0 Eth transactions after Byzantium

I use geth go 1.7.2 but and when I do transfers they register on the block chain but they're 0 eth.

I use eth.sendTransaction({from: '0x...', to: '0x...', volume: web3.toWei(0.25, "ether")})

Geth prints a hash that ends up on the chain but it's for 0 eth and not the amount I specify. I'm pretty positive this command used to work, is there a change to how the amount should be specified now?
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