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Title: MnBi 2 : A Metastable High-Pressure Phase in the Mn–Bi System

Abstract

Interacting heavy main group elements that are laden with spin–orbit coupling with transition metals, such as manganese, is a potential route toward the synthesis of new permanent magnets. In theory, this approach can be used to design magnets with large magnetic energy products by maximizing both coercive field and remnant magnetization. Powerful precedent for this approach resides in the intermetallic compound, MnBi, which was for a short time in the 1950’s the most powerful magnetic material in the world. Creating new materials within this phase space is enabled by high-pressure synthesis, which is facilitated by recent advances in in situ techniques within diamond anvil cells. We observed the Mn–Bi system under high pressure in search of novel intermetallic compounds, and herein we report the discovery of MnBi 2, a novel intermetallic in the Mn–Bi system. This compound forms above 8.3(1) GPa, crystallizing in the Al 2Cu structure-type with a = 6.8315(1) Å and c = 5.6572(2) Å. This discovery hints at the possibility of further compounds within this underexplored phase space.

Authors:
 [1];  [2];  [1];  [1];  [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; US Army Research Office (ARO)
OSTI Identifier:
1530676
Report Number(s):
LLNL-JRNL-758840
Journal ID: ISSN 0897-4756; 946905
Grant/Contract Number:  
AC52-07NA27344; SC0018092; AC02- 06CH11357; FA9550-14-1-0358; FA9550-17-1-0247; W911NF-15-1-0017
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 31; Journal Issue: 9; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Walsh, James P. S., Clarke, Samantha M., Puggioni, Danilo, Tamerius, Alexandra D., Meng, Yue, Rondinelli, James M., Jacobsen, Steven D., and Freedman, Danna E. MnBi 2 : A Metastable High-Pressure Phase in the Mn–Bi System. United States: N. p., 2019. Web. doi:10.1021/acs.chemmater.9b00385.
Walsh, James P. S., Clarke, Samantha M., Puggioni, Danilo, Tamerius, Alexandra D., Meng, Yue, Rondinelli, James M., Jacobsen, Steven D., & Freedman, Danna E. MnBi 2 : A Metastable High-Pressure Phase in the Mn–Bi System. United States. doi:10.1021/acs.chemmater.9b00385.
Walsh, James P. S., Clarke, Samantha M., Puggioni, Danilo, Tamerius, Alexandra D., Meng, Yue, Rondinelli, James M., Jacobsen, Steven D., and Freedman, Danna E. Wed . "MnBi 2 : A Metastable High-Pressure Phase in the Mn–Bi System". United States. doi:10.1021/acs.chemmater.9b00385.
@article{osti_1530676,
title = {MnBi 2 : A Metastable High-Pressure Phase in the Mn–Bi System},
author = {Walsh, James P. S. and Clarke, Samantha M. and Puggioni, Danilo and Tamerius, Alexandra D. and Meng, Yue and Rondinelli, James M. and Jacobsen, Steven D. and Freedman, Danna E.},
abstractNote = {Interacting heavy main group elements that are laden with spin–orbit coupling with transition metals, such as manganese, is a potential route toward the synthesis of new permanent magnets. In theory, this approach can be used to design magnets with large magnetic energy products by maximizing both coercive field and remnant magnetization. Powerful precedent for this approach resides in the intermetallic compound, MnBi, which was for a short time in the 1950’s the most powerful magnetic material in the world. Creating new materials within this phase space is enabled by high-pressure synthesis, which is facilitated by recent advances in in situ techniques within diamond anvil cells. We observed the Mn–Bi system under high pressure in search of novel intermetallic compounds, and herein we report the discovery of MnBi2, a novel intermetallic in the Mn–Bi system. This compound forms above 8.3(1) GPa, crystallizing in the Al2Cu structure-type with a = 6.8315(1) Å and c = 5.6572(2) Å. This discovery hints at the possibility of further compounds within this underexplored phase space.},
doi = {10.1021/acs.chemmater.9b00385},
journal = {Chemistry of Materials},
number = 9,
volume = 31,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 24, 2020
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