Chemical short-range order and lattice deformations in MgyTi1-yHx thin films probed by hydrogenography

被引：33

作者：

Gremaud, R. ^{[1
]}

Baldi, A. ^{[1
]}

Gonzalez-Silveira, M. ^{[1
]}

Dam, B. ^{[1
]}

Griessen, R. ^{[1
]}

机构：

[1] Vrije Univ Amsterdam, Fac Sci, Dept Phys & Astron Condensed Matter Phys, NL-1081 HV Amsterdam, Netherlands

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.77.144204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A multisite lattice gas approach is used to model pressure-optical-transmission isotherms (PTIs) recorded by hydrogenography on Mg(y)Ti(1-y)H(x) sputtered thin films. The model reproduces the measured PTIs well and allows us to determine the chemical short-range order parameter s. The s values are in good agreement with those determined from extended x-ray absorption fine structure measurements. Additionally, the PTI multisite modeling yields a parameter L that accounts for the local lattice deformations with respect to the average Mg(y)Ti(1-y) lattice given by Vegard's law. It is thus possible to extract two essential characteristics of a metastable alloy from hydrogenographic data.

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