Thermal properties of aluminum oxide from 0 to 1200 K

Furukawa, George T.; Douglas, Thomas B.; McCoskey, Robert E.; Ginnings, D.C.

doi:10.6028/jres.057.008

Cited by 238 publications

(84 citation statements)

References 14 publications

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“…The furna ce, ice calorimeter and th ermome try of this investi gation are very similar to those use d previously in this laboratory for enthalpy meas urem e nts on th e Calorimetry Conference Sample [2]. Howe ver.…”

Section: _1 Calorimeter Propermentioning

confidence: 53%

“…Details desc ribing the preparaLlOn and analysis of th e Calorimetry Confere nce O'-AI~O:1 have already bee n given [2]. Th e ne w O'-AI~O:1 sample (SRM 720) was produce d by th e Linde Air Products Company, as was the Calorimetry Conference Sample.…”

Section: Samplesmentioning

confidence: 99%

“…It was felt that its ready a vailability in hi ghl y pure form as synthetic sa pphire, togethe r with its c he mi cal and mechanical stability, would mak e it s uitable for use from th e cryogenic temperature range to near its melting point (2327 K ± 6 K [1]1). Th e National Bureau of S tandard s ("NBS"), as part of its overall res pon sib ility for th e mainte nan ce of stand ard s in seve ral areas of sc ie nce and indu stry , s ub se qu e ntly und e rtoo k th e meas ureme nt of th e heat ca pac ity a nd e nthalpy of a special sampl e of pure a-A I:!O:l fro m app rox im a tely 0 to 1200 K [2] . Alth oug h the NBS distribut e d for th e Calo rim e try Co nfere nce, spec im e ns from thi s sa mpl e of a-Al:!O:l I Fi~urt.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the relative enthalpy of pure a-Al2O3 (NBS heat capacity and enthalpy Standard Reference Material No. 720) from 273 to 1173 K

Ditmars¹,

Douglas²

1971

J. RES. NATL. BUR. STAN. SECT. A.

Self Cite

126

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Th e re lat ive e nth a lp y of NBS S ta nd ard Re fe re nce Matcr ia l No. 720 (99.98 perce nt pure. s in glec rys ta l a· AI, O". a ca lorim e tri c hea t-ca pac it y s tandard ) was meas ured ovpr th e range 273 to [173 K by th e drop me thod us ing a hi ghl y prec ise Bun se n ice ca lo rim e te r. Entha lpy d a ta ove r th e s ame te mp e ratun: int e rv a l we re o bt a in ed a lso o n th e Ca lorim etry Co nfe r'e nce Sa mpl e of thi s s ubs ta nce. T hese res ult s a re be lieve d to be more acc ura te th a n s imi lar NBS res u lts o n th e la tt e r sa mpl e pub lis hed in ] 956. a nd s how no s ig n ifi ca nt di sco ntinuit y with th e NBS data on th e sa me s ubs ta nce tha t cove red th e ra nges 13 to 380 K and ] · 173 to 2257 K. Th e ave rage deviation from th e mean for a ll e nt ha lpy meas ure me nt s o n th e S RM 720 s amp le was 0.0 17 pe rce nt , and the s mooth e nth a lpy valu es rl c rive d from th e data were es tim a te d to be acc ura te to 0.1 pe rce nt. Th e preca uti o ns obse rved in o rd e r to minimi ze meas urin g e rrors a re d esc ribed in detail. Th e dat a are co mp a red with many se ts o f th e mos t re li ab le pub lis he d data ava il ab le and new reco mm e nd ed va lues for the th er mody na mi c fun c ti o ns of a·A I, O" a re prese ntt'd for th e int e rv a l 0 to 1200 K. Key wo rd s: Alumina; a luminium ox ide; co r u ndum : drop ca lo rim e tr y: c nth a lp y; hea t ca pac it y s ta nd ard; s pe c ifi c hea t : s ta nd a rd re feren ce ma teria l; sy nt he ti c s apph ire; th ermodyna mi c function s.

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Section: _1 Calorimeter Propermentioning

confidence: 53%

Section: Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of the relative enthalpy of pure a-Al2O3 (NBS heat capacity and enthalpy Standard Reference Material No. 720) from 273 to 1173 K

Ditmars¹,

Douglas²

1971

J. RES. NATL. BUR. STAN. SECT. A.

Self Cite

126

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“…Heat capacity of the sample is obtained after subtracting the copper-cell contribution (see Brunet et al 2004 for the heat capacity of the empty cell). The accuracy of C p measurement is estimated to ±0.8 J mol -1 K -1 based on measurements on a reference compound (a-Al 2 O 3 , Furukawa et al 1956). This accuracy can be converted into an entropy uncertainty (r) of around 1.5% (Brunet et al 2004).…”

Section: Calorimetric Methodsmentioning

confidence: 99%

Thermochemistry of monazite-(La) and dissakisite-(La): implications for monazite and allanite stability in metapelites

Janots

Brunet

Goffé

et al. 2007

Contrib Mineral Petrol

137

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Thermochemical properties have been either measured or estimated for synthetic monazite, LaPO 4 , and dissakisite, CaLaMgAl 2 (SiO 4 ) 3 OH, the Mg-equivalent of allanite. A dissakisite formation enthalpy of -6,976.5 ± 10.0 kJ mol -1 was derived from high-temperature drop-solution measurements in lead borate at 975 K. A third-law entropy value of 104.9 ± 1.6 J mol -1 K -1 was retrieved from low-temperature heat capacity (C p ) measured on synthetic LaPO 4 with an adiabatic calorimeter in the 30-300 K range. The C p values of lanthanum phases were measured in the 143-723 K range by differential scanning calorimetry. In this study, La(OH) 3 appeared as suitable for drop solution in lead borate and represents an attractive alternative to La 2 O 3 . Pseudo-sections were calculated with the THERIAK-DOMINO software using the thermochemical data retrieved here for a simplified metapelitic composition (La = P REE + Y) and considering monazite and Fe-free epidotes along the dissakisite-clinozoïsite join, as the only REE-bearing minerals. Calculation shows a stability window for dissakisite-clinozoïsite epidotes (T between 250 and 550°C and P between 1 and 16 kbar), included in a wide monazite field. The P-T extension of this stability window depends on the bulk-rock Ca-content. Assuming that synthetic LaPO 4 and dissakisite-(La) are good analogues of natural monazite and allanite, these results are consistent with the REE-mineralogy sequence observed in metapelites, where (1) monazite is found to be stable below 250°C, (2) around 250-450°C, depending on the pressure, allanite forms at the expense of monazite and (3) towards amphibolite conditions, monazite reappears at the expense of allanite.

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“…It was essential to modify the Gordon Taylor equation to fit the highest values of the CB/PPy. The parameter k GT in Gordon Taylor equation could be replaced by the polynomial fit equation which describes the dependence of T g on the mass fraction of the component as following: Alternatively, the heat flow rate into the sample is obtained from the following relation [13]: …”

Section: Xrd Measurementmentioning

confidence: 99%

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

Ahmed

El-Bary

2018

Arab Journal of Nuclear Sciences and Applications

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Thermal properties of aluminum oxide from 0 to 1200 K

Cited by 238 publications

References 14 publications

Measurement of the relative enthalpy of pure a-Al2O3 (NBS heat capacity and enthalpy Standard Reference Material No. 720) from 273 to 1173 K

Measurement of the relative enthalpy of pure a-Al2O3 (NBS heat capacity and enthalpy Standard Reference Material No. 720) from 273 to 1173 K

Thermochemistry of monazite-(La) and dissakisite-(La): implications for monazite and allanite stability in metapelites

Structural and Thermal Analysis of Carbon Nano-Particles/Polypyrrole/Poly (Ethylene – Co – Vinyl Acetate) Composites

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