Vapour pressure and standard enthalpy of sublimation of H3BO3

被引：30

作者：

Pankajavalli, R. ^{[1
]}

Anthonysamy, S. ^{[1
]}

Ananthasivan, K. ^{[1
]}

Vasudeva Rao, P. R. ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Div Fuel Chem, Chem Grp, Kalpakkam 603102, Tamil Nadu, India

来源：

JOURNAL OF NUCLEAR MATERIALS | 2007年 / 362卷 / 01期

关键词：

A0100; T0400;

D O I：

10.1016/j.jnucmat.2006.12.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A horizontal thermal analysis instrument was adapted as a transpiration apparatus for the measurement of vapour pressure of solid boric acid, H3BO3. The experimental parameters necessary for establishing a dynamic isothermal congruent vapourisation equilibrium of H3BO3 were identified. Using these optimized transpiration experiments, the vapour pressures were measured in the temperature range 326-363 K. The temperature dependence of the measured values of vapour pressures could be expressed using the expression, log(p/Pa) 26.83( +/- 0.09) - 9094(+/- 246)/T (K). The standard enthalpy of sublimation, Delta H-sub(0), of H3BO3 was estimated to be 174.1 +/- 4.7 kJ mol(-1) at the mean temperature of the present measurements, viz., 345 K. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：128 / 131

页数：4

共 12 条

[1]

BABU VR, 1996, SEMINAR INHERENT ENG

[2]

BAILLY H, 1997, NUCL FUEL PRESSURIZE

[3]

Chase M. W., 1985, JANAF THERMOCHEMICAL

[4]

Greenwood N N, 1997, CHEM ELEMENTS, P145

[5]

Jolly W.L, 1991, MODERN INORGANIC CHE

[6]

KLEYKAMP H, 2006, COMMUNICATION

[7]

Knacke O., 1991, Thermochemical Properties of Inorganic Substances, V2nd

[8] Vapour pressure and standard enthalpy of sublimation of KRF4 by a TG based transpiration technique [J].

Pankajavalli, R ;

Ananthasivan, K ;

Anthonysamy, S ;

Rao, PRV .

JOURNAL OF NUCLEAR MATERIALS, 2005, 345 (2-3) :96-100

[9] Thermal stability of organo-chromium or chromium organic complexes and vapor pressure measurements on tris(2,4-pentanedionato)chromium(III) and hexacarbonyl chromium(0) by TG-based transpiration method [J].

Pankajavalli, R ;

Mallika, C ;

Sreedharan, OM ;

Raghunathan, VS ;

Premkumar, PA ;

Nagaraja, KS .

CHEMICAL ENGINEERING SCIENCE, 2002, 57 (17) :3603-3610

[10]

PREMKUMAR PA, 2004, THESIS U MADRAS CHEN, pCH5

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