Melt synthesis and characterization of complexed perovskite-oxides in the system of A2+(B+ 2/5B6+ 3/5)O3 - A3+(B+ 3/5B6+ 2/5)O3

Abstract

In order to synthesize various Perovskite ABO 3 type compounds and their solid solutions, we have applied a novel "melt synthesis technique" rather than conventional solid state reaction techniques. In the melt synthesis, the mixture of oxides or their precursors is melted in a short period of time (1-60 sec) by a strong light radiation in an arc imaging furnace. A spherical molten sample where multiple cations were mixed homogeneously was directly solidified on a copper hearth with a rapid cooling of 10 2 K/sec. Solid solutions based upon 1:1 ordered Perovskite in the system of Sr(Li 2/5 W 3/5 )O 3 -La(Li 3/5 W 2/5 )O 3 were synthesized in this technique.

Room-Temperature Solid State Contact Reaction Synthesis of Rare Earth Free RbVO3Phosphor and Their Photoluminescence Properties

“…For instance, we previously reported the synthesis of several highly stable perovskite polycrystals (large -H) from a hightemperature melt condition. [43][44][45] The condensed reaction field of such melts increases the probability of contact between reactant species, whereas solution processes occur in relatively dilute solutions, in which the contact between reactive species is lower.…”

Combinatorial synthesis of phosphors using arc-imaging furnace

“…In this study, each sample was melted within 30-60 s. By mixing different raw material components, 24 homogeneously melted samples can be prepared within 30 min using this equipment. Details of the furnace have been reported elsewhere [7][8][9]. When a sample is melted, it forms a globule of 1-5 mm diameter owing to the surface tension; this reduces the contact area with the Cu hearth, and thus the heat exchange.…”

Melt synthesis of Eu-doped oxide phosphors using arc-imaging furnace

“…The brightness temperature can be monitored using a pyrometer. To calibrate this pyrometry system, the solidification temperatures of refractory oxides were measured as Al 2 3,4 Details of the furnace and the pyrometry were reported in earlier papers. 3,4 When a sample is melted, it becomes a small (1-5 mm) molten globule because of its surface tension; thereby it gives almost point-contact to the Cu hearth, which minimizes the heat loss by the hearth.…”