In this paper, a phase field system of Penrose-Fife type with nonconserved
order parameter is considered. A class of time-discrete schemes for an init
ial-boundary value problem for this phase-field system is presented. In thr
ee space dimensions, convergence is proved and an error estimate linear wit
h respect to the time-step size is derived. AMS Subject Classification. 65M
12, 35K50, 80A22, 35K60, 35R35, 65M15.