The manganites A_1-xA'_xMnO₃ with A a rare-earth metal and A' an alkali-earth metal are materials of great importance owing to their magnetic and electronic properties, particularly the phenomenon of colossal magneto resistance, whereby a decrease in resistivity of several orders of magnitude is seen on application of magnetic field close to the Curie temperature of the material. The manganites have also been studied as oxidation catalysts and as cathodes in solid-oxide fuel cells, and their potential application in electronic devices are highly dependent upon their atomic structures.

The synthesis of these class of perovskites is a challenge since control of manganese oxidation state. Main preparation methods of these compounds consist on solid state reaction and also sol-gel route, which require drastic or complex conditions. Hydrothermal method in combination of microwave technology is a advantageous tool for the efficient obtainment of inorganic compounds like manganites.

In this work attempts to prepare strontium-doped lanthanum manganites La_1-xSr_xMnO₃ using microwave-assisted hydrothermal synthesis are performed starting from a mixture of lanthanum nitrate, strontium nitrate, manganese(II)nitrate, potassium permanganate and potassium hydroxide as mineralizer. For x = 0.5 the relative perovskite is obtained not pure. While with x = 1 for the first time hexagonal strontium manganite is prepared as tablet shaped crystallites with narrow particle size distribution (ca. 6 mm) at 210°C in 1 hour treatment. Convetional hydrothermal synthetic routes required at least 24 hrs treatment time.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/7761 must be provided.

1. Microwave sintering of nanosctructured metallic powders
2. Characterization of nanopowders
3. Microwave technique applied on the hydrothermal synthesis and sintering of calcia stabilized zirconia nanoparticles
4. Microwave technique applied on the hydrothermal synthesis and sintering of calcia stabilized zirconia nanoparticles
5. A method for procedural standardisation for preparing and processing nanopowders using microwaves
6. Conventional thermal process versus microwave hydrothermal accelerated synthesis route of lanthanum manganites perovskites used in methane combustion
7. Ultrasonic and Microwave Assisted Synthesis of Nanometric Particles
8. Investigations of phase composition and grain size distribution in Pr doped ZrO2
9. Grain Size and Grain Size Distribution of Nanocrystalline Pr-doped Zirconia Powders Obtained in High Pressure Microwave Reactor
10. Measuring the Grain Size Distribution of Pr-doped Zirconia Nanopowders obtained by Microwave Driven Hydrothermal Synthesis
11. Microwave driven hydrothermal synthesis of Pr-doped zirconia nanopowders