Sub-solidus relations in CaOBaOCuO with and without carboxyl contamination

Lin, Sern-Hau; Wu, Nae‐Lih

doi:10.1016/0921-4534(96)00167-0

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…This phase diagram is quite different from those reported to date. 7 The formation compositions, solubility ranges, and tie-line connections to other oxycarbonate phases that were formed at the regions that are labeled "85-3C" (hereafter called the 85-3C phase) and "21-C" (hereafter called the 21-C solid solution) in Fig. 1 were different from those reported by Lin et al 7 In the BaO(BaCO 3 )-CaO system, no binary compound was formed.…”

Section: Resultsmentioning

confidence: 90%

“…The formation composition and crystal structure of the 85-3C phase (Ba 8 Ca 16/15 Cu 64/15 ) 11.20 (CO 3 ) 2.66 ) was similar to that of Ba 8 Ca 1−x Cu 4 O 10−2x (CO 3 ) 3+x (where 0 Յ x Յ 0.35), which had P4/mmm symmetry and lattice parameters a ‫ס‬ 0.8117 nm and c ‫ס‬ 0.8121 nm. 7 However, according to detailed XRD results, we determined that the 85-3C phase was formed only at Ba:Ca:Cu ‫ס‬ 15:2:8. In the compositions that were reported by Lin et al, 7 the 21-C solid solution and the 85-3C phase coexisted.…”

Section: Resultsmentioning

confidence: 90%

“…7 However, according to detailed XRD results, we determined that the 85-3C phase was formed only at Ba:Ca:Cu ‫ס‬ 15:2:8. In the compositions that were reported by Lin et al, 7 the 21-C solid solution and the 85-3C phase coexisted. Figure 4 gives a HRTEM image and an ED pattern (inset) of the 85-3C phase, viewed down the [001] direction.…”

Section: Resultsmentioning

confidence: 99%

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Phase Diagram of the BaO(BaCO₃)‐CaO‐CuO System

Kusano

Kikuchi

Takada

et al. 1999

Journal of the American Ceramic Society

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The phase diagram of the BaO(BaCO 3 )-CaO-CuO system, especially in the barium-rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba 8 Ca 16/15 Cu 64/15 O 11.20 (CO 3 ) 2.66 and a solid-solution series with a chemical composition of Ba 2 Ca x+y Cu 1+(x/2)−y O 2+␦ (CO 3 ) 1−z (where 0 ≤ x ≤ 2/39 and 0 ≤ y ≤ 16 x/5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)-(39:1:20) -(65:7:28). The solid-solution structure had P4/mmm symmetry, with lattice parameters a ≈ a p and c ≈ 2 a p , where a p represents the perovskite cell. The Ba 8 Ca 16/15 Cu 64/15 O 11.20 (CO 3 ) 2.66 compound, which had Pm3m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical-solubility range.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 90%

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Phase Diagram of the BaO(BaCO₃)‐CaO‐CuO System

Kusano

Kikuchi

Takada

et al. 1999

Journal of the American Ceramic Society

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“…Because of the presence of CaCO 3 in the sample, attempts were made with Ba 4 CaCu 3 O 8+d replaced by one of the related oxycarbonate phases reported in the literature [8,[17][18][19] but remained unsuccessful. They systematically led to refinement instabilities and/or to unphysical occupational and displacement parameters and to large R factors.…”

Section: Structure Refinement Of Cubic and Tetragonal Ba 4 Cacu 3 O 8+dmentioning

confidence: 99%

“…The overall oxygen content, E10.5 per formula unit to be compared with 14 if all O sites were fully occupied, is due to a partial occupancy of the oxygen positions located in the equatorial plane of the (Cu,Ca)O 6 octahedra. A third ternary compound with composition Ba 2 CaCuO 4 was reported by Lin and Wu [7] but its diffraction pattern was later assigned to Ba 4 CaCu 2 O 7+d (CO 3 ) [8].…”

Section: Introductionmentioning

confidence: 96%