Synthesis, structural, electrical and thermal properties of Ti-doped Bi2Sn2O7 pyrochlore

Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores

“…[17][18][19] Here in this work we demonstrate that the microwave (MW) -assisted method produces off-equilibrium (metastable) pyrochlore-type phases with varying amounts of anti-site defects, in agreement with other more recently developed alternative synthesis methods, e.g. [20][21][22] In the last decades several alternative routes have been proposed such as microwave (MW) synthesis, molten salt mediated synthesis, co-precipitation of hydroxides, sol-gel and citrate based methods, and mechanical milling, where the time and temperature requirements for synthesis are significantly reduced. 19 Traditionally, RE 2 Ti 2 O 7 compounds are prepared by solid state reactions, which require repeated and long synthesis procedures at temperatures of up to ≈ 1400 ºC and intensive grinding at the initial and intermediate stages of processing to achieve single phase material.…”

“…This is not surprising since the preparation of pyrochlore oxides by traditional solid-state reaction from a mixture of oxides commonly requires repeated grinding and long heating cycles at temperatures higher than 1200 C to achieve complete reaction. [20][21][22] Thus, we can conrm that the use of microwave heating is useful to reduce the reaction time, temperature and costs for the synthesis of RE-titanate pyrochlores.…”

“…19 Traditionally, RE 2 Ti 2 O 7 compounds are prepared by solid state reactions, which require repeated and long synthesis procedures at temperatures of up to z1400 C and intensive grinding at the initial and intermediate stages of processing to achieve single phase material. [20][21][22] In the last decades several alternative routes have been proposed such as microwave (MW) synthesis, molten salt mediated synthesis, coprecipitation of hydroxides, sol-gel and citrate based methods, and mechanical milling, where the time and temperature requirements for synthesis are signicantly reduced. 19,[23][24][25][26] However, these methods usually require a second calcination step in a conventional furnace to obtain phase pure materials and the total reaction time increases.…”

Synthesis, Structural, Electrical and Thermal Properties of ScFeO<sub>3</sub> Ceramic

“…It is based on the first law of thermodynamics which expresses the principle of conservation of energy i.e., when heat is absorbed by a system under specified conditions such as constant pressure, the heat energy of that system changes [26]. The amount of heat absorbed by the material in the temperature range 1062K to 1108K was calculated using the equation …”

Phase relations in the Bi2O3-SnO2 system and thermodynamic properties of bismuth pyrostannate

“…In addition, its heat capacity was determined experimentally by differential scan ning calorimetry (DSC) (300-1000 K). Roy et al [19] reported the heat capacity of Bi 2 Sn 2 O 7 in the temper ature range 523-843 K [19].…”