The phase diagram of the system ZrO2CaOMgO between 1200°C and 1700°C

Ferroelectric Sr3Zr2O7: Competition between Hybrid Improper Ferroelectric and Antiferroelectric Mechanisms

“…The RP phases of general formula A O( AB O 3 ) n (or A n +1 B n O 3 n +1 ) have a layered structure where n AB O 3 perovskite blocks are stacked along the [001] direction, with an extra A O rock salt layer inserted for every n perovskite units (see Figure for n = 2) . Although n = 2 RP Sr 3 Zr 2 O 7 was previously reported to adopt a centrosymmetric Pmmm symmetry, recent theoretical work and first‐principles calculations indicated that Sr 3 Zr 2 O 7 is a potential HIF with A 2 1 am symmetry . We first characterized the room‐temperature crystal structure of Sr 3 Zr 2 O 7 using SXRD and NPD.…”

Structural Properties and Thermal Stability of Ceria-Zirconia and Related Materials

“…As for the Ce0 2 -Zr0 2 is concerned, presence of three Ce0 2 -Zr0 2 phases is also observed at RT (Fig.6.2.). Despite the intense work on the definition of this phase diagram [1][2][3][4][5][6][7][8][9][10][11][12][13][14], its exact appearance is often matter of discussion. We adopt the phase classification suggested by Yashima et al [22][23][24], which further distinguishes the tetragonal phases into t, f and t" phases, according to the type of the tetragonal distortion and its nature, i.e.…”

Phase equilibrium diagram of the system ceria-yttria for temperatures between 900 and 1700° C

“…Previously reported results [1,2] have indicated that these materials could be successfully employed at high temperatures as semiconductors. Investigations have also been made of the system CeO:-ZrO~ [13,14], and of those ternary systems containing the two oxides mentioned and other high melting point oxides such as CaO [15], MgO [16], Al203 [17,18] and BeO [19]. Investigations have also been made of the system CeO:-ZrO~ [13,14], and of those ternary systems containing the two oxides mentioned and other high melting point oxides such as CaO [15], MgO [16], Al203 [17,18] and BeO [19].…”