Optical absorption in gel grown cadmium tartrate single crystals

Abstract

Abstract. Single crystals of cadmium tartrate pentahydrate (CTP) have been grown by the famous gel technique. The slow and controlled reaction between Cd 2+ and (C 4 H 4 O 6 ) 2-ions in silica hydrogel results in formation of the insoluble product, CdC 4 H 4 O 6. 5H 2 O. Optical absorption spectra have been recorded in the range 200 to 2500 nm. Fundamental absorption edge for electronic transition has been analyzed. The direct allowed transition is found to be present in the region of relatively higher photon energy. Analysis of the segments of 1/2 versus h graph has been made to separate individual contribution of phonons. The phonons involved in the indirect transition are found to correspond to 335 and 420 cm -1 . Scattering of charge carriers in the lattice is found due to acoustic phonons.

Crystallization in Gels

“…Sr-oxalate X [187,188] Cd-oxalate X Diamagnetic [189][190][191] CdMgHPO 4 X [192] Ndhepthamolybdate X [193] Lahepthamolybdate X X [194] Cu-succinate X [195] Cu-tartrate Diamagnetic [195] …”

Dielectric Relaxation, Conductivity Mechanism and Complex Impedance Spectroscopic Studies of Pure and Cadmium Mixed Cobalt Levo-Tartrate Crystals

“…Earlier, the reports are available on structural, thermal, magnetic and dielectric studies of cobalt tartrate crystals [3,4]. Whereas, several studies like structural, thermal, FTIR, UV-Vis, electrical conductivity, optical absorption, micromechanical and dielectric studies are reported for cadmium tartrate crystals [5][6][7][8].…”

Tuning the aspect ratio of hydrothermally grown ZnO by choice of precursor

“…The Urbach's energy measures the standard of crystal disorder and electronic band structure [35,36]. The calculated values of Urbach's energy are listed in Table 2 and their values increases in the order of Z1oZ2oZ3.…”