Microstructural evolution in BaO–Y2O3–Co3O4 mixtures during high-energy milling and its role in the formation of YxBa1−xCoO3−δ and YBaCo4O7

Magnetization, Mössbauer and isothermal dilatometric behavior of oxidized YBa(Co,Fe)4O7+δ

“…No phase changes with time were observed above 1200 K. At 1173 K the decomposition products include Co 3 O 4 and, most likely, perovskite-like solid solutions based on cubic BaCoO 3-d (S.G. Pm3m) and orthorhombic YCoO 3-d (Pnma). The results agree well with the report 30 showing that the formation of YBaCo 4 O 7+d phase can be achieved at 1173 K. For further evaluation of the stability limits and chemical strains due to oxidation at atmospheric oxygen pressure (see Fig. 2), XRPD patterns were collected on temperature cycling between 298 and 773 K and between 473 and 1373 K, with another single-phase YBaCo 4 O 7 sample preliminarily annealed in air at 1473 K for 22 h. The ratio of the refined unit cell parameters (c/a) is shown in Fig.…”

The YBaCo4O7+δ‐Based Functional Oxide Material Family: A Review

“…[38] Another option is to utilize sol-gel methods for the synthesis of YBaCo 4 O 7 , the advantage being the same as in the case of careful ball-milling, that is, phase-pure samples can be obtained at lower temperatures (ca. [38] Another option is to utilize sol-gel methods for the synthesis of YBaCo 4 O 7 , the advantage being the same as in the case of careful ball-milling, that is, phase-pure samples can be obtained at lower temperatures (ca.…”

Mechanosynthesis of β-Cr2N using BN as the nitrogen source

“…Therefore, the search for new methodologies is of great importance. High-energy ball-milling has proven to be a powerful technique for obtaining materials such as nitrides, carbides, borides, intermetallic and metastable phases [37][38][39][40][41][42][43][44]. Ball-milling has advantages such as easy operation, easy to scale industrially, short processing times, and that it could produce nanostructured powders.…”