Electrophysical Properties of Polycrystalline C12A7:e− Electride

Abstract

This article demonstrates the possibility of creating memory devices based on polycrystalline mayenite. In the course of the study, structural characterization (XRD, TEM) of ceramic samples of mayenite was carried out, as well as a study of the spectral (THz range) and electrophysical characteristics. Materials obtained by calcination at high (1360–1450 °C) temperatures in an inert argon atmosphere differ in the degree of substitution of oxygen anions О2− for electrons, as indicated by the data on the unit cell parameters and dielectric constant coefficients in the range of 0.2–1.3 THz, as well as differences in the conducting properties of the samples under study by more than five orders of magnitude, from the state of the dielectric for C12A7:O2− to the conducting (metal-like) material in the state of the C12A7:e− electride. Measurements of the current–voltage characteristics of ceramic C12A7:e− showed the presence of memristive states previously detected by other authors only in the case of single crystals. The study of the stability of switching between states in terms of resistance showed that the values of currents for states with high and low resistance remain constant up to 180 switching cycles, which is two times higher than the known literature data on the stability of similar prototypes of devices. It is shown that such samples can operate in a switch mode with nonlinear resistance in the range of applied voltages from –1.3 to +1.3 V.

Analytical and Technological Research Center “High Technologies & Nanostructured Materials”: History, Formation and Achieved Results

“…Коллективом Лаборатории ФДНС по основообразующему для АТИЦ проекту госзадания в 2020-2022 годах проведены работы в области поиска, роста и характеризации материалов [29] для новых перспективных систем хранения [30] и передачи [31] информации. дифференциация от непроводящего майенита была подтверждена результатами рентгенофазового анализа на рентгеновский порошковом дифрактометре ARL X'TRA производства Thermo Fisher Scientific (Швейцария).…”

“…Работоспособность элемента была экспериментально протестирована во ВКЛ (низкоомное состояние, точки внизу) и ВЫКЛ (высокоомное состояние, точки порядка 1-2 МОм) состояниях вплоть до 190 циклов, но наблюдалось падение сопротивления ВЫКЛ после 110 циклов перезаписи. Тем не менее различия в резистивных состояниях достаточно для хранения информации в элементах памяти [30]. Сотрудниками Лаборатории ФДНС были исследованы структуры, составы и свойства материалов, включая пьезоэлектрические характеристики [32] поликристаллических текстурированных пленок AlN (ПЭМ данной структуры показан на рисунке 5b), полученных методом магнетронного осаждения в высоком вакууме при активном сотрудничестве с Омским научным центром СО РАН.…”

Fabrication and electron emission of [Ca24Al24.08Zr3.92O64]4+(4e−) electrides

“…In recent years, related scholars have conducted research on [Ca 24 Al 24.08 Zr 3.92 O 64 ] 4+ (4e − ) in catalytic reactions and electron emission 1–20 . Some scholars found [Ca 24 Al 24.08 Zr 3.92 O 64 ] 4+ (4e − ) has an extremely low intrinsic work function (∼2.4 eV), and the value is lower than the noble metal Ru (∼4.7 eV) 2,4,34 .…”

“…In summary, the existing fabrication method of [Ca 24 Al 24.08 Zr 3.92 O 64 ] 4+ (4e − ) has complicated steps, a long period, and limited electron density. [7][8][9][10][11][12][13][14][15]21…”

“…), active metal sealing reduction (Ca, Ti, etc.). [7][8][9][10][11][12][13][14][15] These methods require the fabrication of insulated Ca 24 Al 24.08 Zr 3.92 O 66 , followed by electron injection and storage in the insulator through long-term (tens of hours) reduction reactions. 7,9,10 This makes the synthesis of samples cumbersome and time-consuming.…”