Compressibility of mimetite and pyromorphite at high pressure

Compressibility of mimetite and pyromorphite at high pressure
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模拟铁矿和磷氯铅矿在高压下的压缩性

DOI:
10.1080/08957959.2013.765003
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发表时间:
2013-03
影响因子:
2
通讯作者:
Xie Hongsen
Xie Hongsen
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zhou Wenge;Li Baosheng;Chen Zhiqiang;Xie Hongsen

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采用原位角色散X射线衍射和金刚石对顶砧装置,在300 K下,分别在14.1 GPa和14.9 GPa的压力下,对砷铅矿[Pb 5(AsO 4)3Cl]和磷氯铅矿[Pb 5(PO 4)3Cl]进行了高压X射线衍射实验。在实验压力范围内,未观察到硫砷铅矿和磷氯铅矿的相变。用三阶Birch-Murnaghan状态方程(BM-EoS)拟合静水应力条件下的P-V数据,得到:水云母的K 0=46(7)GPa,V0 =680(2)μ 3,K 0′=15(4);磷氯铅矿的K 0=44(5)GPa,V0 =636(1)μ 3,K 0′=15(3)。轴向压缩性也用三阶“线性化”BM-EoS计算。结果表明:硫砷铅矿和磷氯铅矿的K 0a:K 0 c分别为1:1.00和1:1.28,表明硫砷铅矿和磷氯铅矿分别具有弹性各向同性和轻微的各向异性。将钒铅矿[Pb 5(VO 4)3Cl]的状态方程数据与砷铅矿[Pb 5(AsO 4)3Cl]和磷氯铅矿[Pb 5(PO 4)3Cl]的状态方程数据进行比较,发现As 5+和P5+取代V5+对体积模量的影响不明显,但对轴向参数、压缩比和弹性各向异性的影响较大。
High pressure X-ray diffraction experiments on mimetite [Pb5(AsO4)3Cl] and pyromorphite [Pb5(PO4)3Cl] were performed up to 14.1 and 14.9 GPa, respectively, at 300 K, using in situ angle-dispersive X-ray diffraction and a diamond anvil cell. No phase transition of mimetite and pyromorphite was observed within the experimental pressure range. Fitting the P–V data under hydrostatic stress conditions with a third-order Birch–Murnaghan Equations of State (BM-EoS) we obtained: K 0=46(7) GPa, V 0=680(2) Å3, and K 0′=15(4) for mimetite; K 0=44(5) GPa, V 0=636(1) Å3, and K 0′=15(3) for pyromorphite. The axial compressibility was also calculated with a third-order ‘linearized’ BM-EoS. We obtained K 0a :K 0c =1:1.00 for mimetite, and K 0a :K 0c =1:1.28 for pyromorphite, indicating that mimetite and pyromorphite are elastically isotropic and slightly anisotropic, respectively. Comparing the previous equation of state data of vanadinite [Pb5(VO4)3Cl] with the current results of mimetite [Pb5(AsO4)3Cl] and pyromorphite [Pb5(PO4)3Cl], we found that the substitution of V5+ by As5+ and P5+ has an insignificant effect on the bulk modulus, but has a greater effect on the axial parameters, compression ratio, and elastic anisotropy.
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