caa a22 4500 388021187 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1557/JMR.1998.0030 doi S0884291400042679 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0030 Nanometric powders and sintered ceramics studied by atomic force microscopy [Elektronische Daten] Atomic force microscopy, as well as the Brunauer, Emmett, and Teller technique and x-ray diffraction, was used to analyze ultrafine NiZn ferrite powders hydrothermally synthesized at 200 °C, for 5 h. The particle sizes, measured through AFM images acquired from the surface of pressed powders, were 52 ± 6 nm, which were higher than those obtained by the other techniques. The particles were monodispersed in size and approximately spherical, meeting the requirements for the production of high density sintered components. The observations performed on ceramic bodies sintered at different conditions (1100-1400 °C, 5 to 240 min) showed necks characteristic of the early stages of sintering (1100 °C) and the expected pore curvature evolution (1400 °C) with sintering time in the final stage of the sintering process. Using a straightforward sample preparation technique, AFM proved to be a powerful tool for direct analysis of ceramic powder particles on the nanometric scale and sintered ceramics at different sintering stages. Copyright © Materials Research Society 1998 Dias A. Departamento de Engenharia Metal'urgica e de Materiais, EE-UFMG, Belo Horizonte, MG, 30160-030, Brazil Moreira R. L. Departamentos de Física e Química, ICEx-UFMG, Belo Horizonte, MG, 30123-970, Brazil Mohallem N. D. S. Departamentos de Física e Química, ICEx-UFMG, Belo Horizonte, MG, 30123-970, Brazil Vilela J. M. C. Setor de Tecnologia Metalúrgica-Fundação Centro Tecnolóogico de Minas Gerais-CETEC, Belo Horizonte, MG, 31170-000, Brazil Andrade M. S. Setor de Tecnologia Metalúrgica-Fundação Centro Tecnolóogico de Minas Gerais-CETEC, Belo Horizonte, MG, 31170-000, Brazil Journal of Materials Research Cambridge University Press 13/1(1998-01), 223-227 0884-2914 13:1<223 1998 13 JMR https://doi.org/10.1557/JMR.1998.0030 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0030 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dias A. Departamento de Engenharia Metal'urgica e de Materiais, EE-UFMG, Belo Horizonte, MG, 30160-030, Brazil NATIONALLICENCE 700 1- Moreira R. L. Departamentos de Física e Química, ICEx-UFMG, Belo Horizonte, MG, 30123-970, Brazil NATIONALLICENCE 700 1- Mohallem N. D. S. Departamentos de Física e Química, ICEx-UFMG, Belo Horizonte, MG, 30123-970, Brazil NATIONALLICENCE 700 1- Vilela J. M. C. Setor de Tecnologia Metalúrgica-Fundação Centro Tecnolóogico de Minas Gerais-CETEC, Belo Horizonte, MG, 31170-000, Brazil NATIONALLICENCE 700 1- Andrade M. S. Setor de Tecnologia Metalúrgica-Fundação Centro Tecnolóogico de Minas Gerais-CETEC, Belo Horizonte, MG, 31170-000, Brazil NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/1(1998-01), 223-227 0884-2914 13:1<223 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge