1 resultado para Congressional Member Organizations
em Diposit Digital de la UB - Universidade de Barcelona
Filtro por publicador
- Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España (1)
- Adam Mickiewicz University Repository (3)
- AMS Campus - Alm@DL - Università di Bologna (2)
- AMS Tesi di Dottorato - Alm@DL - Università di Bologna (4)
- Aquatic Commons (13)
- Archive of European Integration (221)
- Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
- Aston University Research Archive (2)
- Biblioteca Digital da Câmara dos Deputados (1)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (4)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (2)
- Biblioteca Digital de la Universidad Católica Argentina (1)
- Biblioteca Digital de Teses e Dissertações Eletrônicas da UERJ (1)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (48)
- Boston University Digital Common (1)
- Brock University, Canada (21)
- Bucknell University Digital Commons - Pensilvania - USA (6)
- Cambridge University Engineering Department Publications Database (18)
- CentAUR: Central Archive University of Reading - UK (36)
- Center for Jewish History Digital Collections (6)
- Chapman University Digital Commons - CA - USA (3)
- Chinese Academy of Sciences Institutional Repositories Grid Portal (15)
- Clark Digital Commons--knowledge; creativity; research; and innovation of Clark University (1)
- Cochin University of Science & Technology (CUSAT), India (2)
- Comissão Econômica para a América Latina e o Caribe (CEPAL) (124)
- CORA - Cork Open Research Archive - University College Cork - Ireland (2)
- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (1)
- Dalarna University College Electronic Archive (2)
- Deakin Research Online - Australia (112)
- Department of Computer Science E-Repository - King's College London, Strand, London (1)
- DI-fusion - The institutional repository of Université Libre de Bruxelles (2)
- Digital Archives@Colby (1)
- Digital Commons - Michigan Tech (2)
- Digital Commons - Montana Tech (6)
- Digital Commons @ Winthrop University (7)
- Digital Commons at Florida International University (3)
- Digital Peer Publishing (5)
- DigitalCommons@The Texas Medical Center (1)
- DigitalCommons@University of Nebraska - Lincoln (3)
- Diposit Digital de la UB - Universidade de Barcelona (1)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (5)
- Helda - Digital Repository of University of Helsinki (14)
- Indian Institute of Science - Bangalore - Índia (9)
- Instituto Politécnico do Porto, Portugal (1)
- Lume - Repositório Digital da Universidade Federal do Rio Grande do Sul (1)
- Massachusetts Institute of Technology (2)
- Ministerio de Cultura, Spain (2)
- Plymouth Marine Science Electronic Archive (PlyMSEA) (3)
- Portal de Revistas Científicas Complutenses - Espanha (2)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (46)
- Queensland University of Technology - ePrints Archive (74)
- ReCiL - Repositório Científico Lusófona - Grupo Lusófona, Portugal (1)
- Repositório Científico do Instituto Politécnico de Lisboa - Portugal (3)
- Repositório digital da Fundação Getúlio Vargas - FGV (17)
- Repositório Digital da UNIVERSIDADE DA MADEIRA - Portugal (3)
- Repositório Institucional da Universidade de Aveiro - Portugal (3)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (20)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (10)
- SAPIENTIA - Universidade do Algarve - Portugal (1)
- School of Medicine, Washington University, United States (4)
- Universidad del Rosario, Colombia (24)
- Universidad Politécnica de Madrid (1)
- Universidade de Lisboa - Repositório Aberto (2)
- Universidade Federal do Pará (1)
- Universitat de Girona, Spain (1)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (1)
- Université de Lausanne, Switzerland (12)
- Université de Montréal, Canada (13)
- University of Michigan (16)
- University of Queensland eSpace - Australia (2)
- University of Southampton, United Kingdom (1)
- University of Washington (2)
- WestminsterResearch - UK (12)
Resumo:
Thermal analysis, powder diffraction, and Raman scattering as a function of the temperature were carried out on K2BeF4. Moreover, the crystal structure was determined at 293 K from powder diffraction. The compound shows a transition from Pna21 to Pnam space group at 921 K with a transition enthalpy of 5 kJ/mol. The transition is assumed to be first order because the compound shows metastability. Structurally and spectroscopically the transition is similar to those observed in (NH4)2SO4, which suggests that the low-temperature phase is ferroelectric. In order to confirm it, the spontaneous polarization has been computed using an ionic model.