Vacuum sintering of highly transparent La1.28Yb1.28Zr2O7.84 ceramic using nanosized raw powders

High‐entropy transparent ceramics: Review of potential candidates and recently studied cases

“…Figure 9 shows some reported dual‐phase solid solution transparent A 2 B 2 O 7 ceramics, including XRD patterns, back‐scattered electrons (BSEs) images of the thermally etched surface, secondary electrons (SE) images of the fracture surfaces, and in‐line transmittances. Both the XRD and BSE images confirm that two phases co‐exist in these solid solution transparent ceramics 98–100 …”

“…At the same time, the small grain size and fully densified structure, without residual pores, led to higher transmittance as shown in Figure 10D. More recently, non‐stoichiometric dual‐phase transparent A 2 B 2 O 7 ceramics, such as La 1.28 Er 1.28 Zr 2 O 7.84 98 and La 1.28 Yb 1.28 Zr 2 O 7.84 , were also demonstrated 99 . According to Subramanian's theory, the dual phase in both La 1.28 Er 1.28 Zr 2 O 7.84 and La 1.28 Yb 1.28 Zr 2 O 7.84 should be defective fluoride phase due to the small cationic radii of Er 3+ and Yb 3+ .…”

“…XRD pattern, back‐scattered electron (BSE) image of the thermally etched surface, secondary electron image of the fracture surface, and in‐line transmittance of the dual‐phase solid solution transparent A 2 B 2 O 7 ceramics (A) La 1.28 Er 1.28 Zr 2 O 7.84 , 98 (B) LaLuZr 2 O 7 , 100 and (C) La 1.28 Yb 1.28 Zr 2 O 7.84 99 . Reproduced with permission…”

“…This revelation required a new theory to explain cationic radius rules to determine phases in the case of non‐stoichiometric A 2 B 2 O 7 ceramics 98 . These two transparent ceramics were proposed for potential applications in the fields of lasers and computed tomography (CT) and magnetic resonance imaging (MRI) labeling 98,99 …”

Fabrication and Optical Properties of Er 2-x Yb x Zr 2 O 7 Transparent Ceramics

“…Pyrochlore ceramics exhibit the advantages of high melting point, good chemical stability, good ionic conductivity, low thermal conductivity and high catalytic activity. Therefore, these compounds exhibit various application prospects, such as thermal barrier coatings, solid oxide fuel cells, catalysts, scintillator matrix materials, nuclear waste solidification, solid laser materials and other fields [1][2][3][4][5][6]. The general formula of pyrochlore is A2B2O7, in which A is generally trivalent cation (lanthanide element and Y element) while B is tetravalent cation (usually Zr, Hf, Ti) [7][8][9][10][11].…”