SILVER OXIDE AND ITS PRODUCTION METHOD

To provide a novel silver oxide.SOLUTION: A method for producing silver oxide includes: spending about 5 minutes to mix 707.5 g (1.2 mol time of reaction equivalent) of 0.4 mass% aqueous sodium hydroxide solution with 200 g of 5.0 mass% aqueous silver nitrate solution, and then leaving the resultant solution unattended for 15 minutes to obtain a mixture; subjecting a mixed material to decantation cleaning to neutralize the mixture; heating a slurry at 100°C for 5 hours to obtain a silver oxide powder (having an average particle diameter of about 4 μm); shaping the silver oxide powder temporarily through uniaxial pressing, and then subjecting the shaped object to cold isostatic pressing (at the pressure of 150 MPa for 4 minutes) to make the resultant object into a pellet shape (having a diameter of about 16 mm and a thickness of about 3 mm); putting the pellets into a Teflon-lining autoclave having a sample rest provided not to contact a solution, and then heating the pellets at 150-200°C; and cleaning the pellets with dilute nitric acid (having concentration of 3.0 mass%) for 30 seconds after the heat treatment to obtain a pellet-shaped silver oxide. The (surface of) obtained silver oxide has a hole of about 4-5 μm, and has an open pore rate of 17% or more, preferably 18-25%.SELECTED DRAWING: Figure 2 【課題】新規な酸化銀の提供。【解決手段】濃度５．０質量％硝酸銀水溶液２００ｇに、濃度０．４質量％の水酸化ナトリウム水溶液７０７．５ｇ（反応当量の１．２モル倍）を約５分かけて混合し、１５分間放置し、混合物を得て、デカンテーション洗浄により中性にし、スラリーを１００℃で５時間処理し、酸化銀の粉末（平均粒径約４μｍ）を得て、酸化銀粉末を、一軸加圧により仮成形後、冷間等方圧加圧（圧力１５０ＭＰａ、４分）により、ペレット状（直径約１６ｍｍ、厚さ約３ｍｍ）に成形し、ペレットを、溶液と接しない様に試料台を設けたテフロン内張オートクレーブに入れ、１５０〜２００°Ｃで熱処理を行い、熱処理後、希硝酸（濃度３．０質量％）にて３０秒間洗浄し、ペレット状の酸化銀を得て、得られた酸化銀（の表面）には、４〜５μｍ程度の空孔を有し、１７％以上、好ましくは１８〜２５％の開気孔率となる酸化銀の製造方法。【選択図】図２