<p><b>亞鉻酸亞鐵</b>是離子化合物，化學式為FeCr<sub>2</sub>O<sub>4</sub>。
</p>


<h2><span id=".E5.88.B6.E5.A4.87"></span><span id="制备">製備</span></h2>
<ul><li>自然界中存在於鉻鐵礦，雖然有許多雜質。</li></ul><ul><li>高溫灼燒三氧化二鉻與氧化鐵：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {FeO+Cr_{2}O_{3}\ {\xrightarrow {1600^{o}C}}\ Fe(CrO_{2})_{2}}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {FeO+Cr_{2}O_{3}\ {\xrightarrow {1600^{o}C}}\ Fe(CrO_{2})_{2}}}}</annotation>
  </semantics></math></span></span></dd></dl><h2><span id=".E7.89.A9.E7.90.86.E6.80.A7.E8.B4.A8"></span><span id="物理性质">物理性質</span></h2>
<p>黑褐色立方晶體，空間群<i><b>F d3m</b></i>，其中<i>a</i> = 0.8374 nm，Z = 8。
</p>
<h2><span id=".E5.8C.96.E5.AD.A6.E6.80.A7.E8.B4.A8"></span><span id="化学性质">化學性質</span></h2>
<ul><li>與濃鹽酸反應：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+8HCl\ {\xrightarrow {}}\ 2CrCl_{3}+FeCl_{2}+4H_{2}O}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+8HCl\ {\xrightarrow {}}\ 2CrCl_{3}+FeCl_{2}+4H_{2}O}}}</annotation>
  </semantics></math></span></span></dd></dl><ul><li>與熱的濃硝酸反應：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+10HNO_{3}\ {\xrightarrow {}}\ 2Cr(NO_{3})_{3}+Fe(NO_{3})_{3}+NO_{2}\uparrow +5H_{2}O}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+10HNO_{3}\ {\xrightarrow {}}\ 2Cr(NO_{3})_{3}+Fe(NO_{3})_{3}+NO_{2}\uparrow +5H_{2}O}}}</annotation>
  </semantics></math></span></span></dd></dl><ul><li>在不活潑氣體保護下，緩慢溶於鹼中：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+6NaOH+4H_{2}O\ {\xrightarrow {\tau ,N_{2}}}\ 2Na_{3}[Cr(OH)_{6}]+Fe(OH)_{2}\downarrow }}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+6NaOH+4H_{2}O\ {\xrightarrow {\tau ,N_{2}}}\ 2Na_{3}[Cr(OH)_{6}]+Fe(OH)_{2}\downarrow }}}</annotation>
  </semantics></math></span></span></dd></dl><ul><li>在空氣中反應更快：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {4Fe(CrO_{2})_{2}+O_{2}+24NaOH+14H_{2}O\ {\xrightarrow {}}\ 8Na_{3}[Cr(OH)_{6}]+4FeO(OH)\downarrow }}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {4Fe(CrO_{2})_{2}+O_{2}+24NaOH+14H_{2}O\ {\xrightarrow {}}\ 8Na_{3}[Cr(OH)_{6}]+4FeO(OH)\downarrow }}}</annotation>
  </semantics></math></span></span></dd></dl><ul><li>被碳（焦炭）還原為鉻和鐵：</li></ul><dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+4C\ {\xrightarrow {1100-1200^{o}C}}\ [Fe+2Cr]+4CO}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\mathsf {Fe(CrO_{2})_{2}+4C\ {\xrightarrow {1100-1200^{o}C}}\ [Fe+2Cr]+4CO}}}</annotation>
  </semantics></math></span></span></dd></dl><h2><span id=".E7.94.A8.E9.80.94"></span><span id="用途">用途</span></h2>
<p>作為鉻的來源。</p>
<h2><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span><span id="参考文献">參考文獻</span></h2>

<ul><li><cite class="citation book">Редкол.: Зефиров Н.С. и др. (編). Химическая энциклопедия. 5. М.: Большая Российская энциклопедия. 1998: 783. <span title="國際標準書號">ISBN</span> 5-85270-310-9.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A%E4%BA%9A%E9%93%AC%E9%85%B8%E4%BA%9A%E9%93%81&amp;rft.au=%D0%A0%D0%B5%D0%B4%D0%BA%D0%BE%D0%BB.%3A+%D0%97%D0%B5%D1%84%D0%B8%D1%80%D0%BE%D0%B2+%D0%9D.%D0%A1.+%D0%B8+%D0%B4%D1%80.&amp;rft.btitle=%D0%A5%D0%B8%D0%BC%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%8D%D0%BD%D1%86%D0%B8%D0%BA%D0%BB%D0%BE%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F&amp;rft.date=1998&amp;rft.genre=book&amp;rft.isbn=5-85270-310-9&amp;rft.pages=783&amp;rft.place=%D0%9C.&amp;rft.pub=%D0%91%D0%BE%D0%BB%D1%8C%D1%88%D0%B0%D1%8F+%D0%A0%D0%BE%D1%81%D1%81%D0%B8%D0%B9%D1%81%D0%BA%D0%B0%D1%8F+%D1%8D%D0%BD%D1%86%D0%B8%D0%BA%D0%BB%D0%BE%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F&amp;rft.series=5&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook"><span> </span></span></li>
<li><cite class="citation book">Редкол.: Никольский Б.П. и др. (編). Справочник химика. 2 3-е изд., испр. Л.: Химия. 1971: 1168.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A%E4%BA%9A%E9%93%AC%E9%85%B8%E4%BA%9A%E9%93%81&amp;rft.au=%D0%A0%D0%B5%D0%B4%D0%BA%D0%BE%D0%BB.%3A+%D0%9D%D0%B8%D0%BA%D0%BE%D0%BB%D1%8C%D1%81%D0%BA%D0%B8%D0%B9+%D0%91.%D0%9F.+%D0%B8+%D0%B4%D1%80.&amp;rft.btitle=%D0%A1%D0%BF%D1%80%D0%B0%D0%B2%D0%BE%D1%87%D0%BD%D0%B8%D0%BA+%D1%85%D0%B8%D0%BC%D0%B8%D0%BA%D0%B0&amp;rft.date=1971&amp;rft.edition=3-%D0%B5+%D0%B8%D0%B7%D0%B4.%2C+%D0%B8%D1%81%D0%BF%D1%80&amp;rft.genre=book&amp;rft.pages=1168&amp;rft.place=%D0%9B.&amp;rft.pub=%D0%A5%D0%B8%D0%BC%D0%B8%D1%8F&amp;rft.series=2&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook"><span> </span></span></li>
<li><cite class="citation book">Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов 3-е изд., испр. М.: Химия. 2000: 480. <span title="國際標準書號">ISBN</span> 5-7245-1163-0.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A%E4%BA%9A%E9%93%AC%E9%85%B8%E4%BA%9A%E9%93%81&amp;rft.au=%D0%9B%D0%B8%D0%B4%D0%B8%D0%BD+%D0%A0.%D0%90.+%D0%B8+%D0%B4%D1%80.&amp;rft.btitle=%D0%A5%D0%B8%D0%BC%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B5+%D1%81%D0%B2%D0%BE%D0%B9%D1%81%D1%82%D0%B2%D0%B0+%D0%BD%D0%B5%D0%BE%D1%80%D0%B3%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D1%85+%D0%B2%D0%B5%D1%89%D0%B5%D1%81%D1%82%D0%B2%3A+%D0%A3%D1%87%D0%B5%D0%B1.+%D0%BF%D0%BE%D1%81%D0%BE%D0%B1%D0%B8%D0%B5+%D0%B4%D0%BB%D1%8F+%D0%B2%D1%83%D0%B7%D0%BE%D0%B2&amp;rft.date=2000&amp;rft.edition=3-%D0%B5+%D0%B8%D0%B7%D0%B4.%2C+%D0%B8%D1%81%D0%BF%D1%80&amp;rft.genre=book&amp;rft.isbn=5-7245-1163-0&amp;rft.pages=480&amp;rft.place=%D0%9C.&amp;rft.pub=%D0%A5%D0%B8%D0%BC%D0%B8%D1%8F&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook"><span> </span></span></li>
<li><cite class="citation book">Рипан Р., Четяну И. Неорганическая химия. Химия металлов. 2. М.: Мир. 1972: 871.</cite><span title="ctx_ver=Z39.88-2004&amp;rfr_id=info%3Asid%2Fzh.wikipedia.org%3A%E4%BA%9A%E9%93%AC%E9%85%B8%E4%BA%9A%E9%93%81&amp;rft.au=%D0%A0%D0%B8%D0%BF%D0%B0%D0%BD+%D0%A0.%2C+%D0%A7%D0%B5%D1%82%D1%8F%D0%BD%D1%83+%D0%98.&amp;rft.btitle=%D0%9D%D0%B5%D0%BE%D1%80%D0%B3%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%85%D0%B8%D0%BC%D0%B8%D1%8F.+%D0%A5%D0%B8%D0%BC%D0%B8%D1%8F+%D0%BC%D0%B5%D1%82%D0%B0%D0%BB%D0%BB%D0%BE%D0%B2&amp;rft.date=1972&amp;rft.genre=book&amp;rft.pages=871&amp;rft.place=%D0%9C.&amp;rft.pub=%D0%9C%D0%B8%D1%80&amp;rft.series=2&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook"><span> </span></span></li></ul><!-- 
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**亞鉻酸亞鐵**是離子化合物，化學式為 FeCr2O4。

## 製備

* 自然界中存在於鉻鐵礦，雖然有許多雜質。
* 高溫灼燒三氧化二鉻與氧化鐵：

　
: ${\mathsf {FeO+Cr_{2}O_{3}\ {\xrightarrow {1600^{o}C}}\ Fe(CrO_{2})_{2}}}$

## 物理性質

黑褐色立方晶體，空間群_**F d3m**_，其中 _a_ = 0.8374 nm，Z = 8。

## 化學性質

* 與濃鹽酸反應：

　
: ${\mathsf {Fe(CrO_{2})_{2}+8HCl\ {\xrightarrow {}}\ 2CrCl_{3}+FeCl_{2}+4H_{2}O}}$

* 與熱的濃硝酸反應：

　
: ${\mathsf {Fe(CrO_{2})_{2}+10HNO_{3}\ {\xrightarrow {}}\ 2Cr(NO_{3})_{3}+Fe(NO_{3})_{3}+NO_{2}\uparrow +5H_{2}O}}$

* 在不活潑氣體保護下，緩慢溶於鹼中：

　
: ${\mathsf {Fe(CrO_{2})_{2}+6NaOH+4H_{2}O\ {\xrightarrow {\tau ,N_{2}}}\ 2Na_{3}[Cr(OH)_{6}]+Fe(OH)_{2}\downarrow }}$

* 在空氣中反應更快：

　
: ${\mathsf {4Fe(CrO_{2})_{2}+O_{2}+24NaOH+14H_{2}O\ {\xrightarrow {}}\ 8Na_{3}[Cr(OH)_{6}]+4FeO(OH)\downarrow }}$

* 被碳（焦炭）還原為鉻和鐵：

　
: ${\mathsf {Fe(CrO_{2})_{2}+4C\ {\xrightarrow {1100-1200^{o}C}}\ [Fe+2Cr]+4CO}}$

## 用途

作為鉻的來源。

## 參考文獻

* Редкол.: Зефиров Н.С. и др. (編). Химическая энциклопедия. 5. М.: Большая Российская энциклопедия. 1998: 783. ISBN 5-85270-310-9.
* Редкол.: Никольский Б.П. и др. (編). Справочник химика. 2 3-е изд., испр. Л.: Химия. 1971: 1168.
* Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов 3-е изд., испр. М.: Химия. 2000: 480. ISBN 5-7245-1163-0.
* Рипан Р., Четяну И. Неорганическая химия. Химия металлов. 2. М.: Мир. 1972: 871.
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