sodium niobate, second harmonic generation, nanocrystals, hyperpolarizability, hyper-Rayleigh scattering
photon avalanche, energy-looping, upconversion, trivalent neodymium ions.
NaNbO₃ nanocrystals, Williamson–Hall analysis, Crystallite size and microstrain, Perovskite niobates, X-ray diffraction linewidth analysis, Nonlinear optical materials