• Kailash

      Articles written in Bulletin of Materials Science

    • Stone fragmentation by ultrasound

      S K Shrivastava Kailash

      More Details Abstract Fulltext PDF

      The presence of kidney stone in the kidney causes discomfort to patients. Hence, removal of such stones is important which is commonly done these days, non-destructively, with lithotripters without surgery. Commercially, lithotripters like extra-corporeal shock wave lithotripters (ESWL) made by Siemens etc are in routine use. These methods are very cumbersome and expensive. Treatment of the patients also takes comparatively more time because of more number of sittings. Some delicate nerves and fibres in the surrounding areas of the stones present in the kidney are also damaged by high ultrasonic intensity used in such systems. In the present work, enhancement of the kidney stone fragmentation by using ultrasound is studied. The cavitation bubbles are found to implode faster, with more disintegration efficiency of the lithotripters, which give better treatment to the patients.

    • Spin canting phenomenon in cadmium doped cobalt ferrites, CoCd𝑥Fe2−𝑥O4 (𝑥 = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), synthesized using sol–gel auto combustion method

      Sonal Singhal Sheenu Jauhar Kailash Chandra Sandeep Bansal

      More Details Abstract Fulltext PDF

      Synthesis of non-collinear (spin canted) ferrites having the formula, CoCd𝑥Fe2−𝑥O4 (𝑥 = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), has been carried out using the sol–gel auto combustion method. The ferrite samples show an interesting magnetic transition from Neel to Yafet–Kittel configuration, as the Cd2+ concentration is increased beyond 𝑥 = 0.4. The FT–IR spectra confirm the formation of the metal oxide bond as they exhibit two frequency bands in the range of ∼595 cm-1 and ∼450 cm-1, corresponding to the tetrahedral and the octahedral stretching vibrations of the metal oxide, respectively. The structural evolutions of the nanophase investigated using powder X-ray diffraction (XRD) technique show that the average crystallite size is ∼35 nm. The magnetic studies reveal that the saturation magnetization, 𝑀s, increases up to 𝑥 = 0.4 and decreases when the value of 𝑥 is > 0.4. It is proposed that the incorporation of Cd2+ ion takes place into the tetrahedral sites and up to 𝑥 = 0.4, Neel’s model is followed. But for 𝑥 > 0.4, canting of spins occurs, as explained by Yafet–Kittel (Y–K) model. The d.c. resistivity decreases as a function of temperature, indicating semiconducting nature of the ferrites and the positive value of Seebeck coefficient establishes 𝑝-type conduction behaviour for all the ferrite samples.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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