Dielectric ceramic and its manufacturing method using the same, and a dielectric resonator

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PROBLEM TO BE SOLVED : To obtain dielectric ceramic which has high εr, and Q value, and has a small absolute value of temperature coefficient τf for resonance frequency. SOLUTION : The dielectric ceramic consists of a polycrystal body consisting of oxides containing at least rare earth elements (Ln), Al, M (M is Ca and/or Sr), and Ti as metallic elements, and contains prescribed amounts of Si, Fe and Zr.