Abstract
A series of trivalent transition metal germanates with a general formula of A3M2Ge4O14 (A = Sr, Ba, M = Mn and Fe) was synthesized using a high-temperature (580 °C) hydrothermal technique. Compound I, Ba3Mn2Ge4O14, is a new structure type that is characterized by one-dimensional Mn–O–Mn chains made from edge-sharing highly distorted Mn3+O6 units, and exhibits antiferromagnetic behavior below 15 K with field induced metamagnetic transitions. The A3Fe2Ge4O14 (A = Sr and Ba, II and III, respectively) series belongs to the well-known langasite structure type, crystallizing in space group P321. In A3Fe2Ge4O14, there is one octahedral Fe3+ site and one mixed-occupancy Fe3+/Ge4+ site that form the one-dimensional substructure. The magnetic susceptibility data of Ba3Fe2Ge4O14 reveals a much simpler magnetic structure with an antiferromagnetic transition near 5.5 K. The Jahn-Teller distortion of Mn3+ appears to be influential in the phase formation, leading to significantly different structures for these Mn3+ and Fe3+ compounds with similar chemical formulas.
Original language | English |
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Article number | 121090 |
Journal | Journal of Solid State Chemistry |
Volume | 283 |
DOIs | |
State | Published - Mar 2020 |
Funding
The research is supported by the DOE, Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division . Work performed at Clemson University was funded by DOE BES Grant No. DE-SC0014271 . The research is partly supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division . Appendix A The research is supported by the DOE, Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division. Work performed at Clemson University was funded by DOE BES Grant No. DE-SC0014271. The research is partly supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Science and Engineering Division.
Keywords
- Germanate
- Hydrothermal
- Magnetic properties
- Transition metal