dual nationality, one passport expired

Please help me!
I'm a Brazilian and Portuguese citizen and my husband has British passport and we've been living in UK for more than 10 years. My husband, I and our two children are planing to go to Austria next week but I've just realized that my Portuguese passport and my Portuguese ID have expired and I don't think I'll be able to renew them for next week. Does anyone know if I can travel with my Brazilian passport and my marriage certificate? There is no UK visa in my Brazilian passport.
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