Energetics of nanoparticle oxides: interplay between surface energy and polymorphism

被引：246

作者：

Navrotsky, A ^{[1
]}

机构：

[1] Univ Calif Davis, Thermochem Facil, Davis, CA 95616 USA

[2] Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA

来源：

GEOCHEMICAL TRANSACTIONS | 2003年 / 4卷 / 1期

关键词：

D O I：

10.1186/1467-4866-4-34

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Many oxides tend to form different structures (polymorphs) for small particles. High temperature oxide melt solution calorimetry has been used to measure the enthalpy as a function of polymorphism and surface area for oxides of Al, Ti, and Zr. The results confirm crossovers in polymorph stability at the nanoscale. The energies of internal and external surfaces of zeolitic silicas with open framework structures are an order of magnitude smaller than those of oxides of normal density.

引用

页码：34 / 37

页数：4

共 19 条

[1]

Banfield J.F., 2001, REV MINERAL GEOCHEM, V44

[2] Energetics of low-temperature polymorphs of manganese dioxide and oxyhydroxide [J].

Fritsch, S ;

Post, JE ;

Navrotsky, A .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, 61 (13) :2613-2616

[3] OCCURRENCE OF METASTABLE TETRAGONAL ZIRCONIA AS A CRYSTALLITE SIZE EFFECT [J].

GARVIE, RC .

JOURNAL OF PHYSICAL CHEMISTRY, 1965, 69 (04) :1238-&

[4] Energetics of stable and metastable low-temperature iron oxides and oxyhydroxides [J].

Laberty, C ;

Navrotsky, A .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1998, 62 (17) :2905-2913

[5] Energetics of a nanophase zeolite independent of particle size [J].

Li, QH ;

Yang, SY ;

Navrotsky, A .

MICROPOROUS AND MESOPOROUS MATERIALS, 2003, 65 (2-3) :137-143

[6] Thermodynamics of Fe oxides:: Part II.: Enthalpies of formation and relative stability of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and maghemite (γ-Fe2O3) [J].

Majzlan, J ;

Grevel, KD ;

Navrotsky, A .

AMERICAN MINERALOGIST, 2003, 88 (5-6) :855-859

[7] Surface enthalpy of boehmite [J].

Majzlan, J ;

Navrotsky, A ;

Casey, WH .

CLAYS AND CLAY MINERALS, 2000, 48 (06) :699-707

[8] Surface energies and thermodynamic phase stability in nanocrystalline aluminas [J].

McHale, JM ;

Auroux, A ;

Perrotta, AJ ;

Navrotsky, A .

SCIENCE, 1997, 277 (5327) :788-791

[9] Effects of increased surface area and chemisorbed H2O on the relative stability of nanocrystalline gamma-Al2O3 and alpha-Al2O3 [J].

McHale, JM ;

Navrotsky, A ;

Perrotta, AJ .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (04) :603-613

[10] High-silica zeolites: a relationship between energetics and internal surface areas [J].

Moloy, EC ;

Davila, LP ;

Shackelford, JF ;

Navrotsky, A .

MICROPOROUS AND MESOPOROUS MATERIALS, 2002, 54 (1-2) :1-13

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