Effect of Sintering on Structural and Transport Properties on Nanosized Pr_0.85Na_0.15MnO₃

Abstract:

We have investigated the structural, microstructure and electrical transport properties of nanosized Pr_0.85Na_0.15MnO₃ (PNMO) synthesized by sol-gel technique and sinter from 600°C to 1000°C. The grain size increases from 67 nm (S600) up to 284 nm (S1000) due to the grain growth during heat treatment. XRD showed that single phase orthorhombic crystal structure of PNMO is fully forms started at 600°C. The resistivity decreased with the increased of grain size and crystallite size due to the reduction of grain boundary effect (dead magnetic layer) which improved their grain conductivity.All samples showed semiconductor behavior where their metal insulator transition temperatures (T_MIT) were estimated to be lower than 80K.

• Periodical: Advanced Materials Research (Volume 1107)
• Pages: 272-277
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1107.272
• Online since: June 2015
• Authors: Siau Wei Ng, Lim Kean Pah*, S.A. Halim, Hassan Jumiah, Albert H.M. Gan, Hui Wei Chin, Kuen Hou Cheong
• Keywords: Colossal Magnetoresistance, Nanosized, Sintering Temperature, Sol-Gel

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