Phase equilibria in the CaO–Nb2O5 system up to 1600 °C: New experimental results

Design of highly sensitive and selective ethanol sensor based on α-Fe2O3/Nb2O5 heterostructure

“…Owing to the exclusive physical and chemical features of Fe 2 O 3 and Nb 2 O 5 , they have been considered as attractive TMO candidates in the field of gas sensing [29,30]. Their features of non-toxicity, low cost, abundance, environmental friendliness, chemical inertness, high magnetism and resistance to corrosion have made them effective candidates in various fields [8,30,31].…”

“…In particular, n-type hematite (α-Fe 2 O 3 ) with a low 2.0-2.3 eV energy band gap is considered a good candidate for ethanol gas sensors [8,30]. On the other side, the high operating temperature, slow recovery, low sensitivity and long response time of hematite restricts its gas-sensing application [29]. Similarly, n-type Nb 2 O 5 with a wide energy band gap of 3.2-4.0 eV is thermodynamically stable but at the same time Nb 2 O 5 possesses a poor electric conductivity (σ∼3×10 −6 S cm −1 ) and is a less-studied material for use in ethanol sensors [31][32][33].…”

Adjacent relations of primary phase fields and invariant reactions of the system CaO‐SiO2‐Nb2O5‐La2O3

“…As described in the previous work, 8 the phase diagram of CaO‐SiO 2 ‐Nb 2 O 5 ‐La 2 O 3 quaternary system is important for the utilization of Nb and rare earth resources. So far, only the related sub‐binary phase diagrams and part of some sub‐ternary phase diagrams have been studied: including the La 2 O 3 ‐SiO 2 , 9 La 2 O 3 ‐CaO, 10 SiO 2 ‐CaO, 11 CaO‐Nb 2 O 5 , 12 Nb 2 O 5 ‐SiO 2 , 13 CaO‐SiO 2 ‐Nb 2 O 5 , 14 CaO‐SiO 2 ‐La 2 O 3 , 15 and CaO‐La 2 O 3 ‐Nb 2 O 5 16,17 systems. For the CaO‐SiO 2 ‐Nb 2 O 5 ‐La 2 O 3 quaternary system, only the phase equilibria of low w (La 2 O 3 ) region have been studied in the author's previous work 18,19 —the coexistence of Nb 2 O 5 and La 2 O 3 makes the phase equilibria more complicated than any sub‐binary or sub‐ternary systems.…”