Photosensitive studies on V2O5 doped (40-x)Li2O-10Y2O3-50SiO2 glasses

Editorial Board PCSS Journal; П. Нареш; Рао Н. Нарасімха; Чанд Г. Правін; Бабавалі Ск. Факруддін; Е. Рекха

doi:10.15330/pcss.27.2.382-390

Автор(и)

П. Нареш Кафедра фізики, Інженерна школа Велагапуді Рамакрішни Сіддхартхи, Академія Сіддхартхи (університет зі статусом deemed to be university), Віджаявада, Андхра-Прадеш, Індія
Рао Н. Нарасімха Кафедра фізики, Університет Крішни, Коледж післядипломної освіти Dr. MRAR, Нузвід, Андхра-Прадеш, Індія
Чанд Г. Правін Кафедра хімії, Інженерний коледж RVR & JC (автономний), Чоудаварам, Гунтур, Андхра-Прадеш, Індія
Бабавалі Ск. Факруддін Кафедра фізики, Інженерна школа Велагапуді Рамакрішни Сіддхартхи, Академія Сіддхартхи (університет зі статусом deemed to be university), Віджаявада, Андхра-Прадеш, Індія
Е. Рекха Державний коледж, Пакала, округ Чіттур, Андхра-Прадеш, Індія

DOI:

https://doi.org/10.15330/pcss.27.2.382-390

Ключові слова:

оптичне поглинання, FTIR, змішані лужні стекла, силікатні стекла

Анотація

У дослідженні скляні системи хімічного складу (40-x)Li₂O–10Y₂O₃–50SiO₂:xV₂O₅ були отримані методом плавлення з наступним загартуванням. Рентгенодифракційні (XRD) дослідження підтвердили аморфну природу синтезованих зразків. Спектри оптичного поглинання демонструють дві смуги поглинання приблизно при 630 нм та 1030 нм, які ідентифіковано як переходи ²B₂→²B₁ та ²B₂→²E іонів [VO]²⁺ відповідно. Інтенсивність цих смуг зростає та супроводжується незначним червоним зміщенням зі збільшенням вмісту V₂O₅ у скляній матриці. Пряма та непряма оптичні ширини забороненої зони, визначені за теорією Девіса–Мотта, зменшуються зі зростанням концентрації V₂O₅, тоді як енергія Урбаха, розрахована за правилом Урбаха, збільшується. Аналіз ІЧ-спектрів показав наявність у зразках різних структурних одиниць, зокрема асиметричних та симетричних валентних коливань Si–O–Si, зв’язків Si–O–Y, V=O, Si–O–V та Li–O. Встановлено, що інтенсивність асиметричних зв’язків зростає за рахунок симетричних зі збільшенням вмісту V₂O₅. Спектри оптичного поглинання досліджуваних стекол свідчать про співіснування іонних станів V⁴⁺ та V⁵⁺. Спостережувана еволюція характерних смуг поглинання ванадилу зі збільшенням концентрації V₂O₅ вказує на можливе зміщення рівноваги V⁴⁺/V⁵⁺ у скляному середовищі.

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