“…In possession of a stereochemically active lone pair and high polarizability, the divalent lead cation contributes to a multitude of high-performance materials ranging from ferroelectrics (e.g., PZT) to nonlinear optical materials. The chemistry of the latter is particularly versatile ranging from hydroxide nitrates , to recently reported fluoride/oxide halides − and halide borates. , In this respect, nitrate is of particular interest being, on the one hand, an isoelectronic analogue of borate, and on the other hand, a crystal chemical analogue of halides . In addition, nitrates do not cause coloring, contrary to halides (particularly in lead oxyiodides), which is important for optical transparency.…”