chinese acad sci, inst solid state phys, internal frict & defects solids lab, hefei 230031, peoples r china. chinese acad sci, inst met res, state key lab rsa, shenyang 110015, peoples r china.;cai, b (reprint author), chinese acad sci, inst solid state phys, internal frict & defects solids lab, hefei 230031, peoples r china
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