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An explicit and novel structure,lattice dynamics,and photoemission of La-doped nanocrystalline SrZrO_(3) perovskite

Rare Metals 2021年第1期40卷 105-112页

作者： kamilia sedeek Nahed Makram Hanan Hantour Taghreed Zaghloul Amer Shimaa Ali Said Nano-Materials Laboratory Physics DepartmentFaculty of ScienceAl-Azhar UniversityNasr CityCairo 11751Egypt Physics Department Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11751Egypt

As no complete and comprehensive studies have been previously reported for La-doped nanocrystalline SrZrO_(3)(SZO),we researched herein a detailed investigation for pure and La-doped samples.A modified solid-state reaction process,including successive cycles of milling and sintering at high temperature,was followed to produce SZO and Sr_(0.9)La_(0.1)ZrO_(3)(SLZO)powdered *** analysis of X-ray diffractometer data predicts that the two samples exhibit orthorhombic structure with an increase in crystallite size by~25%for doped sample.A great reduction in Raman modes intensity(~60%)and an annihilation of several vibration modes were detected using Raman *** degree of ordering on the B-site was recorded to be higher in La-doped *** to ultraviolet-visible(UV-Vis)absorption,a decrease in the optical gap width(E_(g))from 4.40 eV to 4.21 eV was achieved by La incorporation due to the presence of additional defect states such as oxygen and Sr vacancies at the band *** process of electron-hole recombination was studied using photoluminescence(PL)*** of PL spectra yielded four emission bands:one green band,one blue band,and two violet *** intense violet emission atλ=393 nm approximately five times greater than that detected for pure SZO is realized as La^(3+)substitutes for Sr^(2+).Such property nominates SLZO for technological applications requiring highly intense violet emission,e.g.,light-emitting diodes.

关键词： Orthorhombic perovskite structure Lattice dynamics Diffused reflectance Photoluminescence Highly intense violet emission

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Cavernous hemangioma of the cervix and pregnancy: a case report

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Open Journal of Obstetrics and Gynecology 2011年第4期1卷 221-225页

作者： Samar Elkhateb Mostafa Azzouzi Idrissi kamilia Laabadi Leila Chbani Hikmat Chaara AbdIlah Melhouf 不详

Purpose: Cavernous haemangiomas of the uterine cervix are very rare and usually harmless. It is a benign tumor that may cause gynecological obstetrical complications. Although it is a benign condition but it can have serious consequences for the mother as well as for the baby. The treatment is often surgical and diagnosis is histological. Methods and Result: we reported a case of cavernous haemangioma of the cervix in a 25-year old multiparous patient, referred to our Centre in the 33 - 34 gestational weeks for premature labor with membranes rupture. A 3 cm × 6 cm soft regular purplish red mass is found in the uterine cervix. Tocolosys, prophylactic antibiotic therapy and corticotherapy for fetus pulmonary maturation were then decided after elimination of chorioamniotite signs. Caesarean has been made during labor, a week later, for tumor previa. The tumor excision has been made through the vagina after fetus extraction. The histological examination confirmed diagnosis of the cavernous haemangioma. Discussion: Further to this observation, the clinical, histological and therapeutic characteristics of the cavernous haemangioma unusual presentation were drawn up and literature enriched since this pathology is rare. Most previous reports in the literature consist of singlecase histories, and the experience of individual institutions is limited. The patients dramatically present dilemmas in the disease management. This can result in uncontrolled bleeding especially during operative delivery and may require hysterectomy. To avoid unexpected bleeding from haemangioma, patients should be repeatedly examined for haemangioma of the birth canal, and special care should be taken in choosing the delivery mode.

关键词： Cavernous Haemangioma Uterine Cervix Pregnancy Tocolytic Therapy

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