Thermo-mechanical properties of La2NiO4+δ
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- Huang, B.X., Malzbender, J. & Steinbrech, R.W. J Mater Sci (2011) 46: 4937. doi:10.1007/s10853-011-5406-y
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Elastic and fracture behavior of La2NiO4+δ have been assessed. Fracture stress and elastic modulus of porous La2NiO4+δ were evaluated from room temperature (RT) up to 900 °C on the basis of 4-point bending tests. Both parameters increase slightly from RT to 700 °C. However, at higher temperatures the elastic modulus decreases, whereas the fracture stress increases. In addition, elastic modulus and damping/internal friction of dense specimens were measured by a resonance method. A strong change of elastic modulus and internal friction between RT and 100 °C appears to be related to an orthorhombic-tetragonal phase transition. No indications of phase transition can be observed at higher temperatures. Although thermogravimetric measurements suggest that oxygen was continuously released from the lattice up to 1000 °C with increasing temperature, the thermal expansion coefficient showed a rather stable value from RT up to 1000 °C.