ZHAO Zifan ^{1, 2}, PENG Zhijian ¹, ZHOU Yanchun ²
(1. School of Engineering and Technology, China University of Geosciences, Beijing 100083; 2. Aerospace Research Institute of Materials and Processing Technology, Beijing 100076)

Abstract: Tetravalent metal pyrophosphates (MP₂O₇, M=Ti, Zr, Hf, Ge, Sn, etc.) are a group of widely used inorganic compounds, drawing extensive attention in the scientific communities. In this paper, the preparation methods of MP₂O₇ materials were summarized with ZrP₂O₇ as an example. The characteristic optical, thermal and electrical properties of MP₂O₇ materials were reviewed, and thus their corresponding applications in the fields of luminescent materials, solid electrolytes, low thermal expansion ceramics and high temperature insulating materials were commented. The prospect for their developments was proposed.
Key words: tetravalent metal pyrophosphate; preparation methods; characteristics; applications