一氧化锰(以下简称 MnO_2)有许多种类的天然矿石以及化学地或电化学地制造的人工品种,这些品种的各种物理的、化学的以及电化学的性质,有显著差异。对种种 MnO_2 的物理性质,特别是晶体结构,有许多研究结果的报导,这是因为 MnO_2 的晶体结构与干电池的去极性能有密切关系。本文介绍日本研究者所发表的主要文章。 Manganese monoxide (hereinafter referred to as MnO 2 ) has many kinds of natural ores as well as chemically or electrochemically manufactured artificial varieties, and there are significant differences in various physical, chemical, and electrochemical properties of these varieties. There are many reports on the physical properties of various MnO 2 , especially the crystal structure. This is because the crystal structure of MnO 2 is closely related to the depolarization performance of the dry cell. This article describes the main articles published by Japanese researchers.