Hydrothermally controlled growth and magnetic properties of multi-morphology manganese oxide (RMnO3, R=Ca, Sr, Ba) nano- and microcrystals

• Published in: Journal of crystal growth Vol. 380; pp. 163 - 168
• Main Authors: Zhang, Jinhua, Yu, Dabin, Du, Kai, Wang, Feng, Zhao, Dapeng, Wang, Yong, Chen, Leilei, Kong, Mingguang, Zou, Jiwei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2013; Elsevier
• Subjects: A1. Crystal structure; A1. Nanostructures; Applied sciences; B1. Oxides; B2. Magnetic materials; Cross-disciplinary physics: materials science; rheology; Electronics; Exact sciences and technology; Magnetic properties; Materials science; Methods of crystal growth; physics of crystal growth; Nanoscale materials and structures: fabrication and characterization; Optoelectronic devices; Other topics in nanoscale materials and structures; Physics; Quantum wires; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation; B1. Oxides; A1. Crystal structure; A1. Nanostructures; B2. Magnetic materials; Temperature dependence; Magnetization; Ferromagnetic materials; Light emitting diodes; Nanostructures; Positive ions; Magnetic measurement; Manganese oxides; Hydrothermal synthesis; Morphology; Growth mechanism; Bromides; Magnetic materials; Nanowires; Microcrystal; Nanostructured materials; Nanocrystal; Magnetic properties; Crystal structure
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2013.06.008

This paper presents a general hydrothermal route to multi-morphology manganese oxide (RMnO3, R=Ca, Sr, Ba) nano- and microcrystals and reports the magnetic properties of their nanowires as well. Adjustment of the synthesis conditions, particularly the change of the concentrations of n-hexadecyltrimethylammonium bromide and NaOH, led to the formation of nano- and microcrystals with wire-, belt-, pyramid-, flower-, and arrow-like morphologies. Considering the shape-dependent magnetic properties of nanocrystals, nanowires were selected as representative samples for magnetic measurements. At low temperature, the nanowires exhibited interesting competing ferromagnetic–antiferromagnetic interactions, and the magnetization values increase significantly with increasing the radius of positive ions from Ca2+ to Ba2+. •A general hydrothermal route was developed to multi-morphology manganese oxides nano- and microcrystals.•Some crystals show well-defined crystallographical structure and novel shapes.•The nanowires exhibited an interesting competing ferromagnetic–antiferromagnetic interaction behavior at low temperature.