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Structural and magnetic properties on F-doped LiVO2 with two-dimensional triangular lattice

Published online by Cambridge University Press:  30 August 2011

Yang Li ,
Xiaoxiang Li ,
Lihua Liu ,
Ning Chen ,
Jose García ,
Rafael Dávila ,
Danny Faica ,
Alfred Rivera ,
Pedro Rodríguez  and
Rubén Pérez
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Yang Li*
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A. Department of physics, University of Science and Technology Beijing, Beijing 100083, China
Xiaoxiang Li
Affiliation:
Department of physics, University of Science and Technology Beijing, Beijing 100083, China
Lihua Liu
Affiliation:
Department of physics, University of Science and Technology Beijing, Beijing 100083, China
Ning Chen
Affiliation:
School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jose García
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Rafael Dávila
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Danny Faica
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Alfred Rivera
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Pedro Rodríguez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Rubén Pérez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681-9044, U.S.A.
Guohui Cao
Affiliation:
Department of physics, University of Science and Technology Beijing, Beijing 100083, China
*
*Corresponding author: YL electronic mail: ylibp@hotmail.com
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Abstract

The layered oxide LiVO2 recently has received more attention due to its interesting structural and magnetic behaviors involving the two-dimensional magnetic frustration in these systems. We synthesized a series of F-doped LiVO2 samples, and reported the F-doping effect on the structure and transition temperature Tt. The samples LiVO2-xFx (x=0, 0.1, 0.2 and 0.3) were characterized by X-ray diffraction, scanning electron microscope (SEM), differential scanning calorimetry (DSC), magnetic susceptibility and specific heat measurement. The structural analysis shows that with increasing x, the ratio of lattice parameter c/a increasing, i.e. in the a-b plane the lattice is compressed while in the c-axis direction the lattice expands. The DSC measurements show that a first-order phase transition happens at around 500 K, and the thermal hysteresis around phase transition temperature Tt increases with increasing x. Substitution of O with F ions results in a change of two dimensional characteristics and the distortion of the VO6 block in structure, which significantly influence the magnetic ordering transition temperature Tt.

Keywords

structuralmagnetic propertiesphase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1344: Symposium Y – Functional Two-Dimensional Layered Materials—From Graphene to Topological Insulators , 2011 , mrss11-1344-y03-20
Copyright
Copyright © Materials Research Society 2011

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References

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