As the application demands for electronic devices in extreme environments escalate steadily, multilayer ceramic capacitors (MLCCs) are imperative to withstand highly arduous operational conditions, including those encountered in desert oil exploration,hybrid electric vehicles,aerospace systems,and specialized military robotics.In this context,the development of dielectric ceramic materials characterized by a broad operational temperature spectrum,low sintering temperature,and superior dielectric performance has emerged as a pivotal challenge in driving the technological advancement of MLCCs.The 0.8Pb[(Fe2/3W1/3)1-xTix ]O3-0.2BiFeO3(x = 0,0.005,0.01,and 0.02) ceramics are synthesized using the solid-state reaction technique.Dense ceramic samples with pure perovskite structure are successfully obtained after sintering at a very low sintering temperature of 850 ℃.As x increases from 0 to 0.02,the room temperature dielectric permittivity (ε') increases slightly while the loss tangent (tan δ) decreases at 1 kHz,indicating the beneficial effects on the dielectric performance by Ti4+ doping.All samples maintain ΔC/C25℃ ≤±15% down to very low temperature.The composition with x=0.005 shows the widest temperature stability range of -130 ℃ to +85 ℃ at 1 kHz,and the dielectric loss is lower than 1% at room temperature,which well reaches the standard of the EIA X5R.This ceramic material with excellent temperature stability at ultra-low temperatures and an ultra-wide temperature range can not only match the cheap alloy Ag/Pd (where Ag≥70%) as the internal electrode to fabricate multilayer ceramic capacitors,which can greatly reduce the cost of ceramic capacitors,but also meet the requirements of a wider working temperature range and adapt to the changes of different environments.