No abstract

We have found that the hybrid organic-inorganic perovskite-like formate Mn(HCOO)(3)[(CH(3))(2)NH(2)] shows a dielectric transition around 190 K. According to single crystal X-ray diffraction, the compound shows rhombohedral symmetry at room temperature and monoclinic symmetry at low temperature (100 K), and the main difference between both structures is that the (CH(3))(2)NH(2)(+) (DMA) cations are disordered in the high temperature phase but cooperatively ordered in the low temperature one. The vibrational spectra of this compound reveal that significant changes take place in the vibrations ascribed to the DMA cation (changes in the frequency of certain vibrations, splitting of particular vibrations, and changes in the intensities), while no significant changes have been observed in those attributed to the formate anion. On the basis of all this information, we attribute the origin of the dielectric transition to the dynamics of the DMA cations: above 190 K these cations can rotate inside the cubooctahedral cavity created by the [Mn(HCOO)(3)](-) framework, while for lower temperatures such rotation gets frozen, and their cooperative arrangement inside the cavities give rise to the observed dielectric transition.

Pluralistic ignorance is a well-documented phenomenon in public opinion research. We adopt the social perspective on pluralistic ignorance and focus on the information environment for an explanation of it. Regarding pluralistic ignorance as a problem of information, we consider its implications in terms of cross-sectional variation as well as over time. The empirical analysis combines a comparative study of issues and analysis over time of gender issues and the question of returning territories for peace in Israeli public opinion.

This paper relies on panel data from Israel to test the spiral of silence the0 y ' s assumptions concerning overt expression of opinion. The research design provides a way to examine the effect of a changing climate of opinion on who speaks up and who silences out over time and changing circumstances. In addition, a multivariateapproach is adopted to test the role of climate perceptions relative to other factors, and extend our understanding of public speech. Perceptions of the climate of opinion are found to be related to overt expression of opinion cross-sectionally; however, their impact is not consistent and weaker than other factors. General political involvement is most important, and also various sociodemographic characteristics of people are more powerful than climate perceptions. Over time this relationship does not hold, and the paper focuses on political discontent and value expression considerations.