That's what they are saying now:
Full piece @
http://www.bbc.co.uk/news/science-environment-22297915
Earth's core far hotter than thought
New measurements suggest the Earth's inner core is far hotter than prior experiments suggested, putting it at 6,000C - as hot as the Sun's surface.
The solid iron core is actually crystalline, surrounded by liquid.
But the temperature at which that crystal can form had been a subject of long-running debate.
Full piece @
http://www.bbc.co.uk/news/science-environment-22297915