Synthesis, characterization of NdCoO3 perovskite and its uses as humidity sensor

The perovskite NdCoO 3 nanoparticles were prepared by the citrate auto combustion method. The synthesized powders were characterized by XRD, HRTEM, EDAX, and AFM analyses. The XRD pattern of NdCoO 3 confirms the orthorhombic perovskite structure with an average crystallite size of 14.46 nm. The EDAX...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2019-12, Vol.125 (12), p.1-9, Article 883
Main Authors: Ateia, Ebtesam E., Arman, M. M., Morsy, M.
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Chemical reactions
Condensed Matter Physics
Crystallites
Ferroelectric materials
Ferroelectricity
Humidity
Hysteresis
Low temperature
Machines
Magnetic properties
Manufacturing
Materials science
Nanoparticles
Nanotechnology
Optical and Electronic Materials
Organic chemistry
Pattern analysis
Perovskite structure
Perovskites
Physics
Physics and Astronomy
Processes
Recovery time
Room temperature
Sensors
Surfaces and Interfaces
Temperature
Thin Films
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Summary:The perovskite NdCoO 3 nanoparticles were prepared by the citrate auto combustion method. The synthesized powders were characterized by XRD, HRTEM, EDAX, and AFM analyses. The XRD pattern of NdCoO 3 confirms the orthorhombic perovskite structure with an average crystallite size of 14.46 nm. The EDAX data indicate that the precursors have fully undergone the chemical reaction to form the predictable composition of the investigated sample. The magnetic hysteresis properties were carried out at room temperature and 100 K. At low temperature, the coericivity of the investigated samples is approximately equal to 22.644 G which is approximately 2.5 greater than its value at room temperature. The investigated sample shows paramagnetic behavior at both temperatures. This behavior can be attributed to the change of electron configurations and ligand field states. The ferroelectric nature was identified by taking the P–E loops at various applied voltages. The spin state of cobalt ions plays an important role in the magnetic properties and humidity-sensing behavior. The humidity-sensing behavior of the prepared sample was studied in a wide range of working humidity (11–97% RH) and testing frequency (100 Hz–100 kHz). The proposed humidity sensor was evaluated in terms of hysteresis, repeatability, and recovery time. Based on the obtained data the optimum testing frequency was chosen to be 100 Hz. The proposed sensor shows a very fast response of 3 s for low humidity. The humidity sensor exhibits good sensitivity over a middle RH range (11–43%).
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-019-3168-6