Synthesis of nanocrystalline giant dielectric constant Gd<inf>2</inf>CuO<inf>4</inf> ceramic by Pechini process

Abstract

Phase pure (T'-type, sp. gpo I4/mmm), category of materials to be explored fully for their dielectric nanocrystalline Gd2Cu04 powders were synthesized by a wetproperties. However, the observed high £/ was contested to be chemical citrate gel complexation process known as "Pechini process". The T'-type phase was realized at much lower (_ 1073 mostly intrinsic in nature and extrinsic factors affecting £/ K) temperature than those reported for conventional ceramic were not studied. Further, these few select compounds studied powder mixing and solid state reaction process (_ 1223 K). The so far were synthesized using standard ceramic powder average particle size of the solid state reacted particles from HRmixing and solid state reaction process, which requires high TEM was found to be -50 nm. The dielectric studies on the synthesis temperatures and often encountered with Gd2Cu04 pellets revealed extremely high values of E/ (�10 4 ) inhomogeneity of constituent ions. In contrast, wet chemical over the measure frequencies (1 <5. f <5. 1 MHz) and temperature synthesis process facilitates the molecular level mixing of (173 K <5. T<5. 423 K) ranges. Being non-ferroelectric, we propose constituent elements, which in turn contribute towards such high values of E/ arise due to an Internal barrier layer maintaining better stoichiometry and lower synthesis capacitance effect, formed by insulating grain boundaries and semiconducting grains in the ceramics. temperatures [7]. However, there have been a very few reports