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|Section2= |Section3= |Section7= |Section8= }} Vanadium(IV) oxide is the inorganic compound with the formula VO2. It is a dark blue solid. Vanadium(IV) oxide is amphoteric, dissolving in non-oxidising acids to give the blue vanadyl ion, ()2+ and in alkali to give the brown ()2− ion, or at high pH ()4−. ==Synthesis and structure== Following the method described by Berzelius, is prepared by comproportionation of vanadium(III) oxide and vanadium(V) oxide:〔Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1267.〕 : + → 4 At room temperature VO2 has a distorted rutile structure with shorter distances between pairs of V atoms indicating metal-metal bonding. Above 68 °C the structure changes to an undistorted rutile structure and the metal-metal bonds are broken causing an increase in electrical conductivity and magnetic susceptibility as the bonding electrons are "released".〔 〔http://phys.org/news/2015-04-insulator-to-metal-transition-vanadium-dioxide.html〕 The origin of this insulator to metal transition remains controversial and is of interest in condensed matter physics. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vanadium(IV) oxide」の詳細全文を読む スポンサード リンク
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