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还有化学退火的方法，即用尺寸大30%的钾离子取代表面的钠离子。
In chemical tempering, sodium ions in the surface are replaced with potassium ions, which are about 30 percent larger.
综述了离子取代与六角铁氧体结构、静磁特性、微波吸收性能的关系。
The influences of ionic substitution on the structure, static magnetic characteristics and microwave absorption properties of hexaferrite were summarized in detail.
由于人工软化水采用钠离子取代镁离子和钙离子，因此具有极强的腐蚀作用。
Artificially softened water is exceedingly corrosive because the process substitutes sodium ions for magnesium and calcium ions.
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