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The distance of apical O to planes, d, is introduced as serving as an arbiterin the dispute between different local O coordination (n) in determining chargeequilibration in YBa2Cu3Oy. We assign reported cell volume and plane expansion(V+P+) on shot quenching (SQ) from above 600K to O- connected with (3) at acritical cluster size for increased d, maximizing at 673K and y=6.44. This anda Tc=100K level is ascribed to self-doped apical O-, acting as a plane reducerand expander (P+). By contrast, slow cooling to 260K produces conventional cellvolume contracted varieties (V-P-), based on plane oxidizing (4) with its smalld=2.3A at a Tc=50K level. V+P+ to V-P- transformation is slow due to electronicrearrangement involving O-, compared to the primarily structural one within V-.A SQ minority at Tc=200K* level and related effects observed on laser pulsing(for y=6.5 Tc=552K*), termed as elevated temperature superconductivity (ETS),are also explained as due to plane expanding n-doping. We assume that central(2) connect p-doped pairs in the bonds of both apical O- with plane Cu, in linewith retrograde increases in Tc with increasing %(2). 3-D superconductivity isa result of d now being comparable to plane dimensions.

Self-doped apical O- can lead to plane expansion and/or proposed 3-D superconductivity in YBa2Cu3Oy