Thermodynamic data of belite polymorphs

Thermodynamic data of belite polymorphs
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贝利特多晶型物的热力学数据

DOI:
10.1016/j.cemconres.2021.106621
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发表时间:
2022
影响因子:
11.4
通讯作者:
H.-M. Ludwig
H.-M. Ludwig
中科院分区:
工程技术1区
文献类型:
--
作者:
K.-D. Grevel;F. Bellmann;J. Majzlan;E. Dachs;A. Benisek;H.-M. Ludwig

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波特兰水泥熟料的一个主要成分是Ca 2SiO 4(C2 S,贝利特).用高温氧化物熔体量热法研究了β-C2 S(钾长石)、γ-C2 S(钙橄榄石)和xC 2S三种多晶型的合成样品在700° C下的形成过程。对天然硅灰石(CaSiO 3)样品进行了测量以作比较。用PPMS弛豫量热法测定了C2 S相的低温热容。获得了β-和γ-C2 S的补充DSC数据,以验证它们到400° C的热容演变。β-C2 S和γ-C2 S的推荐值为:Δ f H 0 298 γ− C 2 S=− 2316.0±4.5 kJ mol− 1,S 0 298 γ− C 2 S= 119.7±0.9 J mol− 1 K− 1,C P(γ-C 2 S)=(249.098− 1949.5 T-0.5-1.60822 <$10 6 T− 2+ 2.77532 <$10 8 T− 3)J K− 1 mol− 1,[T]= K,Δ f H 0 298 β− C 2 S=− 2307.6±4.5 kJ mol− 1,S 0 298 β− C2 S= 122.2±0.9 J mol− 1 K− 1,C P(β-C2 S)=(259.721− 2466.09 T-0.5+ 2.62687 <$10 6 T− 2-4.77891 <$10 8 T− 3)JK − 1 mol− 1,[T]= K.
One major component of Portland cement clinker is Ca 2 SiO 4 (C 2 S, belite). Synthetic samples of three polymorphs, β-C 2 S (larnite), γ-C 2 S (calcio olivine), and xC 2 S were investigated by high-temperature oxide melt solution calorimetry at 700° C to obtain their enthalpies of formation. A natural sample of wollastonite (CaSiO 3) was measured for comparison. Low-temperature heat capacity data of the C 2 S phases were recorded by relaxation calorimetry using a PPMS. Supplementary DSC data of β-and γ-C 2 S were obtained to verify their heat capacity evolution to 400° C. The recommended values for β-C 2 S and γ-C 2 S are: Δ f H 0 298 γ− C 2 S=− 2316.0±4.5 kJ mol− 1, S 0 298 γ− C 2 S= 119.7±0.9 J mol− 1 K− 1, C P (γ-C 2 S)=(249.098− 1949.5 T–0.5–1.60822∙ 10 6 T− 2+ 2.77532∙ 10 8 T− 3) J K− 1 mol− 1,[T]= K, Δ f H 0 298 β− C 2 S=− 2307.6±4.5 kJ mol− 1, S 0 298 β− C 2 S= 122.2±0.9 J mol− 1 K− 1, and C P (β-C 2 S)=(259.721− 2466.09 T–0.5+ 2.62687∙ 10 6 T− 2–4.77891∙ 10 8 T− 3) J K− 1 mol− 1,[T]= K.
DOI: 10.1016/j.cryogenics.2011.04.011
发表时间: 2011-08
期刊: Cryogenics
影响因子: 2.1
作者:
Dachs E;Benisek A
通讯作者: Benisek A
DOI: --
发表时间: 1957
期刊:
影响因子: --
作者:
E. G. King
通讯作者: E. G. King
DOI: --
发表时间: 1934
期刊:
影响因子: --
作者:
O. Johannson;T. Thorvaldson
通讯作者: T. Thorvaldson
DOI: --
发表时间: 1951
期刊:
影响因子: --
作者:
E. G. King
通讯作者: E. G. King
DOI: --
发表时间: 1994
期刊:
影响因子: --
作者:
F. Ayed;F. Sorrentino;R. Castanet
通讯作者: R. Castanet