Defect engineering and micromachining of Lithium Niobate by ion implantation

Kinetics of amorphization induced by swift heavy ions in α-quartz

“…4 we plot the dependence of the Avrami parameters on stopping power S e ; the model's parameters obtained from the fit are also shown in Table 2. The dependence is in accordance with that obtained for other dielectric materials [28][29][30] and confirms a general trend: n > 1 for stopping powers below threshold and decreases down to an asymptotic value, n = l, for high enough stopping powers (S e > S th ) [30]. In other words, one should remark that the exponent n remains above 1 even for stopping powers somewhat higher than the threshold value.…”

“…As for the amorphization kinetics in the electronic excitation regime, it is generally accepted that for low-enough stopping powers it is sigmoidal (Avrami-type), with a null or very small initial slope [27][28][29][30][31]. When the stopping powers are increased above the threshold value for track generation, then the Avrami kinetics turns into a Poisson behavior.…”

Amorphization kinetics under swift heavy ion irradiation: A cumulative overlapping-track approach

“…In other words, below threshold no amorphization should be induced, while above the threshold the model predicts Poissonlike amorphization kinetics as a result of track overlapping. Experimental results [11][12][13][14] on LiNbO 3 show clear evidence of the cumulative behaviour through the observation of an Avrami-like (sigmoidal) kinetics, S ¼ 1 À expfÀð/=/ 0 Þ n g, for the growth of the normalized disordered area S as a function of fluence, for irradiation conditions below as well as above threshold. For irradiations well above threshold the measured Avrami curves correspond to the Poisson limit (n = 1), whereas for conditions below threshold, the Avrami curves present parameters n and / 0 , that steadily increase on decreasing electronic stopping power.…”

“…For irradiations well above threshold the measured Avrami curves correspond to the Poisson limit (n = 1), whereas for conditions below threshold, the Avrami curves present parameters n and / 0 , that steadily increase on decreasing electronic stopping power. The experimental data as collected in a recent paper [13] are shown in Fig. 1.…”

Elastic (stress–strain) halo associated with ion-induced nano-tracks in lithium niobate: role of crystal anisotropy

“…Average information on the lattice distortions caused by multiple-track irradiation can be obtained from highresolution x-ray diffraction experiments [47,51] and RBS/C channelling techniques [2,24,52], although the data cannot usually distinguish between elastic and defective distortions. Regardless, the size of the elastic halo depends on the particular technique used for its detection and its definition is, indeed, a matter of convention.…”