SPMS, Thapar University, Patiala

M-type Barium hexaferrite (BaFe O ) with substitution of Ba by rare earth metal La were prepared by solid state synthesis method from as-prepared powder of barium monoferrite (Ba -La Fe O ) ( 0.0, 0.1 and 0.2). The structural and magnetic properties of Ba -La Fe O were investigated by X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Mössbauer spectroscopy. The refined XRD patterns suggests the formation of single phase hexaferrite. With increased La substitution (x), the saturation magnetization increased and reached maximum at and decreased at , without any noticeable change in coercivity. Fitted Mössbauer spectra of Ba -La Fe O showed increase in hyperfine field and a transition from Fe ion to Fe ion at site. The present work demonstrates a new methodology for two stage substitution. Index Terms-Barium hexaferrite, barium monoferrite, magnetic properties.

Four different transition metals contained nanocrystalline glass ceramics are synthesized by melting and
quenching technique. The transition metal oxides play as former, modifier or both the roles depending on
their oxidation states, field strength and covalent characteristics. The optical band gaps are observed in
the range of 3.2–5.5 eV. The presence of nano-crystalline phases dominates the optical band gap. The
softening temperature (Ts) is mainly affected by the residual glass in glass ceramics. These glass ceramics
can be used as shielding materials for nuclear waste.

Glassesandglassceramicswithcompositionof45SiO2–25CaO–5P2O5–10Na2O–(15 − x)MnO2 − xFe2O3(x = 0,
5, 10 and 15) were prepared by melt-quenching technique. In the present work, the physical, structural and optical
properties of these samples were investigated and correlated with the structural changes induced in the samples
due to replacement ofMnO2 with Fe2O3. Density andmolar volume of the samples increased with Fe2O3 ad-
dition. Fe3+ is reduced to Fe2+ duetodepletedpresenceofoxygenat1550°Cinfurnaceandformedin-situ
nano-crystalline phase in x = 10 and 15 samples,which enhanced the optical and structural stability of the sam-
ples. High Fe2O3 content prevented glass formation as observed in XRD results. The optical band gap decreases
and sharpness of FTIR bands increases with Fe2O3 content. Highest refractive index and lowest Fermi energy is
obtained for x = 15 sample.

Agricultural waste ashes are used as resource materials to synthesize new glass and glass-ceramics. The as-prepared materials are characterized using various techniques for their structural and dielectric properties to check their suitability in microelectronic applications. Sugarcane leaves ash exhibits higher content of alkali metal oxides than rice husk ash, which reduces the melting point of the components due to eutectic reactions. The addition of sugarcane leaves ash in rice husk ash promotes the glass formation. Additionally, it prevents the cristobalite phase formation. These materials are inherently porous, which is responsible for low dielectric permittivity i.e. 9 to 40. The presence of less ordered augite phase enhances the dielectric permittivity as compared to cristobalite and tridymite phases. The present glass-ceramics exhibit lower losses than similar materials synthesized using conventional minerals. The dielectric permittivity is independent to a wide range of temperature and frequency. The glass-ceramics developed with adequately devitrified phases can be used in microelectronic devices and other dielectric applications.

We report on the structural, magnetic and bioactive properties of TiO2 modified silicate glasses. Additions of TiO 2 and heat treatment, shows remarkable and distinguishable effect on the properties of the glasses. Growth of titania-modified magnetic nanocrystals played effective role in the evolution of magnetic properties of the glass-ceramics. Some of the samples exhibit superparamagnetic nature, while others are found to be antiferromagnetic. Interestingly, after heat-treatment the magnetization trend of the samples reversed. The invitro bioactivity of these glass-ceramics was accessed by the formation of bone-like apatite structures on their surfaces after immersion in simulated body fluid (SBF). The magnetic properties along with the bioactivity of present glass-ceramics indicate their usefulness in the magnetically induced hyperthermia treatment of cancer.

In the last decade, charmed and bottom meson spectroscopy have seen great success in experimental sector. Experiments like LHCb, Babar etc are providing many new states which are being added to their spectroscopy. Newly predicted states like B(5970), D 2 (3000), D * (3000), B(5840) and many more still need to be assigned their proper place in the spectroscopy. So we studied the decay constant and the coupling constants of these states using the heavy quark effective theory as our model. We analyzed the two-body strong decays of the above states to their ground state mesons with light pseudo-scalar mesons (π, η, K). We also obtained the ratios among their strong decays, which can be confronted to the experimental data for the verification of their J P states. In addition to this, we also study the strong decays of their spin and strange partners, which are still experimentally not observed, and may be useful for future experiments in searching for these heavy-light mesons.

Recently LHCb predicted spin 1 and spin 3 statesDs1⁎(2860)andDs3⁎(2860)which are studied through their strong decays and are assigned to fit the13D1and13D3states in the charm spectroscopy. In this paper, using the heavy quark effective theory, we state that assigningDs1⁎(2860)as the mixing of13D1-23S1states is rather a better justification to its observed experimental values than a pure state. We study its decay modes variation with hadronic coupling constantgxhand the mixing angleθ. We appoint spin 3 stateDs3⁎(2860)as the missing1D  3-JPstate and also study its decay channel behavior with coupling constantgyh. To appreciate the above results, we check the variation of decay modes for their spin partners states, that is,1D2and1D2′, with their masses and strong coupling constant, that is,gxhandgyh. Our calculation using HQET approach gives mixing angle of the13D1-23S1state forDs1⁎(2860)to lie in the range (-1.6radians≤θ≤-1.2radians). Our calculation for coupling constant values gives...

Recently significant progress has been achieved in studying the spectroscopy of mesons with one heavy quark (Q = c, b) and one light quark (q = u, d, s). Several new excited states D0 * (3000), D’1(3000), D2(2740), D3*(2760) and DS3*(2860) are discovered in charm spectra [1]. But there is very limited information on the spectra of excited bottom mesons. Only the ground state S-waves and a few of the J P = 3/2 P-waves (1 + , 2 + ) are presently well established. The theoretical tools available to determine the properties of excited states in heavylight systems are heavy quark effective theory (HQET), QCD sum rules, 3 P0 model, QCD lattice etc. In this paper we study the unknown ( ̃ ̃ ) P-wave for n=2 and (B2, B3*) D wave for n=1 B and BS meson states in the framework of heavy quark effective theory and calculated their masses and strong decay widths.

Successful preparation of ZnO-Mn3O4 composite through chemical route. • 98 % removal of methylene blue dye in the presence of equimolar composite sample. • Excellent stability of equimolar composite up to 8 continuous photochemical cycles. • Equimolar composite exhibited the highest double layer capacitance (=0.1434 Fg-1).