<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>F. E. Senftle</dc:contributor>
  <dc:contributor>G. Donnay</dc:contributor>
  <dc:creator>A. N. Thorpe</dc:creator>
  <dc:date>1969</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Ardennite, a rare silicate mineral, contains about 19 wt.% manganese. Some of the manganese atoms are in positions which are close enough to allow negative exchange and hence a reduction of the total magnetic susceptibility. It is shown that the susceptibility can be accounted for approximately by the treatment of Earnshaw and Lewis (1958) for&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-1-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;S =&lt;/mtext&gt;&lt;mtext&gt;5&lt;/mtext&gt;&lt;mtext&gt;2&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;S =52&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;and a Hamiltonian&amp;nbsp;&lt;/span&gt;&lt;i&gt;H&lt;/i&gt;&lt;span&gt;&amp;nbsp;= −2&lt;/span&gt;&lt;i&gt;g&lt;/i&gt;&lt;span&gt;μ&lt;/span&gt;&lt;i&gt;H&lt;/i&gt;&lt;sub&gt;&lt;i&gt;b&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;−2&lt;/span&gt;&lt;i&gt;JS&lt;/i&gt;&lt;sub&gt;1&lt;/sub&gt;&lt;span&gt;·&lt;/span&gt;&lt;i&gt;S&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0022-3697(69)90149-8</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Magnetic susceptibility and exchange coupling in the mineral ardennite</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>