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Title: Synthesis, structure and magnetic properties of Ba3M2Ge4O14 (M = Mn and Fe): Quasi-one-dimensional zigzag chain compounds

Journal Article · · Journal of Solid State Chemistry
 [1];  [2];  [3];  [2];  [3];  [3]
  1. Clemson Univ., SC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Clemson University Department of Chemistry
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Clemson Univ., SC (United States)
+ Show Author Affiliations

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.

Research Organization:
Clemson Univ., SC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725; SC0014271
OSTI ID:
1596452
Journal Information:
Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: C Vol. 283; ISSN 0022-4596
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Hydrothermal single crystal
germanate
hydrothermal
magnetic properties
transition metal
transition metal germanates chains