Magneto-thermal and dielectric properties of biferroic YCrO{sub 3} prepared by combustion synthesis

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.06.001· OSTI ID:21421586

Duran, A ^[1]; Arevalo-Lopez, A M; Castillo-Martinez, E ^[2]; Garcia-Guaderrama, M ^[3]; Moran, E ^[2]; Cruz, M P ^[1]; Fernandez, F ^[4]; Alario-Franco, M A ^[2]

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1. Universidad Nacional Autonoma de Mexico, Centro de Nanociencias y Nanotecnologia, Apartado Postal 2681, C.P. 22800, Ensenada, B.C. (Mexico)
2. Departamento de Quimica Inorganica y Laboratorio Complutense de Altas Presiones, Facultad de Quimica, Universidad Complutense de Madrid, E.U., 28040 Madrid (Spain)
3. Centro de Investigacion en Materiales DIP-CUCEI, Universidad de Guadalajara. Av. Revolucion 1500, Col. Olimpica, Guadalajara (Mexico)
4. Universidad Politecnica de Madrid, E.U. Ingenieria Tecnica Industrial, Ronda de Valencia, 3, E-28012 Madrid (Spain)

Microstructural, magnetothermal and dielectric properties of YCrO{sub 3} powders prepared by combustion and solid state methods have been studied by a combination of XRD, specific heat, magnetization and permittivity measurements. The TEM and XRD characterization confirm that the combustion powders are amorphous plate-like agglomerates of nano-sized crystalline particles. A more uniform grain size along with an increase of the relative density is observed by SEM in the sintered samples prepared by combustion route with respect to those produced by solid state reaction. Similar to the material obtained through solid state synthesis, the material prepared by the combustion method also shows spin canted antiferromagnetic ordering of Cr{sup +3} (S=3/2) at {approx}140 K, which is shown by magnetization as well as {lambda}-type anomaly in the total specific heat. Furthermore, the magnetic contribution to the total specific heat reveals spin fluctuations above T{sub N} and a spin reorientation transition at about 60 K. Both YCrO{sub 3} compounds show a diffuse phase transition at about 450 K, typical of a relaxor ferroelectric, which is characterized by a broad peak in the real part of the dielectric permittivity as a function of temperature, with the peak decreasing in magnitude and shifting to higher temperature as the frequency increases. The relaxor dipoles are due to the local non-centrosymmetric structure. Furthermore, the high loss tangent in a broad range of temperature as well as conductivity analysis indicates a hopping mechanism for the electronic conductivity as we believe it is a consequence of the outer d{sup 3}-shell, which have detrimental effects on the polarization and the pooling process in the YCrO{sub 3} bulk material. The more uniform particle size and higher density material synthesized through the combustion process leads to an improvement in the dielectric Properties. - Graphical abstract: Combustion method: An alternative route for synthesized a new family of multiferroics. Amorphous agglomerates of nano-sized particles of YCrO{sub 3} compounds.

• OSTI ID: 21421586
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 8; Other Information: DOI: 10.1016/j.jssc.2010.06.001; PII: S0022-4596(10)00242-2; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ANTIFERROMAGNETISM
CHROMATES
CHROMIUM IONS
COMBUSTION
DIPOLES
GRAIN SIZE
MAGNETIZATION
NANOSTRUCTURES
PERMITTIVITY
PHASE TRANSFORMATIONS
SCANNING ELECTRON MICROSCOPY
SPECIFIC HEAT
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0400-1000 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COHERENT SCATTERING
DIELECTRIC PROPERTIES
DIFFRACTION
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
IONS
MAGNETISM
MICROSCOPY
MICROSTRUCTURE
MULTIPOLES
OXIDATION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SIZE
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS