Growth and characterization of large CeAlO3 perovskite crystals

Abstract

This study is focused on obtaining large CeAlO3 single crystals. Using Czochralski and Edge-Defined Film Fed Growth techniques, crystals of length up to 130 mm were obtained. The crystals belong to the tetragonal low temperature modification of CeAlO3, space group P4/mmm, a=3.7669Å, с=3.7967Å. Density and crystallographic parameters, as well as some optical, luminescence and magnetic properties of CeAlO3 were studied. The crystals demonstrate rather bright luminescence under UV-excitation, while no luminescence has been registered under Xrays. Ceramic and single crystalline CeAlO3 samples demonstrate p-type conductivity and promising paramagnetic properties.

Origin of Color Centers in the Perovskite Oxide CeAlO3

“…It is for this cause that the sample CAPNa displays a tint of yellow‐green. A similar green color is also demonstrated in larger CeAlO 3 single crystal when heat treated in vacuum . Unfortunately, researchers remain puzzled over the accurate origin for the absorption peaks.…”

“…Shishido mentioned a pale yellow color of CeAlO 3 . Recently, Arhipov obtained large single CeAlO 3 perovskite crystal firstly . When the as‐grown crystal was treated in vacuum, a green color is observed.…”

“…The oxygen amount is decreased for green sample. It is reported that annealing treatment in reducing atmosphere cannot cause green color of CeAlO 3 crystal, but in vacuum it can . Generally, synthesis in vacuum condition will produce more V O .…”

Crystal growth and characterization of the pyrochlore Tb2Ti2O7

“…It seems to be more appropriate to use the edge-defined film-fed growth (EFG) method, which is proven to permit excellent control of the growth processes for a variety of materials e.g. for rutile 44 , cerium aluminate 45 , rare-earth orthovanadates 46 , and strontium titanate 31 . For all of these oxides, Czochralski growth was less successful since pronounced growth instabilities occurred.…”

Czochralski Growth, Magnetic Properties and Faraday Characteristics of CeAlO3 Crystals

“…Its magnetic and electrical properties have also been reported [22,23], but little research has been done on the growth and properties of bulk crystals. Until 2015, CeAlO 3 crystals with large sizes were obtained first time through the Edge-defined Film Fed Growth (EFG) techniques by Arhipov et al [24]. The optical, luminescence and magnetic properties of CeAlO 3 were studied.…”