Nanosized perovskite oxide ^NdFeO ₃ as material for a carbon-monoxide catalytic gas sensor

Abstract

In this paper, research on a CO catalytic gas sensor based on nano-crystalline perovskite oxide NdFeO 3 designed for exhaust gas measurement is presented. Nano-crystalline oxide NdFeO 3 was synthesized by a sol–gel citrate technique. The gas sensing characteristics of this sensor were investigated in the concentration range of CO between 0 and 5 vol.% in air. The influences of C 3 H 8, C 4 H 16 gases, relative humidity and air-flow rate on the cross-sensitivity of the CO sensor were also studied.

Dielectric relaxation of PrFeO3 nanoparticles

“…The solid lines in the Fig. 8 show the best fit of the experimental data to the equation (5). The fitting parameters are listed in Table 5.…”

“…In recent years the rare-earth orthoferrites, having perovskite structure of general formula RFeO 3 (R ¼ rare earth and Y) have been investigated for their usefulness in a wide variety of applications such as in solid-oxide fuel cells [3], gas sensors [4,5], photocatalysis, vehicle catalytic converters [6e8] and magnetic resonance imaging in biomedicine [9]. The RFeO 3 series have the distorted orthorhombic structure with space group Pnma [10].…”

Synthesis and characterization of nano-structured perovskite type neodymium orthoferrite NdFeO3

“…1 These issues have emerged in the context of the development of nanotechnologies for manufacturing nanopowders, nanocomposites, and other nanomaterials for structural and functional applications. 2 The rare-earth orthoferrites, having perovskite structure of general formula RFeO3 (where R is a rare-earth ion) have attracted much interest due to their novel magnetic 3 and magneto-optic 4 properties and are still the subject of much research aimed at a better understanding of properties of the magnetic subsystems and how interactions between them depend on external parameters, such as temperature, field, pressure, etc.. 3,4 Among them, NdFeO3 is known to be orthorhombically distorted perovskite structure. 5 These oxides have potential for various applications such as catalysts, 6 gas separators, solid oxide fuel cells (SOFCs) 7 sensor and magneto-optic materials.…”

“…5 These oxides have potential for various applications such as catalysts, 6 gas separators, solid oxide fuel cells (SOFCs) 7 sensor and magneto-optic materials. 8 The preparation of NdFeO3 and related compounds has been achieved by many methods, including a 24 high temperature ceramic method, hydrothermal synthesis, 9 combustion synthesis, 10 sol-gel, 2 and precipitation. 11 Nano-structured materials have been prepared by a variety of synthetic methods, including gas phase techniques, liquid phase methods, and mixed phase approaches.…”

Magnetic and dielectric properties of orthoferrites La1−x PrxFeO3 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5)

“…The rare-earth orthoferrites (RFeO 3 , R ¼ rare earth elements or Y) [1,2] have been extensively studied for their physical properties and potential applications such as in solid-oxide fuel cells [3], gas sensors [4,5], photo-catalysis and vehicle catalytic converters [6]. They have also been used in data storage device due to their antiferromagnetic properties with N eel temperature ranging from 620 K to 740 K [7].…”