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X-ray photoelectron spectroscopy (XPS) study of Heusler alloy (Co2FeAl) interfaced with semiconductor (n-Si) structure

100%

Kumar A. , Srivastava P. C.

Materials Science Poland

2019

tom Vol. 37, No. 1

116--121

Layered magnetic heterostructures are very promising candidates in spintronics in which the influences of interfaces, surfaces and defects play a crucial role. X-ray photoelectron spectroscopy (XPS) study has been performed for studying in detail the chemical state and electronic structure of Co2FeAl (CFA) Heusler alloy interfaced with Si substrates. XPS survey scan spectra have clearly shown the presence of Fe, Co and Al signal along with the signal due to Si. The presence of Co, Fe and Al signal confirms the formation of CFA alloy phase. Our XPS results support our previous study [1] on CFA/Si structure in determining the magnetic and transport properties across the interface.

Synthesis and characterization of Co2FeAl Heusler alloy nanoparticles

100%

Kumar A. , Srivastava P. C.

tom Vol. 31, No. 4

501--505

Heusler alloy Co2FeAl (CFA) nanoparticles have been synthesized by reducing a mixture of the precursors: CoCl2_6H2O, Fe(NO3)3_9H2O and AlCl3_6H2O under H2 atmosphere. XRD, SEM and TEM techniques have been used for the characterization of the prepared material. XRD and SAED data from TEM show the formation of mixed phases of L21, B2 and A2 type crystal structure of the alloy. The estimated particle size from XRD data and TEM micrograph has been found in the range of 10 nm to 50 nm. The saturation magnetization has been found of 115 emu/g from M-H characteristics which is close to its bulk value of saturation magnetization. Chemical composition of the elements has also been estimated from EDAX, which shows a ratio of Co:Fe:Al as 2.12:1.06:0.81.

The effect of zinc and phosphorus fertilization on zinc and phosphorus nutrition of maize during early growth

80%

Ali T. , Srivastava P. C. , Singh T. A.

tom 23

nr 1

Dissipation of nitrapyrin (nitrification inhibitor) in subtropical soils

80%

Rakhi , Srivastava A. , Srivastava P. C.

Polish Journal of Soil Science

2019

tom 52

nr 2

Nitrapyrin (2-chloro-6-(trichloromethyl)pyridine) is a specific nitrification inhibitor, applied in soils for reducing the nitrification process of nitrogenous fertilizers. The overall effect of nitrapyrin is enhancing the efficiency of nitrogenous fertilizers in soils and also controlling environmental pollution in water by preventing nitrate leaching in soils. Dissipation of nitrapyrin was evaluated in subtropical soils at two fortification levels of 2 and 4 µg·g⁻¹. The extraction of nitrapyrin was done by quick, easy, cheap, rugged and safe (QuEChERS) method and quantitative analysis – by high-performance liquid chromatography (HPLC). Nitrapyrin residues declined consistently with time in both types of soils and were not detectable (<0.05 µg·g⁻¹) on the 45th day at 2 µg·g⁻¹ and on the 60th day at 4 µg·g⁻¹ application rate. Dissipation of nitrapyrin occurred in a single phase with the persistence data fitting well to the first-order kinetics. The half-life of nitrapyrin was 9.6 and 9.9 d at 2 µg·g⁻¹ and 16.1 d and 17.3 d at 4 µg·g⁻¹ application rate in both types of soils. The results revealed higher persistence of nitrapyrin at higher concentration (4 µg·g⁻¹) in both types of soils, probably because of high temperature and humidity in subtropical soils.