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The complex phenomenology of shot quenched YBa2Cu3O6.5 with Tc=100K and 200Klevels is compared with laser pulsed analogs with an eye on explaining thepresumed Tc=552K of the latter. Shot quenching can produce metastable stateswith pronounced increases in plane metric and cell volume, accompanied by arough doubling of Tc to a 100K level of an orthorhombic with 3-fold Ocoordinated chain Cu (O3 type). These states decay over a non-superconductingtransition range to the conventional Tc=50K level of O24. We consider the planeexpanded laser pulsed materials to contain aspects of O42 plane n-dopedcounterparts of the O3 n-doped version of shot quench preparations. Inaddition, we assume that highly charged p-doped chains of 4-fold O coordinationform hole pairs at trijugate position, allowing close approach of the apical Oto the electron-doped planes. They are now capable of participating in thebonding with the plane pairs at corresponding 3a0/2 location. The overall pairnumber is therefore multiplied, and the coupling strengthened, by limited 3-Deffects within the Plane-Chain-Plane sandwich. The latter can be seen as anextended chemical bonding system that has the potential to equilibratecontractive and expansive pairs and so obviate the need for distinction ofdoping type as it may exchange it dynamically. It is argued that indicationsfor a Tc=200K level on shot quenching has a related origin and represents onein series of predicted Tc levels based on bond order principles. Predictionsare made where similar effects can be expected in other compound classes.

Elevated Tc levels in YBa2Cu3O6.5 modeled on a 3-dimensional doped bond structure of chain and plane pairs