Micron Document
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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Radiumbromid</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><table class="wikitable infobox float-right" id="Vorlage_Infobox_Chemikalie" style="font-size:90%; margin-top:0; width:350px;" summary="Infobox Chemikalie">

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<th colspan="2" style="background:#FFDEAD; color:#202122;">Kristallstruktur
</th></tr>
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<td colspan="2" class="hintergrundfarbe-basis" style="text-align:center;"><span typeof="mw:File"></span>
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<td colspan="2" style="text-align:center; font-size:80%;"><span style="background:#C0C0C0;border-radius: 12px;color: transparent; width: 12px; line-height:12px;display:inline-block;">_</span> <a href="Radium" title="Radium">Ra</a><sup>2+</sup> <span style="visibility:hidden;">0</span> <span style="background:#00FF00;border-radius: 12px;color: transparent; width: 12px; line-height:12px;display:inline-block;">_</span> <a href="Brom" title="Brom">Br</a><sup>−</sup>
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<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Allgemeines
</th></tr>
<tr>
<td style="width:33%;">Name
</td>
<td>Radiumbromid
</td></tr>


<tr>
<td><a href="Verh%C3%A4ltnisformel" title="Verhältnisformel">Verhältnisformel</a>
</td>
<td>RaBr<sub>2</sub>
</td></tr>
<tr>
<td>Kurzbeschreibung
</td>
<td>
<p>weißer Feststoff<sup id="cite_ref-Kirby_1-0" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
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<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Externe Identifikatoren/Datenbanken
</th></tr>
<tr>
<td colspan="2" style="padding:0;">
<table class="mw-collapsible mw-collapsed wikitable" data-expandtext="+" data-collapsetext="−" style="border-top:none; margin:-1px; width:calc(100% + 2px);">

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<td style="width:33%;"><a href="CAS-Nummer" title="CAS-Nummer">CAS-Nummer</a>
</td>
<td><span title="Untervorlage eingebunden: CASRN"></span><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=10031-23-9">10031-23-9</a><span class="editoronly" style="display:none;"></span>
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<td style="background:#FFDEAD; color:#202122; border-top:1px solid #FFDEAD; padding:0.2em 0; vertical-align:bottom; width:5%;">
</td></tr>
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<td><a href="EG-Nummer" title="EG-Nummer">EG-Nummer</a>
</td>
<td colspan="2">233-086-5
</td></tr>
<tr>
<td><a href="Europ%C3%A4ische_Chemikalienagentur" title="Europäische Chemikalienagentur">ECHA</a>-InfoCard
</td>
<td colspan="2"><a rel="nofollow" class="external text" href="https://www.echa.europa.eu/de/substance-information/-/substanceinfo/100.030.066">100.030.066</a>
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<td style="border-right:1px solid #a2a9b1;"><a href="Wikidata" title="Wikidata">Wikidata</a>
</td>
<td colspan="2"><a href="https://www.wikidata.org/wiki/Q2653992" class="extiw external" title="d:Q2653992">Q2653992</a>
</td></tr></tbody></table>
</td></tr>








<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Eigenschaften
</th></tr>
<tr>
<td><a href="Molare_Masse" title="Molare Masse">Molare Masse</a>
</td>
<td>385,83 g·<a href="Mol" title="Mol">mol</a><sup>−1</sup>
</td></tr>
<tr>
<td><a href="Aggregatzustand" title="Aggregatzustand">Aggregatzustand</a>
</td>
<td>
<p>fest<sup id="cite_ref-Kirby_1-1" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td><a href="Dichte" title="Dichte">Dichte</a>
</td>
<td>
<p>5,78 g·cm<sup>−3</sup><sup id="cite_ref-Kirby_1-2" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
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<td><a href="Schmelzpunkt" title="Schmelzpunkt">Schmelzpunkt</a>
</td>
<td>
<p>728 <a href="Grad_Celsius" title="Grad Celsius">°C</a><sup id="cite_ref-Kirby_1-3" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>








<tr>
<td><a href="L%C3%B6slichkeit" title="Löslichkeit">Löslichkeit</a>
</td>
<td>
<ul><li>sehr leicht löslich in Wasser (706 g·l<sup>−1</sup> bei 20&nbsp;°C)<sup id="cite_ref-William_M._Haynes_2-0" class="reference"><a href="#cite_note-William_M._Haynes-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li>
<li>nahezu unlöslich in einer 4:1 (v/v) Mischung aus 47%iger HBr und <a href="Methanol" title="Methanol">Methanol</a><sup id="cite_ref-Kirby_1-4" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li></ul>
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<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Gefahren- und Sicherheitshinweise
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<td colspan="2" style="padding-top:7px; text-align:center;"><span typeof="mw:File"></span><br><span style="line-height:1.1em;"><b><a href="Radioaktiv" class="mw-redirect" title="Radioaktiv">Radioaktiv</a></b></span>
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<td colspan="2">
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<tbody><tr>
<td colspan="2" style="text-align:center"><b><a href="Global_harmonisiertes_System_zur_Einstufung_und_Kennzeichnung_von_Chemikalien" title="Global harmonisiertes System zur Einstufung und Kennzeichnung von Chemikalien">GHS-Gefahrstoffkennzeichnung</a></b><br><i>keine Einstufung verfügbar</i><sup id="cite_ref-NV_3-0" class="reference"><a href="#cite_note-NV-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</td></tr></tbody></table>
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<tr>
<td colspan="2" style="background:#FFDEAD; color:#202122; font-size:80%; text-align:center; line-height:150%; padding:.25em;">Wenn nicht anders vermerkt, gelten die angegebenen Daten bei <a href="Standardbedingungen" title="Standardbedingungen">Standardbedingungen</a> (0 °C, 1000&nbsp;hPa).
</td></tr></tbody></table><p><span class="editoronly" style="display:none;"></span>
</p><p><b>Radiumbromid</b> ist ein weißer Feststoff, der im Dunkeln von <a href="Lumineszenz" title="Lumineszenz">selber leuchtet</a>. Im Laufe der Zeit färbt sich Radiumbromid durch <a href="Radiolyse" title="Radiolyse">Radiolyse</a> gelblich.<sup id="cite_ref-Kirby_1-5" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Gewinnung_und_Darstellung">Gewinnung und Darstellung</h2></div>
<p>Wasserfreies Radiumbromid wird hergestellt, indem man das Chlorid bei Rotglut mehrere Stunden mit gasförmigem <a href="Bromwasserstoff" title="Bromwasserstoff">Bromwasserstoff</a> umsetzt.<sup id="cite_ref-Kirby_1-6" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Das Dihydrat RaBr<sub>2</sub>·2 H<sub>2</sub>O des Radiumbromids wird durch Auflösen von Radiumcarbonat in <a href="Bromwasserstoffs%C3%A4ure" title="Bromwasserstoffsäure">Bromwasserstoffsäure</a> und anschließender Kristallisation erhalten.<sup id="cite_ref-Gmelin_4-0" class="reference"><a href="#cite_note-Gmelin-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {RaCO_{3}+2\ HBr+H_{2}O\longrightarrow RaBr_{2}\cdot \ 2\ H_{2}O+CO_{2}\uparrow } }">
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {RaCO_{3}+2\ HBr+H_{2}O\longrightarrow RaBr_{2}\cdot \ 2\ H_{2}O+CO_{2}\uparrow } }</annotation>
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<div class="mw-heading mw-heading2"><h2 id="Eigenschaften">Eigenschaften</h2></div>
<p>Aus wässriger Lösung kristallisiert Radiumbromid als Dihydrat aus, das isomorph mit <a href="Bariumbromid" title="Bariumbromid">Bariumbromid</a> BaBr<sub>2</sub>·2H<sub>2</sub>O ist. Das Dihydrat kann entwässert werden, indem man 200&nbsp;°C heiße, trockene Luft darüberleitet.<sup id="cite_ref-Kirby_1-7" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Das frisch kristallisierte Salz ist farblos, färbt sich aber durch Radiolyse durch <a href="Alphastrahlung" title="Alphastrahlung">Alphastrahlung</a> mit der Zeit gelb. Durch das in den Kristallen entstandene <a href="Helium" title="Helium">Helium</a> kann es passieren, dass die Kristalle zerplatzen.<sup id="cite_ref-Kirby_1-8" class="reference"><a href="#cite_note-Kirby-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-Kirby-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Kirby_1-0">a</a></sup> <sup><a href="#cite_ref-Kirby_1-1">b</a></sup> <sup><a href="#cite_ref-Kirby_1-2">c</a></sup> <sup><a href="#cite_ref-Kirby_1-3">d</a></sup> <sup><a href="#cite_ref-Kirby_1-4">e</a></sup> <sup><a href="#cite_ref-Kirby_1-5">f</a></sup> <sup><a href="#cite_ref-Kirby_1-6">g</a></sup> <sup><a href="#cite_ref-Kirby_1-7">h</a></sup> <sup><a href="#cite_ref-Kirby_1-8">i</a></sup></span> <span class="reference-text">Kirby, H. W. and Salutsky, Murrell L. (1964) <a rel="nofollow" class="external text" href="https://sgp.fas.org/othergov/doe/lanl/lib-www/books/rc000041.pdf">The Radiochemistry of Radium</a>, Subcommittee on Radiochemistry, National Academy of Sciences, abgerufen am 28. Februar 2017.</span>
</li>
<li id="cite_note-William_M._Haynes-2"><span class="mw-cite-backlink"><a href="#cite_ref-William_M._Haynes_2-0">↑</a></span> <span class="reference-text">William M. Haynes: <cite style="font-style:italic">CRC Handbook of Chemistry and Physics, 97th Edition</cite>. CRC Press, 2016, ISBN 978-1-4987-5429-3, <span style="white-space:nowrap">S.<span style="display:inline-block;width:.2em">&nbsp;</span>100</span> (<a rel="nofollow" class="external text" href="https://books.google.de/books?id=VVezDAAAQBAJ&amp;pg=RA4-PA100#v=onepage">eingeschränkte Vorschau</a> in der Google-Buchsuche).<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rfr_id=info:sid/de.wikipedia.org:Radiumbromid&amp;rft.au=William+M.+Haynes&amp;rft.btitle=CRC+Handbook+of+Chemistry+and+Physics%2C+97th+Edition&amp;rft.date=2016&amp;rft.genre=book&amp;rft.isbn=9781498754293&amp;rft.pages=100&amp;rft.pub=CRC+Press" style="display:none">&nbsp;</span></span>
</li>
<li id="cite_note-NV-3"><span class="mw-cite-backlink"><a href="#cite_ref-NV_3-0">↑</a></span> <span class="reference-text">Die von der Radioaktivität ausgehenden Gefahren gehören nicht zu den einzustufenden Eigenschaften nach der GHS-Kennzeichnung. In Bezug auf weitere Gefahren wurde dieser Stoff entweder noch nicht eingestuft oder eine verlässliche und zitierfähige Quelle hierzu wurde noch nicht gefunden. </span>
</li>
<li id="cite_note-Gmelin-4"><span class="mw-cite-backlink"><a href="#cite_ref-Gmelin_4-0">↑</a></span> <span class="reference-text"><a href="Gmelins_Handbuch_der_Anorganischen_Chemie" class="mw-redirect" title="Gmelins Handbuch der Anorganischen Chemie">Gmelins Handbuch der Anorganischen Chemie</a>: Radium, System Nummer 31, Achte Auflage, Verlag Chemie GmbH, Berlin 1927, Seite 61–62.</span>
</li>
</ol>
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<div class="klappleiste-kopf">Erdalkalimetallbromide</div>
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<p><a href="Berylliumbromid" title="Berylliumbromid">Berylliumbromid</a>&nbsp;|
<a href="Magnesiumbromid" title="Magnesiumbromid">Magnesiumbromid</a>&nbsp;|
<a href="Calciumbromid" title="Calciumbromid">Calciumbromid</a>&nbsp;|
<a href="Strontiumbromid" title="Strontiumbromid">Strontiumbromid</a>&nbsp;|
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