Characterization of the E-1 ' center in quartz: Role of aluminum hole centers and oxygen vacancies

摘要

The growth of E-1' centers in a variety of natural and synthetic quartz crystals has been investigated by employing the electron spin resonance technique. It has been reported that the growth of E-1' centers, formed by irradiation and subsequent annealing at 300 degrees C for 15 min, scale with the concentration of the aluminum hole center, AlO4(0), till a limit. Later, the E-1' centers show saturation even when the AlO4(0)-center continues to grow. For quartz with low efficiency of the formation of AlO4(0)-center or irradiated with low accumulated doses, the intensity of E-1' center was small where not all oxygen vacancies are converted to the E-1' center. Thus, besides the availability of a number of oxygen vacancy sites, the number of holes released from the AlO4(0)-center plays an important role in the formation of E1' centers in quartz.