東華大學圖書館 |

Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions./
作者:	Yang, Shuhao.
面頁冊數:	1 online resource (250 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-03, Section: B.
Contained By:	Dissertations Abstracts International84-03B.
標題:	Inorganic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29209778click for full text (PQDT)
ISBN:	9798841791744

Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions.
Yang, Shuhao.

Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions. - 1 online resource (250 pages)

Source: Dissertations Abstracts International, Volume: 84-03, Section: B.

Thesis (Ph.D.)--University of California, Davis, 2022.

Includes bibliographical references

Rare earth (RE) materials have widespread applications and constitute an indispensable part of modern lives. Tailored electrical, optical, and magnetic properties can be achieved by various RE elements in isomorphic structures, providing materials with the desired properties for specific applications. However, the processing of RE materials encounters difficulties in separation and recycling of RE elements due to the similar physical and chemical properties. For better utilization of REs, including mining, recovery, and incorporation into devices, it is essential to have comprehensive knowledge about thermodynamic properties of RE compounds. The present work comprises not only new experimental thermodynamic studies on selected RE compounds but also a fundamental understanding of the energetics of RE compounds. By means of high temperature oxide melt solution calorimetry, formation enthalpies of RE oxycompounds (REOOH, REOF, and REOCl) and ternary sodium fluorides (NaREF4) were measured to provide reliable data for energetic assessments of REs in diverse structures. NaF-NdF3 nanocrystals and Ca1-xRExF2+x solid solutions were also investigated to shed light on the energetics of RE fluoride nanocrystals and solid solutions containing defect clusters. Combining other published thermochemical data, lattice energies of numerous RE compounds were evaluated to reveal the correlations between the energetics and structures of RE materials. RE oxycompounds are important components of RE precipitates and play a key role in the leaching of RE elements. By different synthesis methods, high-purity single-phase REOOH, REOF, and REOCl with various REs were prepared and characterized by powder X-ray diffraction (PXRD). The formation enthalpies from binary components, determined by high temperature oxide melt solution calorimetry, are all negative but become less exothermic from light to heavy RE elements. They confirm the thermodynamic stability of these RE compounds relative to binary oxides and/or halides, The thermal decomposition of REOOH and a structural phase transition in YbOF were studied by differential scanning calorimetry (DSC). Mixed cation (alkali or alkaline earth) RE fluorides have drawn extensive research interest due to their unique luminescent properties and potential applications in phosphors and laser hosts, but limited thermodynamic studies hinder the rational design and synthesis of these materials. The formation enthalpies of NaREF4 follow an opposite trend compared to most ternary RE oxide compounds, becoming increasingly negative for heavier REs. Energetic studies of NaF-NdF3 nanocrystals coupled with chemical analysis and structural characterizations indicate that the α → β phase conversion in aqueous solutions is associated with compositional variations and distinct from the β → α transition driven by temperature for stoichiometric NaNdF4. Formation enthalpies of Ca1-xRExF2+x (RE = La, Pr, and Nd) solid solutions were measured and the relationships between the energetics and structures were discussed. Based on experimental thermodynamic studies, an energetic evaluation of RE crystalline compounds was conducted to identify correlations between structures and thermodynamics. Lattice energies were calculated by Born-Haber cycles, which highly depend on ionic strength and increase in magnitude (becoming more exothermic) from light to heavy RE elements. The slopes of lines relating lattice energies to RE ionic radii are related to RE coordination numbers, contributing to the opposite trends in formation enthalpies for RE oxides and fluorides. A correlation between the magnitude of lattice energies and the structures occurring in RE compounds across the RE series was identified.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798841791744Subjects--Topical Terms:

3173556
Inorganic chemistry.
Subjects--Index Terms:

CalorimetryIndex Terms--Genre/Form:

542853
Electronic books.

Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions.
LDR:05124nmm a2200397K 4500 001 2353731
005 20230313091337.5
006 m o d
007 cr mn ---uuuuu
008 241011s2022 xx obm 000 0 eng d
020 $a 9798841791744
035 $a (MiAaPQ)AAI29209778
035 $a AAI29209778
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Yang, Shuhao. $3 3694062
245 1 0 $a Energetics of Rare Earth Solids Containing Hydroxide and Halide Ions.
264 0 $c 2022
300 $a 1 online resource (250 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 84-03, Section: B.
500 $a Advisor: Navrotsky, Alexandra.
502 $a Thesis (Ph.D.)--University of California, Davis, 2022.
504 $a Includes bibliographical references
520 $a Rare earth (RE) materials have widespread applications and constitute an indispensable part of modern lives. Tailored electrical, optical, and magnetic properties can be achieved by various RE elements in isomorphic structures, providing materials with the desired properties for specific applications. However, the processing of RE materials encounters difficulties in separation and recycling of RE elements due to the similar physical and chemical properties. For better utilization of REs, including mining, recovery, and incorporation into devices, it is essential to have comprehensive knowledge about thermodynamic properties of RE compounds. The present work comprises not only new experimental thermodynamic studies on selected RE compounds but also a fundamental understanding of the energetics of RE compounds. By means of high temperature oxide melt solution calorimetry, formation enthalpies of RE oxycompounds (REOOH, REOF, and REOCl) and ternary sodium fluorides (NaREF4) were measured to provide reliable data for energetic assessments of REs in diverse structures. NaF-NdF3 nanocrystals and Ca1-xRExF2+x solid solutions were also investigated to shed light on the energetics of RE fluoride nanocrystals and solid solutions containing defect clusters. Combining other published thermochemical data, lattice energies of numerous RE compounds were evaluated to reveal the correlations between the energetics and structures of RE materials. RE oxycompounds are important components of RE precipitates and play a key role in the leaching of RE elements. By different synthesis methods, high-purity single-phase REOOH, REOF, and REOCl with various REs were prepared and characterized by powder X-ray diffraction (PXRD). The formation enthalpies from binary components, determined by high temperature oxide melt solution calorimetry, are all negative but become less exothermic from light to heavy RE elements. They confirm the thermodynamic stability of these RE compounds relative to binary oxides and/or halides, The thermal decomposition of REOOH and a structural phase transition in YbOF were studied by differential scanning calorimetry (DSC). Mixed cation (alkali or alkaline earth) RE fluorides have drawn extensive research interest due to their unique luminescent properties and potential applications in phosphors and laser hosts, but limited thermodynamic studies hinder the rational design and synthesis of these materials. The formation enthalpies of NaREF4 follow an opposite trend compared to most ternary RE oxide compounds, becoming increasingly negative for heavier REs. Energetic studies of NaF-NdF3 nanocrystals coupled with chemical analysis and structural characterizations indicate that the α → β phase conversion in aqueous solutions is associated with compositional variations and distinct from the β → α transition driven by temperature for stoichiometric NaNdF4. Formation enthalpies of Ca1-xRExF2+x (RE = La, Pr, and Nd) solid solutions were measured and the relationships between the energetics and structures were discussed. Based on experimental thermodynamic studies, an energetic evaluation of RE crystalline compounds was conducted to identify correlations between structures and thermodynamics. Lattice energies were calculated by Born-Haber cycles, which highly depend on ionic strength and increase in magnitude (becoming more exothermic) from light to heavy RE elements. The slopes of lines relating lattice energies to RE ionic radii are related to RE coordination numbers, contributing to the opposite trends in formation enthalpies for RE oxides and fluorides. A correlation between the magnitude of lattice energies and the structures occurring in RE compounds across the RE series was identified.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Inorganic chemistry. $3 3173556
650 4 $a Materials science. $3 543314
653 $a Calorimetry
653 $a Enthalpy
653 $a Oxyhalide
653 $a Rare earth
653 $a Ternary fluoride
653 $a Thermodynamics
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0488
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of California, Davis. $b Chemistry. $3 1679244
773 0 $t Dissertations Abstracts International $g 84-03B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29209778 $z click for full text (PQDT)