Browsing by Author "Anod Kumar Singh"

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Microwave synthesis of hydroxyapatite bioceramic and tribological studies of its composites with SrCO3 and ZrO2
(Springer New York LLC, 2016) C.R. Gautam; M. Tamuk; C.W. Manpoong; S.S. Gautam; Sunil Kumar; Anod Kumar Singh; V.K. Mishra
Hydroxyapatite (HAp) powders were prepared successfully using microwave-assisted co-precipitation method. HAp powder was characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy for structural confirmation of the prepared material. Further, six composites of HAp with SrCO3 and ZrO2 were synthesized to study the morphological and tribological behaviour. Three composites of HAp with three varying 2, 4, 6 wt% of SrCO3 and similarly other three with ZrO2 were prepared using solid-state route method. Scanning electron microscopy (SEM) analysis confirmed that the presence of SrCO3 and ZrO2 among HAp particles helps in grain growth during the sintering processes. The tribological study reveald that the inclusion of SrCO3 and ZrO2 in pure HAp enhanced the resistance to wear and specific wear rate. The average grain size of HAp–ZrO2 was observed more in comparision to the average grain size of the HAp–SrCO3. The values of the specific wear rate and wear of HAp–SrCO3 and HAp–ZrO2 composite ceramics lies in the range from 4.13,239 × 10−5 to 5.44517 × 10−5 mm3/Nm and 4.68693 × 10−5 to 6.10099 × 10−5 mm3/Nm, respectively. © 2016, Springer Science+Business Media New York.
Synthesis, physical, optical and structural properties of SrTiO3 borosilicate glasses with addition of CrO3
(Springer, 2023) Abhishek Madheshiya; Anod Kumar Singh; Shweta; Rajat Kumar Mishra; Krishna Kishor Dey; Manasi Ghosh; Kamal K Srivastava; Prerna Garg; Chandkiram Gautam
Herein, we reported physical, optical and NMR characteristics of SrTiO3-based borosilicate glasses-doped chromium trioxide, CrO3 (1–7 mol%). Five glass samples (GS) were fabricated from the glassy system 60[Sr·TiO3]–40[2SiO2·B2O3] via a rapid melt-quench technique. X-ray diffraction analysis revealed the unstructured behaviour of the glasses. Numerous physical parameters were calculated and explained in detail. Urbach energy (EU) and skin depth (δ) were studied to approve the disordered structure of glasses. Recorded infrared spectra of glasses were utilized to clarify the stretching mode of vibrations between the atoms, which correlated with their structural features and compositional variations. The energy bandgap (Eg) was estimated by employing a Davis and Mott relationship that comprises an absorption coefficient, α, as well as photon energy, hυ. Further, nuclear magnetic resonance (solid-state) spectra of the glasses were recorded and their analysis showed that the silicate and borate networks became highly polymerized with decreasing concentration of SrTiO3. © 2023, Indian Academy of Sciences.