The influence of the point defects introduced by means of Sm3+ on the thermal properties of LiKSO4 crystals was studied in the vicinity of the high-temperature phase at 708 and 940 K. The temperature dependence of the specific
heat was found to vary monotonously with the Sm3+content, while the first transition temperature was unchanged. The change in the value of the specific heat was attributed
to the correlation between the defect-defect interaction and the presence of internal local strain generated inside the crystal.
The variation of the excess specific heat with the reduced temperature obeys the 3d Ising model.
Authors:S. Gopinath, S. Barathan, and R. Rajasekaran
Extensive research has been made over the past few decades on the growth of non-linear optical (NLO) crystals. NLO materials have their potential applications in the field of laser technology, optical communication
Authors:P. Malliga, C. Alosious Gonsago, P. Sagayaraj, and A. Joseph Arul Pragasam
inorganic acid and salts to produce outstanding materials for NLO applications. Single crystal of l -alanine with excellent NLO property was first reported by Misoguti et al. [ 10 ]. Many authors have intensively studied the growth and characterization of
Authors:M. Mariappan, G. Madhurambal, B. Ravindran, and S. C. Mojumdar
are very useful techniques for materials characterization. Therefore, it is not surprising that many authors have applied these techniques for investigation of many materials [ 19 – 32 ]. In this study, mixed crystals of bisthiourea-urea (BTU) have
Authors:V. Meenatchi, K. Muthu, M. Rajasekar, S. P. Meenakshisundaram, and S. C. Mojumdar
crystallization method needle-like salicylic acid crystals of 10–12 mm in length have been grown [ 7 ]. Guo et al . [ 8 ] and Zhang et al . [ 9 ] have prepared needle-like salicylic acid crystallites with average diameters of 34 and 16 μm, respectively, by
Authors:S. Janarthanan, R. Sugaraj Samuel, Y. C. Rajan, P. R. Umarani, and S. Pandi
It is very essential to grow large size single crystals of new organic non-linear optical (NLO) materials with increased perfection due to rapid developments happening in the photonics technology. Many organic
Authors:G. Vasudevan, P. AnbuSrinivasan, G. Madhurambal, and S. C. Mojumdar
ammonium sulphate added KAP solutions were taken in two similar beakers at 30 °C (room temperature) and kept undisturbed by covering with a thick sheet of paper for controlled slow evaporation after solubility determination. Good quality crystals of pure
A survey of materials science through our experiences shows that our knowledge of amorphous solids is quite poor compared
with that of crystalline solids. Most pure substances can be obtained, in principle, as crystalline as well as non-crystalline
states by physical and chemical methods. Destruction of the three-dimensional periodicity in crystalline substances will produce
novel properties which cannot be anticipated from knowledge of crystal sciences. One direction of materials science in the
coming century will surely be a new realm of amorphous condensed matter science.