Abstract
Size is the key factor of nanostructured materials, since all the structural, transport, electrical, magnetic and other physical properties can be tuned by this factor of materials. Only the condition is to choose appropriate inexpensive scale-processing method for material synthesis which offers good control over the stoichiometry, morphology and particle size distribution. Present communication deals with the studies on the sol–gel grown Y0.95Ca0.05MnO3 (YCMO) nanostructured compounds for their size-induced tuning of dielectric behavior. Structural studies reveal the single phasic nature with improved crystallite size with sintering temperature. Dielectric constant (real and imaginary) is found to increase with temperature and crystallite size/sintering temperature. High dielectric loss has been observed in the present system. Size dependent activation energy (Ea), obtained from modulus measurement, showing the increase in Ea with crystallite size. The variation in various dielectric parameters and Ea has been discussed in the light of crystallite size, crystallite boundaries, oxygen vacancies and charge carrier hopping.
Highlights
In periodic classification of the elements, there is a group of metals referred to as transition metals which use theirManganese oxide based multiferroics, such as BiMnO3, YMnO3, HoMnO3, TbMnO3, etc., have been recently receiving an attention due to their fundamental physics (Lorenz et al 2004; Aikawa et al 2005; Singh et al 2010) and potential for various spintronic applications (Gajek et al 2007; Li et al 2009), such as read and write heads, field and temperature sensors, spin valves, spin filters, tunnel junctions, p-n junction diodes, non-volatile random access memory devices, etc
Studies from the view point of multiferroicity, Aikawa et al have reported the substitutional effect of Ti4? at Mn-site in YMO and found the structural phase transition and strong magnetodielectric behavior in the series of samples (Aikawa et al 2005) Multiferroicity in doped YMO compounds has been studied using the substitution of nontransition metal/non-magnetic Ga3? at Mn-site (Zhou et al 2005)
XRD measurements were carried out on all the sol–gel grown nanostructured YCMO compounds sintered at various temperatures
Summary
In periodic classification of the elements, there is a group of metals referred to as transition metals which use theirManganese oxide based multiferroics, such as BiMnO3, YMnO3, HoMnO3, TbMnO3, etc., have been recently receiving an attention due to their fundamental physics (Lorenz et al 2004; Aikawa et al 2005; Singh et al 2010) and potential for various spintronic applications (Gajek et al 2007; Li et al 2009), such as read and write heads, field and temperature sensors, spin valves, spin filters, tunnel junctions, p-n junction diodes, non-volatile random access memory devices, etc. Many reports exist on the studies on Mn-site substitution of transition metals in YMO (Gutierrez et al 2002; Moure et al 2002; Veres et al 2006; Aikawa et al 2005).
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