<?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>J.A. Minkin</dc:contributor>
  <dc:contributor>F. E. Senftle</dc:contributor>
  <dc:contributor>Corrine Alexander</dc:contributor>
  <dc:contributor>Charles Briggs</dc:contributor>
  <dc:contributor>H. T. Evans Jr.</dc:contributor>
  <dc:contributor>Gordon L. Nord Jr.</dc:contributor>
  <dc:creator>A. N. Thorpe</dc:creator>
  <dc:date>1977</dc:date>
  <dc:description>&lt;div class="u-margin-s-bottom"&gt;X-Ray diffraction and anisotropic magnetic measurements have been made on single crystals of lunar ilmenite and on terrestrial ilmenite from Bancroft, Ontario, Canada and the Ilmen Mountains, U.S.S.R. The elongated&lt;span&gt;&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;c&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;c&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;-axis of lunar ilmenite, previously reported, is confirmed by new measurements. The shorter&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-2-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;c&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;c&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;-axis found in terrestrial specimens is ascribed to Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;substitution for Ti&lt;sup&gt;4+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the titanium layer. Magnetic measurements on the same specimens show that, in agreement with the Ishikawa-Shirane&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;et al&lt;/i&gt;. model, the initial shortening of the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-3-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;c&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;c&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;-axis by the above substitution of small amounts of Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&amp;lt;8%) causes an increase in Fe&lt;sup&gt;2+&lt;/sup&gt;−Fe&lt;sup&gt;2+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;exchange coupling through Fe&lt;sup&gt;3+&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the titanium layer that lowers the Néel transition temperature. The Weiss temperatures and other magnetic parameters confirm this model proposed by Ishikawa and Shirane&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;et al&lt;/i&gt;.&lt;/div&gt;&lt;div class="u-margin-s-bottom"&gt;Additional transitions found in one of the terrestrial specimens (Bancroft) have been ascribed to a small amount of an exsolved spinel phase, possibly a solid solution phase of magnetite-ülvospinel. The spinel phase is localized in hematite-rich blebs which exsolved from the host ilmenite-rich phase.&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0022-3697(77)90155-X</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Cell dimensions and antiferromagnetism of lunar and terrestrial ilmenite single crystals</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>