Preparation, characterization and electrical properties of Ca and Sr doped LaCrO3

Dielectric and photoluminescence properties of fine-grained BaTiO3 ceramics co-doped with amphoteric Sm and valence-variable Cr

“…Qi indicated that when the acceptordoped samples were prepared under air condition, due to enough oxygen existence and on the basis of charge balance, the Cr 3+ (3d 3 ) can be partly oxidized to form Cr 5+ (3d 1 ). 30 Our results conrmed that mixed valence states of Cr 3+ /Cr 5+ /Cr 6+ existed in BSTC and BSTC1. In addition, one encouraging note is that the reduction in Cr concentration by 1% for BSTC1 compared to BSTC induced a regular diffuse phase transition (DPT) behavior.…”

“…Binding energy of 576.7, 577.6 and 579.1 eV was responding to the Cr 3+ , Cr 5+ and Cr 6+ , respectively. 30,41 Two additional peaks at 582.1 eV and 591.8 eV originated from satellite peak of Cr 3+ . 42 When the samples were prepared under air condition, due to enough oxygen existence, the Cr 3+ (3d 3 ) can be partly oxidized to form Cr 5+ (3d 1 ) or Cr 6+ (3d 0 ) (Cr 4+ (3d 2 ) is not stable and prone to be oxidized to Cr 5+ or Cr 6+ ), three valence states of Cr can together exist in the compounds of BSTC and BSTC1.…”

“…3,31,32 Some blue deposits on the bottom of Al 2 O 3 crucible in the process of sintering could be because Cr 6+ can combine O 2À to constitute the CrO 3 , which volatilizes at high temperature condition. 30,33 The EDXS of BSTC and BSTC1 with x ¼ 0.05 are performed to detect the actual ratio of Sm to Cr (Fig. 4).…”

The role of ruthenium in perovskite-type mixed oxide in the electrochemical degradation of 4-nitrophenol

“…LSCr b) LSCrRu, p-perovskit; s-SrCrO4 Pojava faza koje sedrže hrom u višem valentnom stanju, zapažena je kod perovskita formiranih žarenjem u vazduhu na temperaturama nižim od 1200°C [5]. Prisustvo faze SrCrO4 je ustanovljeno i kod LSCr i LSCrRu uzoraka, što pokazuje da se ova faza formira nezavisno od prisustva Ru.…”

Synthesis of LnCrO3 perovskites and their color properties

“…Lanthanide chromite with perovskite structure, exhibits high mechanical and chemical stability, high electric conductivity for use in SOFC, oxygen sensors, ionic conductors and catalytic activity for the oxidation reaction [3][4][5][6][7][8][9]. However, their optical properties have not yet been studied.…”