Perovskite-like rare earth gallium oxides prepared at atmospheric pressure

Twinning of LaGaO3single crystals

“…Division of an image into A, A', B and B' components for orthorhombic and rhombohedral phases may be interpreted as cross-twinning in the {100} and {110} systems simultaneously. ** The observed phase transition 'orthorhombic-rhombohedral' at 412.5 K contradicts the suggestion that a similar phase transition occurs at T= 1148 K (Geller, Curlander & Ruse, 1974;Geller & Raccah, 1970). Additional work is required to prove this.…”

“…According to Geller, Curlander & Ruse (1974), under conventional conditions it has an orthorhombic unit cell with a = 5.519, b = 5.494, c = 7.770A. Some papers describe a phase transition to a rhombohedral phase at 1148 K (Geller, Curlander & Ruse, 1974;Geller & Raccah, 1970).…”

Rare Earth Doped Gallium Gadolinium Orthogallate Films Prepared by Pulsed Laser Deposition

“…The rare-earth orthogallates (ReGaO 3 ) are the most intriguing among the perovskite-like ABO 3 compounds. They normally must be synthesized under conditions which differ from those used for the other ReBO 3 perovskite compound (B=Fe, Al, Cr etc.)…”

“…However the growing of the rare-earth orthogallate (ReGaO 3 ) is very difficult due to the fact that in oxide compounds the Ga 3+ cation has a strong preference for tetrahedral coordination and in the perovskite structure they are all octahedral. The perovskite GdGaO 3 have been obtained either by decomposition of the Gd 3 Ga 5 O 12 (GGG) garnet at high pressure (45 kbars) and at high temperature around 1000°C in presence of flux [2] or by overheating of the 0.5 Gd 2 O 3 -0.5 Ga 2 O 3 liquid mixture to 1900°C by using a CO 2 laser [3,4]. Because of the perovskite phase being difficult to obtain, only a few works have been presented about the preparation and properties of GdGaO 3 crystal, see e.g.…”

“…Because of the perovskite phase being difficult to obtain, only a few works have been presented about the preparation and properties of GdGaO 3 crystal, see e.g. [1][2][3][4][5]. Moreover the doping of this crystal by rare-earth and thin film fabrication up to now have not been presented.…”