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首次测量了ＧｄＣａ_４Ｏ（ＢＯ_3）_3晶体的全部介电常数、压电应变常数和部分机电耦合系数。
The total dielectric constant, piezoelectric strain constant and partial electromechanical coupling coefficient of GdCa_4O (BO_3) _3 crystal were measured for the first time.