Crystal chemistry and phase equilibria of selected SrO–R2O3–CuO and related systems; R=lanthanides and yttrium

Subsolidus phase relations of the SrO–Er2O3–CuO system

“…However, in order to obtain further information on the crystal chemistry of the alkaline-earth lanthanide cuprates, and possibly discover new superconductors, the phase equilibria of several SrO-Ln x O y -CuO systems have been determined during the last few years. These are the ones involving: Y 2 O 3 [3][4][5], La 2 O 3 [6], Nd 2 O 3 [7], Sm 2 O 3 [8], Eu 2 O 3 [9], Gd 2 O 3 [10], Dy 2 O 3 [11], Ho 2 O 3 [12], Tm 2 O 3 [13] and Yb 2 O 3 [14].…”

Subsolidus phase relations of the SrO–RE2O3–CuO systems (RE=Tm, Lu and Sc)

“…According to indications presented in [9], the SrO-Lu 2 O 3 -CuO system probably has a structure similar to that of the Er 2 O 3 , Yb 2 O 3 and Tm 2 O 3 containing systems. In the present work, we have studied this phase diagram in order to complete the knowledge of phase equilibria in the SrO-RE 2 O 3 -CuO systems.…”

“…The published phase diagrams are those involving Y 2 O 3 [1][2][3], La 2 O 3 [4], Nd 2 O 3 [5], Sm 2 O 3 [6], Eu 2 O 3 [7], Gd 2 O 3 [8], Dy 2 O 3 [9], Ho 2 O 3 [10], Er 2 O 3 [11], Tm 2 O 3 [12] and Yb 2 O 3 [13]. These systems were usually investigated in air at 900 • C-950 • C, where the full section is in the solid state.…”

“…However, Wong-Ng et al [9] indicate that some Tm can substitute for Sr. Furthermore, the nominal compositions used in [12] do not include samples between Sr 14 Cu 24 O 41−δ and Sr 12 Tm 2 Cu 24 O 41−δ , we performed a new study of the SrO-Tm 2 O 3 -CuO system to check this anomaly.…”

Subsolidus Phase Relations of the SrO-In2O3-CuO System in Air

“…The structure of this ternary section is similar to that of the SrO-RE 2 O 3 -CuO systems where RE = Sc, Y, Lu, Yb, Tm and Er. [33][34][35][36][37] A general trend of the SrO-Ln 2 O 3 -CuO (Ln = lanthanide) is that the solubility of the lanthanide element in the Sr 14 Cu 24 O 41 phase decreases as the Ln 3+ ion radius decreases. [38] The radius of the In 3+ ion is smaller than that of Lu 3+ .…”