A. B. Kulkarni

Crystal growth and electrical properties of Li2B4O7

Growth of Li 2 B 4 O 7 crystals has been carried out under hydrothermal conditions at relatively low temperature and pressure conditions ( T = 250 °C, P = 100 bars). A systematic study of electrical measurements has been carried out within a wide range of internal frequency and temperature. The corresponding impedance, Arrhenius, and Bode plots are given.

Synthesis and characterization of Na2(R,Co)Zr(PO4)3 crystals.

Abstract New phosphates, Na 2 (R, Co)Zr(PO 4 ) 3 , where R ≡ La, Ce, Pr or Nd, were synthesized 1. (a) by chemical reactions, 2. (b) from aqueous solutions, and 3. (c) by a hydrothermal technique. The quality of the resulting material depends strongly upon the technique used. Method (c) is best suited for the growth of high-quality single crystals. The introduction of R elements produces NASICON analogues with simpler structures, which are prospective superionic conductors.

Li3B5O8(OH)2: crystal growth and ionic conductivity studies

Li3B5O8(OH)2 crystals were grown using hydrothermal techniques applied to the system Li2O–B2O3–H2O. Detailed ionic conductivity measurements have been performed.

Synthesis and characterization of new superionic conductors NaCu2ZrP3O12 and Na2(La, Fe)ZrP3O12

Abstract New superionic conductors, NaCu 2 ZrP 3 O 12 and Na 2 (La, Fe)ZrP 3 O 12 crystals were synthesized by chemical reactions and hydrothermal method. The crystals were characterized by using XRD, SEM, chemical analysis and the measurements of ionic conductivity. According to the X-ray powder data NaCu 2 ZrP 3 P 12 and Na 2 (La, Fe)ZrP 3 O 12 crystallize in tetragonal and orthorhombic systems, respectively. The ionic conductivity values were found to be in the order of 10 −2 to 10 −1 (Ω cm) −1 at 300°C and the activation energy for ionic motion was in the range of 0.5–0.8 eV.

Synthesis and characterization of sodium zirconium oxysilicate crystals

Synthese, affinement structural et mesures de la conductivite ionique de cristaux doxysilicate de sodium et de zirconium