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Article
Affiliation(s)

1. Institute of Materials Research, National Autonomous University of Mexico, Mexico City 04510, Mexico
2. Faculty of Chemistry, National Autonomous University of Mexico, Mexico City 04510, Mexico
3. Institute of Physics, National Autonomous University of Mexico, Mexico City 04510, Mexico

ABSTRACT

Studies of thermodynamic, electric and magnetic properties were conducted on the (KxSr1-x)CrOz, x = 0.10, 0.15 and 0.50 system; adjusted for different crystal sizes (polycrystalline, nano-crystalline and single crystals). For polycrystals, a solid-state reaction method was used (room temperature, TR, up to 665 °C). Nano-crystals, a crushing technique with a mechanical mortar were processed at TR. Single crystals were acquired, through fusion method starting from polycrystals pre-manufactured (665 °C) over 900 °C. For the methods described above, they all were worked at atmospheric pressure. Studying the thermodynamic in the crystals mixture were obtained by TGA (thermogravimetric analysis) and DSC (differential scanning calorimetry). Powder XRD (X-ray diffraction) in the manual grinding mixture a SrCO3 solid solution, at TR was detected. When increasing the temperature, a solid solution of K2Sr(CrO4)2 is formed. By HRTEM (high-resolution transmission electronic microscope), crystal sizes 4-12 nm were seen. (K0.50Sr0.50)CrOz composition presents a weak ferromagnetic and an insulating behavior.

KEYWORDS

Solid-state reaction, solid solutions, TGA-DSC, XRD, HRTEM, magnetic behavior.

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