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Thermal and structural analysis of 40La(2)O(3)-10Nb(2)O(5)-(50-x)Al2O3-xBaO glasses
Lu, Ping1,2; Zhang, Yixuan2; Li, Jianqiang3
2019-10-15
Source PublicationJOURNAL OF NON-CRYSTALLINE SOLIDS
ISSN0022-3093
Volume522Pages:8
AbstractAluminate glasses have excellent optical and mechanical properties, in addition to high thermal and chemical stability. However, aluminate glasses require high melting temperatures and exhibit poor glass forming ability, causing difficulties while preparation by the melt-quench method. Therefore, it is necessary to establish novel methods to improve melting conditions and glass forming tendencies for aluminate glasses. 40La(2)O(3)-10Nb(2)O(5)-(50-x)Al2O3-xBaO (x = 0, 2.5, 5, 7.5, 10) glasses were prepared by the aerodynamic levitation method. XRD, DTA, and Raman and NMR spectroscopic techniques were used to investigate the effects of BaO on the structure and thermal properties-including crystallization behavior-of lanthanum aluminate glass. The results show that the addition of BaO increases the glass transition temperature (T-g) and stability Delta T of the baseline glass, as Al-Ba-7.5 (40Al(2)O(3)-10Nb(2)O(5)-42.5Al(2)O(3)-7.5BaO) glass has the highest AT value (151 degrees C). The 27 Al MAS NMR spectrum of a high BaO-content glass (Al-Ba-10) shows that about 80% of Al-[IV] and 15% of Al-[V] are present in the glass network. Raman scattering spectra indicate that a peak shown around 790 cm(-1) canbe assigned to the internal stretching vibrations of the Al-non-bridging oxygen (NBO) bonds in depolymerized [AlO4/2] tetrahedrons. The crystallization activation energies were calculated to be 1157.1 kJ/mol and 891.7 kJ/mol (Kissinger method) for Al-Ba-x (x = 0, 7.5) glasses, respectively, which progresses as a diffusion-controlled three-dimensional growth process. The nucleation rate of Al-Ba-O decreases continuously, while Al-Ba-7.5 increases.
KeywordLa2O3-Nb2O5-Al2O3 glass Thermal properties Structure Crystallization kinetics
DOI10.1016/j.jnoncrysol.2019.119558
Language英语
WOS KeywordCRYSTALLIZATION KINETICS ; ALUMINOSILICATE GLASSES ; ALUMINATE GLASSES ; OPTICAL-PROPERTIES ; HIGH-TEMPERATURE ; AL COORDINATION ; RAMAN ; ER3+/YB3+ ; NMR ; SILICATE
Funding ProjectNational Key Research and Development Program of China[2016YFC0700905] ; National Natural Science Foundation of China[51674232]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics ; Materials Science, Multidisciplinary
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China
WOS IDWOS:000488998900016
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/31085
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Jianqiang
Affiliation1.Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China
2.Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China
3.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
Recommended Citation
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Lu, Ping,Zhang, Yixuan,Li, Jianqiang. Thermal and structural analysis of 40La(2)O(3)-10Nb(2)O(5)-(50-x)Al2O3-xBaO glasses[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2019,522:8.
APA Lu, Ping,Zhang, Yixuan,&Li, Jianqiang.(2019).Thermal and structural analysis of 40La(2)O(3)-10Nb(2)O(5)-(50-x)Al2O3-xBaO glasses.JOURNAL OF NON-CRYSTALLINE SOLIDS,522,8.
MLA Lu, Ping,et al."Thermal and structural analysis of 40La(2)O(3)-10Nb(2)O(5)-(50-x)Al2O3-xBaO glasses".JOURNAL OF NON-CRYSTALLINE SOLIDS 522(2019):8.
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