A-site ordered double perovskite with the chemical formula of AA'3B4O12 can form. Since both A' and B sites accommodate transition metal ions, in addition to conventional B-B interaction, the new A'-A' and/or A'-B interaction is possible to show up, giving rise to the presence of many novel physical properties. Here we will show our recent research work on the high-pressure synthesis of several A-site ordered perovskites as well as a series of interesting physical properties like temperature- and pressure-induced intermetallic charge transfer, negative thermal expansion, magnetoelectric coupling multiferroic and so on. [1-3]

scholarly journals Spin structures and band gap reduction of high-pressure triple perovskite Mn3MnTa2O9

2021 ◽  
Author(s):  
Elena Solana-Madruga ◽  
Clemens Ritter ◽  
Olivier Mentré ◽  
Ángel M. Arévalo-López
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Band Gap ◽  
Magnetic Structure ◽  
Perovskite Structure ◽  
Spin Structures ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

The transition-metal-only Mn3MnTa2O9 triple perovskite structure with 1 : 2 B-site order has been prepared by high pressure synthesis. It shows a complex modulated magnetic structure and a 25% band gap reduction from its room pressure polymorph.

Mixed-cation transition metal pyrite dichalcogenides—High pressure synthesis and properties

1970 ◽  
Vol 1 (3-4) ◽  
pp. 526-533 ◽  
Author(s):  
T.A. Bither ◽  
P.C. Donohue ◽  
W.H. Cloud ◽  
P.E. Bierstedt ◽  
H.S. Young
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
High Pressure Synthesis ◽  
Mixed Cation ◽  
Pressure Synthesis

Transition metal pyrite dichalcogenides. High-pressure synthesis and correlation of properties

1968 ◽  
Vol 7 (11) ◽  
pp. 2208-2220 ◽  
Author(s):  
Tom A. Bither ◽  
R. J. Bouchard ◽  
W. H. Cloud ◽  
P. C. Donohue ◽  
W. J. Siemons
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

High pressure synthesis of transition metal carbonyls

1979 ◽  
Vol 56 (7) ◽  
pp. 479 ◽  
Author(s):  
A. P. Hagen ◽  
T. S. Miller ◽  
D. L. Terrell ◽  
B. Hutchinson ◽  
R. L. Hance ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Metal Carbonyls ◽  
High Pressure Synthesis ◽  
Transition Metal Carbonyls ◽  
Pressure Synthesis

scholarly journals Na3FeH7 and Na3CoH6: Hydrogen-Rich First-Row Transition Metal Hydrides from High Pressure Synthesis

2020 ◽  
Vol 59 (22) ◽  
pp. 16467-16473
Author(s):  
Kristina Spektor ◽  
Wilson A. Crichton ◽  
Stanislav Filippov ◽  
Sergei I. Simak ◽  
Andreas Fischer ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Metal Hydrides ◽  
High Pressure Synthesis ◽  
Transition Metal Hydrides ◽  
Pressure Synthesis
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