Organic Polar Crystals, Second Harmonic Generation, and Piezoelectric Effects from Heteroadamantanes in the Space Group R3m. - Abdur-Rashid K; Saha SK; Mugisha J; Teale S; Wang S; Saber M; Lough AJ; Sargent EH; Fekl U (Chemistry (Weinheim an der Bergstrasse, Germany), 2024)