As a kind of teaching philosophy, “curriculum ideology and politics” has developed from the “point” exploration from some colleges and universities to the “face” consensus of China's higher education circles. College physics experiment is a compulsory public basic course in science and engineering colleges in China. It contains rich ideological and political elements and has obvious advantages in ideological and political education. Through the construction of ideological and political pattern, the TSTC teaching system was established. This paper systematically studies the construction of teaching team, the design of teaching materials, the training of teachers' ideological and political awareness, and the refinement of ideological and political education content and the exploration and implementation of ideological and political education methods, so as to realize the natural and efficient integration of students' world outlook, outlook on life and values in classroom professional teaching, and achieve the goal of integrating the ideological and political education into students' hearts, minds and bones and the goal of “moral education”.

Double ReO₃-type fluorides have a great interest in the field of negative thermal expansion (NTE) and luminescent materials. However, their application is limited by the scarcity of quantity, expensive raw materials, and harsh preparation conditions. In this work we have found a new NTE material, CaSnF₆, by applying the concept of the average atomic volume. More importantly, different from the previous solid-phase sintering and direct fluorination methods, the nano CaSnF₆ has been synthesized for the first time by solvothermal method. The results of X-ray diffraction (XRD) and Raman spectroscopy show that a phase transition occurs from rhombohedral ( $R\overline{3}$) to cubic ( $Fm\overline{3}m$) structure at about 200 K, and a strong isotropic NTE (α_v = −15.78 × 10⁻⁶ K⁻¹) appears in the cubic phase. Lattice dynamics calculations from first-principles illustrate that the NTE is due to the transverse vibration of fluorine atoms excited by low-frequency phonons. This work not only broadens the NTE family of fluorides, but also provides a new facile and low-cost fabricati on method for the preparation of NTE fluorides.