A neutron diffraction study of the temperature dependence of Ca2Fe2O5

Influence of Phase Transformations on Crystal Growth of Stoichiometric Brownmillerite Oxides: Sr2ScGaO5 and Ca2Fe2O5

“…The applied growth conditions reported in [28] yielded a Ca2Fe2O5 single-crystal (CFO) of 6 mm in diameter and 120 mm in length, showing a shiny silver-black surface with metallic lustre, as shown in Figure 7. Powder diffraction carried out on crushed parts of the as-grown single crystals yielded lattice parameters of a = 5.4272(4) Å, b = 14.7640(1) Å, and c = 5.59724(4) Å, in very good agreement with previous reports [12,28,29]. The corresponding XRD pattern is shown in Figure 8a.…”

“…Ca 2 Fe 2 O 5 is congruently melting [27,28], which significantly helps for the single crystal growth. The applied growth conditions reported in [28] [12,28,29]. The corresponding XRD pattern is shown in Figure 8a.…”

Effects of Gibbsite, Kaolinite and Al-rich Goethite as Alumina Sources on Silico-Ferrite of Calcium and Aluminium (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation

“…31) The crystal structure data of 2,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] were used for Fe 2 O 3 , CaCO 3 , Al(OH) 3 , α-SiO 2 , Al 2 Si 2 O 5 (OH) 4 , FeOOH, β-SiO 2 , CaO, C 2 F, Ca 2 Al 2 SiO 7 , CF, CFA, γ-CFF, SFCA-I, SFCA and Fe 3 O 4 , respectively. The use of the QPA algorithm embodied in TOPAS returns relative, rather than absolute, concentrations for crystalline phases in a system if amorphous material, including melt phases, are present.…”

Temperature Dependence of the Magnetic and Electric Properties of Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>

“…The iron end-member CF [4,5] (mineral name srebrodolskite) adopts space group Pnma at ambient conditions (a = 5.4, b = 14.8, c = 5.6 Ǻ). Their magnetic structures and properties have been investigated by many authors [6][7][8][9][10][11][12]. Physical properties of CF, such as electronic and oxygen-ionic transport [13] and catalytic [14] and photo catalytic [15] behavior, have been studied.…”

“…Mixed occupations are observed frequently. Two phase transitions are known for the iron end-member CF: the loss of the antiferromagnetic order at the Neel temperature at 720K [7][8][9]20] and a structural phase transition [12,[20][21][22] at 950K. The high-temperature phases of the end-members Ca 2 Fe 2 O 5 and Ca 2 Al 2 O 5 turned out to be isotypic modulated structures [6,23], with an aperiodic sequence of tetrahedral chains.…”