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Nanostructured La(Sr)CrO3 through gel combustion: sintering and electrical behavior.

Sathi R Nair¹, R D Purohit, P K Sinha

¹Energy Conversion Materials Section, Bhabha Atomic Research Centre, Vashi Complex, Navi Mumbai 400705, India.

Journal of Nanoscience and Nanotechnology

|August 10, 2007

Summary

Researchers developed a cost-effective method for producing nanostructured lanthanum strontium chromite (La(Sr)CrO3) powders. This new process achieves a low sintering temperature, enabling bulk preparation of this important material for various applications.

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Area of Science:

Materials Science
Solid-State Chemistry
Ceramic Engineering

Background:

Lanthanum Strontium Chromite (La(Sr)CrO3) is a promising material for high-temperature applications.
Previous synthesis methods for La(Sr)CrO3 often require high temperatures and expensive precursors.
Efficient bulk preparation of sinter-active La(Sr)CrO3 powders is crucial for industrial scalability.

Purpose of the Study:

To develop a cost-effective and scalable method for preparing nanostructured La(Sr)CrO3 powders.
To investigate the use of chromium trioxide (CrO3) as an inexpensive chromium source.
To determine the optimal conditions for achieving high density and good conductivity in sintered La(Sr)CrO3.

Main Methods:

Glycine-nitrate gel combustion synthesis was employed for powder preparation.

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Calcination at 700°C to form the La(Sr)CrO3 phase.

Cold pressing and sintering at 1450°C to achieve dense ceramic bodies.

Main Results:

Successfully prepared nanostructured La(Sr)CrO3 powders using inexpensive CrO3.
Achieved a mono-phasic La0.8Sr0.2CrO3 with 94% theoretical density at a record low sintering temperature of 1450°C.
The sintered material exhibited a conductivity of approximately 18 S cm⁻¹ at 1000°C.

Conclusions:

The glycine-nitrate gel combustion method using CrO3 is a viable route for bulk production of sinter-active La(Sr)CrO3.
The achieved low sintering temperature significantly reduces processing costs and energy consumption.
The resulting La0.8Sr0.2CrO3 material demonstrates good densification and electrical conductivity, suitable for high-temperature applications.