Discontinuous volume change at the orientational-ordering transition in solid C60.

Discontinuous volume change at the orientational-ordering transition in solid C60.
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固体 C60 中定向有序转变时的不连续体积变化。

DOI:
10.1103/physrevb.45.4544
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发表时间:
1992
期刊:
Physical review. B, Condensed matter
影响因子:
--
通讯作者:
Amos B. Smith
Amos B. Smith
中科院分区:
--
文献类型:
--
作者:
P. Heiney;G. Vaughan;J. Fischer;N. Coustel;D. Cox;J. Copley;D. Neumann;W. Kamitakahara;K. Creegan;D. Cox;J. McCauley;Amos B. Smith

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X 射线和中子衍射测量已用于研究固体 C{sub 60} 晶格参数通过取向有序转变的演变。加热时晶格参数跳跃 +0.044{plus minus}0.004 A,表明存在强烈的一阶跃迁。转变上方和下方的平均等压体积热膨胀系数为 6.2{plus minus}0.2{times}10{sup {minus}5} K{sup {minus}1}。我们观察到 5-K 范围内的相位共存,但几乎没有滞后现象。
X-ray and neutron-diffraction measurements have been used to study the evolution of the lattice parameter of solid C{sub 60} through the orientational-ordering transition. The lattice parameter jumps by +0.044{plus minus}0.004 A on heating, indicating a strongly first-order transition. The average isobaric volume thermal-expansion coefficient both above and below the transition is 6.2{plus minus}0.2{times}10{sup {minus}5} K{sup {minus}1}. We observe phase coexistence over a 5-K range, but little if any hysteresis.