Reversible magnetic phase transitions of MnO 2 nano rods by shock wave recovery experiments
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Reversible magnetic phase transitions of MnO2 nano rods by shock wave recovery experiments A. Rita1, A. Sivakumar1, S. Sahaya Jude Dhas2, and S. A. Martin Britto Dhas1,*
1 2
Department of Physics, Abdul Kalam Research Centre, Sacred Heart College, Tirupattur, Tamilnadu 635 601, India Department of Physics, Kings Engineering College, Sriperumbudur, Chennai, Tamilnadu 602 117, India
Received: 23 June 2020
ABSTRACT
Accepted: 28 September 2020
In the present research article, considering the impact of shock wave recovery experiments which have the potential scope to expand and explore the possibility as well as the feasibility of materials to be used in aerospace and military applications, authors have performed and demonstrated the stability of molecular, structural, morphological, and magnetic properties of MnO2 nanorods under shock wave-loaded conditions. Hydrothermal method has been utilized to synthesize a-MnO2 nanorods which have been loaded with different shock pulses such as 50, 100, 150, and 200, respectively, with the Mach number of 2.2. Molecular, crystallographic structure, and morphological and magnetic studies have been carried out using FTIR, PXRD, SEM, and VSM analyses, respectively, so as to understand the impact of shock waves on the test material. Interestingly, the obtained results confirm that the prepared a-MnO2 nano rods possess excellent molecular, structural, and morphological stability. Surprisingly, it exhibits the reversible magnetic phase transition i.e., from anti-ferromagnetic to paramagnetic nature which is verily confirmed by VSM analysis. Hence, we would like to suggest that the test material is highly suitable for magnetic sensors.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In the history of research world, metal oxide nanoparticles have convincingly contributed in such a way that special attention has been consistently extended by almost all researchers of this area due to their fascinating physical and chemical properties [1, 2]. Especially, transition metal oxide nanomaterials (Ti, Zn, Mg, Mn, Cd, Ni) have made considerable
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https://doi.org/10.1007/s10854-020-04555-5
inroads into the modern technology bringing about a sea of advancements. Most of the metal oxide NPs as that of ZnO, TiO2, and MnO2 have polymorphic crystalline phases in which polymorphic changes can be achieved by exposing the material to high temperature and pressure [2, 3]. In the ocean of metal oxides, manganese has nearly 30 oxides which include the multivalent phases such as ?3, ?4, ? 5, ?7, etc. [1, 2]. Some of the oxides of manganese are
J Mater Sci: Mater Electron
present in nature such as MnO2, Mn2O3 and Mn2O7, etc. [1]. Among all manganese oxides, MnO2 has received commendable attention from the researchers because of its polymorphic phases of a, b, c, and d [4]. Furthermore, it is highly sensitive to catalytic activities so that it finds many other applications in super capacitors, ion sieves a
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