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![[Figure 2]](ks5415fig2mag.jpg)
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Figure 2
XRD patterns of the Hemenway cristobalite standard (left) and ash sample MRA5/6/99 (right) at four distinct temperatures: (a) room temperature as α-cristobalite; (b) prior to the α–β transition following thermal expansion (Δdα); (c) midway through the transition; and (d) following the transition to β-cristobalite. Patterns were collected for intervals of 1 min per given temperature and are displayed between 21.0 and 22.5° 2θ to enlarge the primary (101)α and (111)β peak region. |
![[Figure 2]](ks5415fig2.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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