Entity

Time filter

Source Type


Lincy A.,Smart Materials Analytic Research and Technology SMART | Mahalakshmi V.,Smart Materials Analytic Research and Technology SMART | Thomas J.,Smart Materials Analytic Research and Technology SMART | Saban K.V.,Smart Materials Analytic Research and Technology SMART
Indian Journal of Physics | Year: 2012

Manganous malonate dihydrate crystals have been grown by ionic diffusion in hydrosilica gel. Powder XRD pattern and the FTIR spectrum have been recorded for the sample. The vibrational bands corresponding to various functional groups are identified. Thermogravimetric studies have been done to explore the nature of the material as regards thermal decomposition. © 2012 IACS. Source


Mahalakshmi V.,Smart Materials Analytic Research and Technology SMART | Lincy A.,Smart Materials Analytic Research and Technology SMART | Thomas J.,Smart Materials Analytic Research and Technology SMART | Saban K.V.,Smart Materials Analytic Research and Technology SMART
Optik | Year: 2014

A promising non-linear optical (NLO) crystal, aqua maleatocopper(II) (CuC4H2O4·H2O), was grown at room temperature by the controlled ionic diffusion technique. Fourier transform infrared spectrum could identify the various functional groups in the crystal. Structural analysis using single crystal XRD revealed that the compound crystallizes in the monoclinic system with space group P21 and unit cell parameters a = 7.7277(5) Å, b = 5.2967(3) Å, c = 7.7179(4) Å, α = γ = 109.170(5), β = 111.995(2). The thermal stability and decomposition pattern of the material were explored using thermogravimetry (TG) and differential thermal analysis (DTA). The optical band gap energy of the material was estimated as 2.2 eV from the diffuse reflectance spectroscopy. The Kurtz and Perry powder technique established the crystal to be an efficient non-linear optical (NLO) material. © 2013 Elsevier GmbH. Source


Thomas J.,Smart Materials Analytic Research and Technology SMART | Lincy A.,Smart Materials Analytic Research and Technology SMART | Mahalakshmi V.,Smart Materials Analytic Research and Technology SMART | Saban K.V.,Smart Materials Analytic Research and Technology SMART
Crystallography Reports | Year: 2013

Prismatic crystals of manganous malate have been prepared by controlled ionic diffusion in hydrosilica gel. The structure was elucidated using single crystal X-ray diffraction. The crystals are orthorhombic with space group Pbca. Vibrations of the functional groups were identified by the FTIR spectrum. Thermogravimetric and differential thermal analyses (TG-DTA) were carried out to explore the thermal decomposition pattern of the material. Structural information derived from FTIR and TG-DTA studies is in conformity with the single crystal XRD data. © 2013 Pleiades Publishing, Ltd. Source


Lincy A.,Smart Materials Analytic Research and Technology SMART | Mahalakshmi V.,Smart Materials Analytic Research and Technology SMART | Thomas J.,Smart Materials Analytic Research and Technology SMART | Saban K.V.,Smart Materials Analytic Research and Technology SMART
Optik | Year: 2013

Single crystals of manganese malonate dihydrate have been grown by the controlled diffusion of ionic species in hydrosilica gel. The crystals are found to be antiferromagnetic and optically nonlinear. X-ray diffraction studies on single crystals showed that the compound crystallizes in the orthorhombic system with a non centrosymmetric space group Pca21. The unit cell parameters are a = 8.309 Å, b = 9.590 Å, c = 7.327 Å. The UV-vis spectrum indicates good transparency in the visible region. The optical band gap of the material was estimated using diffuse reflectance spectroscopy (DRS). The second harmonic generation (SHG) efficiency of the material, evaluated using Kurtz and Perry powder test, is comparable with that of standard KDP crystals. Electrical and dielectric properties of the material were investigated over wide frequency and temperature range. The optical nonlinearity and SHG efficiency are attributed to the molecular acentricity and intermolecular hydrogen bonding. Distinctive structural features inclusive of acentric space group, intermolecular hydrogen bonding and bridging through anti-syn and anti-anti malonate groups are accountable for the antiferromagnetism exhibited by the material. © 2012 Elsevier GmbH. All rights reserved. Source


Lincy A.,Smart Materials Analytic Research and Technology SMART | Mahalakshmi V.,Smart Materials Analytic Research and Technology SMART | Tinto A.J.,Smart Materials Analytic Research and Technology SMART | Thomas J.,Smart Materials Analytic Research and Technology SMART | Saban K.V.,Smart Materials Analytic Research and Technology SMART
Physica B: Condensed Matter | Year: 2010

Well-faceted crystals of cobaltous malonate (C6 H12 Co2 O12) have been grown by the controlled diffusion of ionic species in hydrosilica gel. Single crystal X-ray diffraction studies show that the crystal belongs to the monoclinic system with space group C2/m. The unit cell dimensions are a=12.6301(9) , b=7.3857(9) , c=7.2945(7) , α=γ=90°, β=120.193(9)°. The functional groups, elucidated from the FT-IR spectrum, are in conformity with the information derived from the X-ray diffraction studies. The thermal behaviour of the material has been investigated using TG-DTA in the temperature range 301050 °C. The optical band gap of the sample is estimated using diffuse reflectance spectroscopy (DRS). The dielectric constant and dielectric loss of the crystal have been studied over wide temperature and frequency ranges. AC conductivity measurements reveal a thermally activated process and the mechanism behind the conduction process has been discussed. © 2010 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations