Thermal decomposition of agardites (REE) : relationship between dehydroxylation temperature and electronegativity

Ray L. Frost; Kristy L. Erickson; Matt L. Weier; Adam R. McKinnon; Peter A. Williams; Peter Leverett

Thermal decomposition of agardites (REE) : relationship between dehydroxylation temperature and electronegativity

Ray L. Frost, Kristy L. Erickson, Matt L. Weier, Adam R. McKinnon, Peter A. Williams, Peter Leverett

Research output: Contribution to journal › Article

17 Citations (Scopus)

Abstract

The thermal decomposition of a suite of synthetic agardites of formula ACuÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ (AsOÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡(OH)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â·3HÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡O where A is given by a rare earth element has been studied using thermogravimetric analysis techniques. Dehydration of the agardites occurs at low temperatures and over an extended temperature range from ambient to around 60ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ mol of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. The mass loss during dehydroxylation shows the number of moles of hydroxyl units is six. There is a linear relationship between the first dehydroxylation temperature and the electronegativity of the agardites (REE).

Original language	English
Number of pages	4
Journal	Thermochimica Acta
Publication status	Published - 2005

Keywords

Agardite
Electronegativity
Mass spectrometry
Thermal analysis

Cite this

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title = "Thermal decomposition of agardites (REE) : relationship between dehydroxylation temperature and electronegativity",

abstract = "The thermal decomposition of a suite of synthetic agardites of formula ACu{\~A}ƒ{\^A}¢{\~A}¢{\^a}‚¬{\AA}¡{\~A}¢{\^a}‚¬ (AsO{\~A}ƒ{\^A}¢{\~A}¢{\^a}‚¬{\AA}¡{\~A}¢{\^a}‚¬{\AA}¾){\~A}ƒ{\^A}¢{\~A}¢{\^a}‚¬{\AA}¡{\~A}¢{\^a}‚¬{\AA}¡(OH){\~A}ƒ{\^A}¢{\~A}¢{\^a}‚¬{\AA}¡{\~A}¢{\^a}‚¬ {\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚{\^A}·3H{\~A}ƒ{\^A}¢{\~A}¢{\^a}‚¬{\AA}¡{\~A}¢{\^a}‚¬{\AA}¡O where A is given by a rare earth element has been studied using thermogravimetric analysis techniques. Dehydration of the agardites occurs at low temperatures and over an extended temperature range from ambient to around 60{\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚ {\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚{\^A}°C. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3{\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚ mol of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456{\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚ {\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚{\^A}°C. The mass loss during dehydroxylation shows the number of moles of hydroxyl units is six. There is a linear relationship between the first dehydroxylation temperature and the electronegativity of the agardites (REE).",

keywords = "Agardite, Electronegativity, Mass spectrometry, Thermal analysis",

author = "Frost, {Ray L.} and Erickson, {Kristy L.} and Weier, {Matt L.} and McKinnon, {Adam R.} and Williams, {Peter A.} and Peter Leverett",

year = "2005",

language = "English",

journal = "Thermochimica Acta",

issn = "0040-6031",

publisher = "Elsevier",

}

TY - JOUR

T1 - Thermal decomposition of agardites (REE) : relationship between dehydroxylation temperature and electronegativity

AU - Frost, Ray L.

AU - Erickson, Kristy L.

AU - Weier, Matt L.

AU - McKinnon, Adam R.

AU - Williams, Peter A.

AU - Leverett, Peter

PY - 2005

Y1 - 2005

N2 - The thermal decomposition of a suite of synthetic agardites of formula ACuÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ (AsOÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡(OH)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â·3HÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡O where A is given by a rare earth element has been studied using thermogravimetric analysis techniques. Dehydration of the agardites occurs at low temperatures and over an extended temperature range from ambient to around 60ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ mol of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. The mass loss during dehydroxylation shows the number of moles of hydroxyl units is six. There is a linear relationship between the first dehydroxylation temperature and the electronegativity of the agardites (REE).

AB - The thermal decomposition of a suite of synthetic agardites of formula ACuÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ (AsOÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡(OH)ÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â·3HÃƒÂ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡O where A is given by a rare earth element has been studied using thermogravimetric analysis techniques. Dehydration of the agardites occurs at low temperatures and over an extended temperature range from ambient to around 60ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. This loss of water is attributed to the loss of zeolitic water. The mass loss of water indicates 3ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ mol of zeolitic water in the structure. Dehydroxylation occurs in steps over a wide range of temperatures from 235 to 456ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚ ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â°C. The mass loss during dehydroxylation shows the number of moles of hydroxyl units is six. There is a linear relationship between the first dehydroxylation temperature and the electronegativity of the agardites (REE).

KW - Agardite

KW - Electronegativity

KW - Mass spectrometry

KW - Thermal analysis

UR - http://handle.uws.edu.au:8081/1959.7/10653

M3 - Article

SN - 0040-6031

JO - Thermochimica Acta

JF - Thermochimica Acta

ER -

Thermal decomposition of agardites (REE) : relationship between dehydroxylation temperature and electronegativity

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Keywords

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