OPTICAL AND OTHER PHYSICAL PROPERTIES OF Al (PO3)3 - CONTAINING FLUOROPHOSPHATE GLASSES
In: Le Journal de Physique Colloques, Jg. 43 (1982-12-01), S. C9- (307S.)
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Zugriff:
In this paper, the optical and some other physical properties of fluorophosphate glasses in binary systems containing A1(P03)3 and the influence of various fluorides on the properties of glass with low A1(P03)3 content have been studied. The positions of low A1(P0,), content glasses in n.~v diagram have been plotted and the partial properties of fluorides in glass have been calculated. Fluorophosphate glass is a glass with special optical properties such as high Abbe value, transmittance in near UV and IR regions and low nonlinear refractive index (np), it is now under development. Comparing the properties of various glassy metaphosphate, it shows that A1(P0.,), possesses a higher refractive index, a greater Abbe valueJ as well as better physical and chemical properties. Therefore A1(P0,)3 has been introduced into many fluorophosphate glasses. The authors have already studied the formation and structure of Al(POo), containing fluorophosphate glasr2l ses , and in the present work, the optical and some other physical properties of those glasses are investigated with the emphasis placed on the low A1(P0,)3 content glasses. The following glass systems were selected for the investigation 1) (100-X),A1(P03)3.X RFp ( R = Li, Na, Ba, Sr, Al ). 2) (10 A1(P03)3.20 A1F3.5Q SrF2.20 LiF) + 5 RFp ( R = Li, Na, K, Be, Mg, Ca, Sr, Ba, Zn, Cd, Pb, Al, Gd ). 3) (5 A1(P03)3.28 A1F3.30 SrF2-27 CaFg.lO LiF) + 3 RFp { R = Li, Na, K, Mg, Ca, Sr, Ba, Zn, Al, Ga ). Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1982958 C9-316 JOURNAL DE PHYSIQUE Aluminium metaphosphate and f l u o r i d e s were used as s t a r t i n g mater ia ls . Glasses w i t h h igh A1(P03)3 content were melted i n s in te red alumina c ruc ib les , and others i n p la t inum c ruc ib les . D i f f e r e n t m e l t i n g condi t ions were selected according t o d i f f e r e n t glass systems. The r e f r a c t i v e ind ices (nd, nF, nC, n ) , the thermal expansion c o e f f i c i e n t s a, 9 the moduli of e l a s t i c i t y E, and the dens i t i es of the glasses were determined, the molecular volumes o f glasses, the average atomic volumes o f f l u o r i n e and oxygen V OF' and t h e p a r t i a1 r e f r a c t i v e ind ices and Abbe values o f var ious f l u o r i d e s i n glasses were ca lcu lated. 1) I n t h e previous workLz1, on the bas is of experimental r e s u l t s o f glass formation, d e v i t r i f i c a t i o n and s t r u c t u r e study, we pointed ou t t h a t the network o f the glasses w i t h 1 ow A1 (P03)3 content i s g r e a t l y destroyed. Therefore the proper ty v a r i a t i o n of these glasses should be s i m i l a r t o t h a t of the oxide glasses i n t h e destroyed region. I n general, the r e f r a c t i v e index and d ispers ion increase w i t h increasing i o n i c rad ius r, wh i le a and E vary w i t h the e l e c t r o s t a t i c fo rce z/a2 between cat i o n s and f l u o r i n e ions ( Fig.1 and 2 ) . F i g . 1 nd vs r ( A ) i n the Fig.2 a30-Tg vs z/aL i n t h e system w i t h 10 mol% A1 (P03)3 system w i t h 10 mol% A1 (P03)3 2) I n the reg ion w i t h low A1(P03)3 content, some f l u o r i d e s such as L iF, MgF2 and AlF3 could reconnect the d is rup ted glass network[21. This i s a lso re f lec ted i n the v a r i a t i o n o f the phys ica l p roper t ies o f glass. I n A1(P03)3 RFn systems, those con ta in ing L i F o r AlF3 possess smal ler VOF (Fig.3), and w i t h the increase i n the RFn content, the increase i n VOF i s r e l a t i v e l y slow. The LiF, MgFz, A1F3con ta in ing glasses a l l have h igher E and lower VOF (Fig.4,5), i t can be considered as the increase i n compactness o f glass s t ruc tu re . 3) I n the glasses w i t h very low A1(P03)3 content, besides the p a t i c u l a r r o l e o f A1 (PO*) rMol% Fig .3 Dependence o f VOF on t h e A1(P03)3 con ten t i n A1(P03)3 RFn systems 10
Titel: |
OPTICAL AND OTHER PHYSICAL PROPERTIES OF Al (PO3)3 - CONTAINING FLUOROPHOSPHATE GLASSES
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Autor/in / Beteiligte Person: | Fuxi, G. ; Yasi, J. ; Fusong, J. |
Link: | |
Zeitschrift: | Le Journal de Physique Colloques, Jg. 43 (1982-12-01), S. C9- (307S.) |
Veröffentlichung: | EDP Sciences, 1982 |
Medientyp: | unknown |
ISSN: | 0449-1947 (print) |
DOI: | 10.1051/jphyscol:1982958 |
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