Non-destructive structural studies of coins from the Uzundara Fortress using X-ray diffraction and neutron tomography

The copper Heliocles coin and two silver Demetrius coins dated to the II century BC from the archaeological works of the Uzundara fortress of the Greco-Bactrian Kingdom were studied using non-destructive structural diagnostics methods. The phase analysis of the coins was performed using the X-ray diffraction method. Also, the spatial distribution of the internal components of the coins was investigated by neutron imaging methods. It has been established that the dominant phase of the Heliocles coin is copper, however, a small volume of patina was found. It is mainly represented by tenorite CuO phase. The neutron tomography method indicates a deep penetration of tenorite into the thickness of the coin, and its volume fraction can reach 10% of the total volume. Two Demetrius coins consist entirely of silver. The complex profile of coins due to the features of a coinage was reconstructed. The phase composition, the content of the composite phases and three-dimensional models of the studied coins were obtained

Structural Studies of the Qarakhanid Dirham Using X-Ray Diffraction and Neutron Tomography Methods

Abstract: The structure and spatial distribution of corrosion in the volume of the medieval Qarakhanid dirham dated the X–XII century A.D. (Anno Domini) has been investigated using non-destructive structural X-ray diffraction and neutron tomography methods. The phase composition and their spatial distribution inside the coins were obtained. The main phase of the studied dirham is the silver-copper alloy with copper fraction dominance up to 74 wt %. The basic phases of the corrosion fraction are cuprite Cu2O, tenorite CuO and chalcocite Cu2S. The non-uniform distribution of the corrosion penetration in the coin bulk was constructed

Вивчення впорядкованих структур і фазових переходів субкарбіда ванадіюметодом дифракції нейтронів

The results of neutron diffraction study of VC0.47 are presented and discussed. It is established scheme of the phase transitions. A low temperature orthorhombic ordered phase (space group Pbcn) and high temperature hexagonal ordered phase (space group P6322) exists in VC0.47. The kinetic of the transition is described by Kolmogorov – Johnson – Mehl – Avrami law. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/30972Подані та проаналізовані результати дифракції нейтронів на зразках VC0.47. Установлені схеми реалізації фазових переходів. Виявлено існування низькотемпературної ромбічної впорядкованої фази просторової групи Pbcn і високотемпературної впорядкованої гексагональної фази просторової групи P6322. Показано, що кінетичний перехід описується законом Колмогорова-Джонсона-Мель-Аврамі. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/30972Представлены и проанализированы результаты дифракции нейтронов на образцах VC0.47. Установлены схемы реализации фазовых переходов. Обнаружено существование низкотемпературной ромбической упорядоченной фазы пространственной группы Pbcn и высокотемпературной упорядоченной гексагональной фазы пространственной группы P6322. Показано, что кинетический переход описывается законом Колмогорова-Джонсона-Мель-Аврами. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3097