Browsing by Author "Nirala G."

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    Bioactive Glass for Biomedical Application: An Overview
    (Springer Science and Business Media Deutschland GmbH, 2024) Yadav S.; Yadav D.; Kumar P.; Yadav A.; Nirala G.; Yadav S.
    The term �bioceramics� describes the ceramics utilized in the reconstruction and restoration of damaged or diseased musculoskeletal system parts. Based on their biological response, bioceramics can be divided into three categories: basically bioinert materials (like zirconia and alumina), bioactive materials (like HA and bioactive glasses), and biodegradable materials (like TCP). Bioactive ceramics, including calcium phosphates, glass�ceramics, and bioactive glasses, can encourage the formation of hydroxyapatite deposits that resemble bone at their surface and offer an interface that contributes to the functional durability of the tissue. An amorphous material with an arbitrary atom configuration is called bioactive glass. The majority of bioactive glasses are mostly composed of SiO2, Na2O, CaO, and P2O5. Fast bonding to bone occurred when the bioactive glass�s silica content was between 42 and 53%. For the production of silicate-, phosphate-, and borate-based bioactive glasses, several compositional modifications are made to the bioactive glasses. They have been employed, among other things, in dental root replacements, middle ear replacements, and bone scaffolds. Bioactive glasses have the ability to form a chemical link with living bone tissue, which is further enhanced by biological responses on the material�s surface. Due of its low mechanical qualities, bioglass cannot be used for large load-bearing applications. These are employed in situations where mechanical strength is not required and regeneration is essential. � The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Influence of La3+ doping on structural and optical properties of SrCeO3 perovskite
    (Institute of Physics, 2024) Yadav D.; Kumar P.; Tripathi A.K.; Yadav R.S.; Nirala G.; Yadav S.; Yadav A.K.; Yadav S.
    The SrCe1-xLaxO3 (x = 0.0, 0.02, 0.4, 0.6, and 0.10) perovskite materials have been successfully synthesized by auto-combustion method and calcined at 1100�C. The XRD patterns reveal a highly crystalline orthorhombic crystal structure with a Pnma space group in all samples. The TEM micrograph shows a spherical morphology of the 10 mol% La3+ doped SrCeO3 perovskite sample alongwith the SAED pattern confirming its highly crystalline nature. The incorporation of La3+ ion in the SrCeO3 perovskite has been confirmed by the Raman and Fourier transform infrared (FTIR) measurements. The UV-vis absorption spectra at room temperature show various bands, with a strong absorption band observed below 400 nm. The optical band gap of the undoped and La3+ doped samples have been calculated and it is smaller for the La3+ doped perovskite samples than that of the undoped perovskite sample. Therefore, the La3+ doped SrCeO3 perovskite may be applicable for optoelectronic applications. � 2024 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
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    The emergence of Griffiths phase in CaCu3Ti(4?x)Mn xO12 (CCTMO, x = 1, 2 and 3) geometrically frustrated antiferromagnetic complexes perovskite
    (Springer, 2024) Kumar V.; Kumar A.; Singh S.; Kumar K.; Verma M.K.; Rai V.S.; Nirala G.; Upadhyay S.; Yadav N.; Singh N.B.; Tiwary D.; Mandal K.D.
    In this work, we have reported the rare coexistence of a Griffiths phase (GP) in a complex perovskite oxide with geometrically frustrated antiferromagnetism. We have achieved this by substituting Manganese (Mn) in the titanium site of CaCu3Ti(4?x)MnxO12 (CCTMO, x = 1, 2 and 3). The occurrence of a Griffiths phase is observed when a strong contest between antiferromagnetic transition (TN) and paramagnetic (PM) occurs in the magnetic domain. As we increased the molar concentration of Manganese while substituting at titanium site in CaCu3Ti4O12, we observed the appearance of a step-like Griffiths phase. Manganese (Mn)-substituted materials exhibit paramagnetic (PM) to ferromagnetic (FM) phase transitions below CaCu3Ti3Mn1O12 (CCTM1O), CaCu3Ti2Mn2O12 (CCTM2O), and CaCu3Ti1Mn3O12 (CCTM3O), marked by a rapid step-like change in the magnetic moment due to spin ordering. The deviation of inverse magnetic susceptibility (??1) from Curie�Weiss behavior occurs in the temperature ranges of 75 to 190�K, 80 to 200�K, and 150 to 280�K, respectively. The emergence of the Griffiths phase before the actual PM�FM transition indicates that the inhomogeneous phase above the Curie temperature (T C), which can be defined as a Griffiths phase, is dominated by ferromagnetic interactions rather than antiferromagnetic ones. The presence of a Griffiths-like phase beyond its Curie temperature (T C) is indicated by low-field DC magnetization of the nanostructures, showing abnormal magnetic behavior. The presence of short-range magnetic correlations and ferromagnetic clusters in the system due to the size decrease is linked to this unexpected behaviour. � 2024, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.