We　investigate　entanglement　reciprocation　between　atomic　qubits　and　cavity　fields　initially　in　a　thermal　state.　We　show　that　the　entanglement　between　the　atomic　qubits　can　be　fully　transferred　to　the　mixed　fields　through　displacement　operation　and　resonant　atom-cavity　interaction.　This　is　a　rare　example,　in　which　quantum　systems　in　mixed　states　can　be　used　as　the　memory　for　entanglement.　The　entanglement　can　be　retrieved　by　another　atomic　pair.　Apart　from　fundamental　interest,　the　results　are　useful　for　implementation　of　quantum　networking　with　atom-field　interface　in　the　microwave　regime.