Low-temperature heat capacity of β-glycine and a phase transition at 252 K

被引：51

作者：

Drebushchak, VA

Boldyreva, EV

Kovalevskaya, YA

Paukov, IE

Drebushchak, TN

机构：

[1] Novosibirsk State Univ, Novosibirsk 630090, Russia

[2] Russian Acad Sci, Siberian Branch, Inst Mineral & Petrog, Novosibirsk 630090, Russia

[3] Russian Acad Sci, Siberian Branch, Inst Inorgan Chem, Novosibirsk 630090, Russia

[4] Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochem, Novosibirsk 630128, Russia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2005年 / 79卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

adiabatic calorimetry; Gibbs free energy; glycine; heat capacity; phase transition; polymorphism;

D O I：

10.1007/s10973-004-0563-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Low-temperature heat capacity of unstable P-glycine was measured in a temperature range 5.5 to 295 K, and thermodynamic functions were calculated. At very low temperatures, heat capacity fits a sum of cubic (Debye) and linear terms: C-p=aT+bT(3). The linear contribution increases with temperature and disappears at the second-order phase transition near 252 K which was observed for the first time.

引用

页码：65 / 70

页数：6

共 6 条

[1]

Boldyreva EV, 2003, J THERM ANAL CALORIM, V73, P419, DOI 10.1023/A:1025457524874

[2] Structural distortion of the α, β, and γ polymorphs of glycine on cooling [J].

Boldyreva, EV ;

Drebushchak, TN ;

Shutova, ES .

ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 2003, 218 (05) :366-376

[3]

Boldyreva EV, 2003, J THERM ANAL CALORIM, V73, P409, DOI 10.1023/A:1025405508035

[4] Low-temperature heat capacity of α and γ polymorphs of glycine [J].

Drebushchak, VA ;

Kovalevskaya, YA ;

Paukov, IE ;

Boldyreva, EV .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2003, 74 (01) :109-120

[5] Synthesis and calorimetric investigation of unstable β-glycine [J].

Drebushchak, VA ;

Boldyreva, EV ;

Drebushchak, TN ;

Shutova, ES .

JOURNAL OF CRYSTAL GROWTH, 2002, 241 (1-2) :266-268

[6] The polymorphism of glycine - Thermochemical and structural aspects [J].

Perlovich, GL ;

Hansen, LK ;

Bauer-Brandl, A .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2001, 66 (03) :699-715

← 1 →