S-stāvokļa retzemju jonu lokālā struktūra fluorīdos un oksifluorīdu stikla keramikās

6533b7cffe1ef96bd1258900

RESEARCH PRODUCT

S-stāvokļa retzemju jonu lokālā struktūra fluorīdos un oksifluorīdu stikla keramikās

subject

Cietvielu fizika Solid State Physics Fizika

description

Darbā veikta S-stāvokļa retzemju jonu (Gd3+ un Eu2+) lokālās struktūras izpēte ar elektronu paramagnētiskās rezonanses (EPR) spektroskopijas metodi ScF3 un BaY2F8 monokristālos, kā arī oksifluorīdu stiklu keramikās ar MeF2 (Me = Ca, Ba, Sr) kristalītiem. Dažādās temperatūrās noteiktie gadolīnija EPR spektru parametri ScF3 – kristālā ar negatīvu termiskās izplešanās koeficientu – liecina par paramagnētiskā centra lokālās struktūras pozitīvu izplešanos ar temperatūru. BaY2F8 kristāla Gd3+ centrs ir aprakstāms ar zemas simetrijas EPR spektru parametru komplektu. S-stāvokļa joniem iebūvējoties oksifluorīdu stiklu keramiku kristāliskajā fāzē, U-veida amorfās fāzes signālu pārklāj intensīva EPR spektru sīkstruktūru ap g = 1,99.

year	journal	country	edition	language
2017-01-01

https://dspace.lu.lv/dspace/handle/7/37284

PEPhysical Sciences and Engineering
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