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Nanopages
Authors: I. Tamáska, Z. Vértesy, A. Deák, P. Petrik, K. Kertész, and László Biró

L. P. Biró, K. Kertész, Z. Vértesy, G. I. Márk, Zs. Bálint, V. Lousse, J.-P. Vigneron, Living photonic crystals: Butterfly scales — Nanostructure and optical properties, Mater. Sci. Eng. C, 27, 941–946 (2007

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Nanopages
Authors: V. Koval, Y. Yasievich, M. Dusheyko, A. Ivashchuk, O. Bogdan, and Y. Yakymenko

M. Losurdo et al., Interrelation between microstructure and optical properties of erbium-doped nanocrystalline thin films, Physica E, 16, 414–419 (2003). Losurdo M

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. 35. Asahi , R , Taga , Y , Mannstadt , W , Freeman , AJ . Electronic and optical properties of anatase TiO 2 . Phys Rev B . 2000 ; 61 : 7459 – 7465 . 10.1103/PhysRevB.61

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Abstract  

Thermoluminescence and optical properties of LiF:Mg,Cu,P; BaSO4:Dy; BaSO4; Eu and α-Al2O3:C were investigated as a part of a broader research project on TL mechanisms in various materials. The effects of ionizing radiation on these phosphors are determined in this work by means of thermoluminescence and optical absorption experiments with the aim of identifying new defects formed in these systems and of testing dosimetric characteristics.

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. 22. Parthiban , S , Murali , S , Madhurambal , G , Meenakshisundaram , SP , Mojumdar , SC . Effect of zinc(II) doping on thermal and optical properties of potassium hydrogen phthalate (KHP) crystals . J Therm Anal

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properties of magnesium rubidium sulfate hexahydrate (MRSH) crystals [ 17 ]. In continuation of our work, in the present investigation, an attempt has been made to study the effect of Vo(II) doping on the thermal and optical properties of MRSH crystals

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Abstract  

Phosphates belong to the extensive group of inorganic pigments that are very often used in industry of plastics and anticorrosive paints. Also, the powders of newberyite MgHPO43H2O and α-pyrophosphate Mg2P2O7 can find the usage in this field. Thus, these compounds were the centre of our attention. Newberyite and α-pyrophosphate were synthesized by the method of gelling. Impact of various ways of synthesis, especially reaction conditions, on the structural, thermal, physical and optical properties was investigated. α-pyrophosphate was synthesized by the thermal decomposition of newberyite at temperature around 500C. Both powders are white color, but the newberyite is the whitest one. The reaction pH particularly affected the particle size distribution and optical properties.

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Journal of Thermal Analysis and Calorimetry
Authors: S. Meenakshisundaram, S. Parthiban, R. Kalavathy, G. Madhurambal, G. Bhagavannarayana, and S. Mojumdar

Abstract  

The influence of heteroaromatic N-base (1,10-phenanthroline) (Phen), a new additive as complexing agent on tris(thiourea)zinc(II)sulphate (ZTS) crystals from aqueous solutions at 30 °C is investigated. Crystals were grown using low concentration of the dopant (0.005 M L−1) in the aqueous growth medium and the growth promoting effect (GPE) is much greater because of an increase in the metastable zone width. High dopant concentration decreases GPE. The crystalline perfection of the grown crystals is quite good both in doped and undoped crystals as evaluated by high-resolution X-ray diffractometry (HRXRD). The diffraction curve of a typical Phen doped as-grown ZTS crystal was observed to contain a single peak indicating that the crystal does not contain any epitaxial layer on the surface or internal structural grain boundaries. Not much variation is observed in FT-IR and XRD of pure and doped ZTS. Phen depresses the NLO efficiency of ZTS. It could be ascribed due to the disturbance of charge transfer in the presence of the dopant. The grown crystals were also characterized by UV–Vis, SEM and TG–DTA techniques.

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Abstract  

The influence of doping the transition metal Zn(II) on potassium hydrogen phthalate (KHP) crystals has been studied. A close observation of FT-IR and XRD profiles of doped and undoped samples reveals some minor structural variations. It appears that the crystal undergoes considerable lattice stress as a result of doping the bivalent zinc. Furthermore, the possibility of cation vacancies aroused owing to the substitution of K1+ by Zn2+ could result in a defective crystal system. Energy dispersive spectra reveal the incorporation of Zn(II) in the crystalline matrix of KHP crystals. Differential scanning calorimetry (DSC) and TG-DTA studies reveal the purity of the sample and no decomposition is observed below the melting point. Small quantity additions of Zn(II) enhance the fluorescence intensity of KHP crystals. The doping results in morphological changes and significantly improves the second harmonic generation (SHG) efficiency of the host crystal.

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Abstract  

A new instrument for DSC in combination with thermomicroscopy in transmitted light is described, where a DSC device is in corporated within a commercially available hot stage.

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